Eutectic Definition and Examples

A eutectic system is a homogeneous, solid mixture of two or more substances that form a super-lattice; the mixture either melts or solidifies at a lower temperature than the melting point of any of the individual substances. The phrase most commonly refers to a mixture of alloys. A eutectic system only forms when there is a specific ratio between the components. The word comes from the Greek words eu, meaning good or well and tecsis, meaning melting. Examples of Eutectic Systems Several examples of eutectic systems or eutectoids exist, in metallurgy and in various other fields. These mixtures typically have useful properties that are not possessed by any single constituent substance: Sodium chloride and water form a eutectoid when the mixture is 23.3% salt by mass with a eutectic point at -21.2 degrees Celsius. The system is used to make ice cream and to melt ice and snow.The eutectic point of the mixture of ethanol and water is nearly pure ethanol. The value means there is a maximum proof or purity of alcohol that can be obtained using distillation.Eutectic alloys are often used for soldering. A typical composition is 63% tin and 37% lead by mass.Eutectoid glassy metals exhibit extreme corrosion resistance and strength.Inkjet printer ink is a eutectic mixture, permitting printing at a relatively low temperature.Galinstan is a liquid metal alloy (composed of gallium, indium, and tin) used as a low-toxicity replacement for mercury. Related Terms Concepts and terms related to eutectic systems include: Eutectoid: Eutectoid refers to a homogeneous solid mixture that forms from cooling two or more melted metals to a certain temperature.Eutectic Temperature or Eutectic Point: The eutectic temperature is the lowest possible melting temperature for all of the mixing ratios of the component substances in a eutectoid. At this temperature, the super-lattice will release all of its components and the eutectic system will melt into a liquid as a whole. Contrast this with a non-eutectic mixture, in which each component will solidify into a lattice at its own specific temperature until the whole material eventually becomes solid.Eutectic Alloy: A eutectic alloy is an alloy formed from two or more components that exhibits eutectic behavior. A eutectic alloy melts at a distinct temperature. Not all binary alloys form eutectic alloys. For example, gold-silver does not form a eutectoid, as the valence electrons are not compatible with super-lattice formation.Eutectic Percentage Ratio: This is defi ned as the relative composition of the components of a eutectic mixture. The composition, particularly for binary mixtures, is often shown on a phase diagram.Hypoeutectic and Hypereutectic: These terms apply to compositions that could form a eutectoid, but do not have the appropriate ratio of component substances. A hypoeutectic system has a smaller percentage of ÃŽ ² and a greater percentage of ÃŽ ± than a eutectic composition, while a hypereutectic system has a greater percentage of ÃŽ ± and a lower percentage of ÃŽ ² than a eutectic composition.

Parenting Styles And Their Influence On Children - 798 Words

Parenting styles have a direct correlation to how a parent interacts with their child and how their child interacts with them. Diana Baumrind was a developmental psychologist that came up with four basic parenting styles that influence how children behave throughout their life (Kopko,2007). The parenting styles consist of authoritarian, authoritative, permissive and uninvolved. An authoritarian style is characterized when a parent barely shows warmth to their child and has desires to control their child’s actions (Kopko, 2007). These types of parents tend to not give their children a reason for why they are telling them something other than the fact that they have the power to do so. Overtime, children of parents that practice an authoritarian parenting style may value their parents’ wishes over their own. This is a dynamic that is present because, the parent affirms the child’s worth through praising them for staying in the confines of their discipline. The main weakness of this is the child may experience guilt when their wants no longer align with their parents. They may feel like they have to choose between pleasing their parent and their happiness. This parenting style may affect the childs social development in the respect they may feel they do not have the freedom to experience certain life events. Also, they may feel limitied to only hanging out with people that their parent pre-approve of. Similar to authoritarian is authoritative parents that are warm and firmShow MoreRelatedParenting Styles And Their Influence On Children995 Words   |  4 PagesParenting Styles Today, being a parent is obviously challenging in several different directions. Every parent has different opinions on how they believe they should parent and punish their children. Parenting styles can be described as the way in which a family is structured. There are four major parenting styles that are all used today. The four styles include authoritarian, authoritative, permissive, and uninvolved parenting. Each one of these styles have their advantages and disadvantages. EvenRead MoreParenting Styles And Their Influence On Children951 Words   |  4 Pages In this day in age there are various approaches to raising children. Each parent(s) must decide for them selves which style best fits their beliefs and abilities. Many parents come to the conclusion that they will try their best and just hope that their children learn right from wrong and the abilities they need to succeed in life. However, what most parents do not always realize is that the style of parenting they are using may have a bigger impact on their child than they are aware of. For theRead MoreParenting Styles And Their Influence On Children1264 Words   |  6 Pageschild or children does not mean you have the fundamentals of being a good parent. Raising children you should be ready to teach, construct develop have conformity in the home and nature skills into your child so they are ready for society and the world in their near future. When parenting a child there are serval ways to raise children. Many parents prefer different methods over others. Some parenting styles are use more than others and are much favorable than others. Different parenting styles bringRead MoreParenting Styles And Their Influences On Our Children Essay2140 Words   |  9 PagesParenting Styles and Their Influences on Our Children The Community College of Philadelphia By: Maria Maldonado November 22nd, 2016â€Æ' The Introduction Thesis- It is my belief that in order to provide a framework of parenting that would allow for the best probable outcome for a child’s development it is important to take a stance in which we provide reasonable demands from our children while providing equal responsiveness to their needs. Majority of us are born with two arms, two legs, a head andRead MoreAttachment Theory and Parenting Style Influence on Children Essay1185 Words   |  5 PagesHow the child is raised and the parenting style used is a significant influence on that development by affecting the relationship between parent and child. This supports the Attachment theory in which emphasizes relationship between the child and caregiver as a key factor in development. My Caregiver’s Parenting Style My parents, my father specifically, believed that children should obey their elders without question and without hesitation. This outlook on parenting stems from their cultural backgroundRead MoreHow Parenting Styles Influence Children s Learning And Development1976 Words   |  8 PagesAs we have discovered, children are active learners from birth and parents are seen as children’s first educators. â€Å"Children of all ages need encouragement, adequate nutrition, shelter, parental interest in their schooling, and consistency in rules and expectations† (Barnes, 2006; Mental Health America, 2009, in Lamanna, Reidmann and Stewart, 2014:230) this should be in correspondence to the child’s age or development level. This chapter is going to explore theory from Baumrind to discover how differentRead MoreConsequences to Authoritarian Parenting 868 Words   |  4 Pagesadolescence offers the prospect to influence the child regularly. Parenting styles figures in as a prime part of a child’s mental health and behaviour. Parenting refers to the parent’s actions and reactions to their child, including expectations, beliefs and values. Diana Baumrind (1971, 1991), psychologist, based parenting on two aspects including control and warmth. Baumrind used the combination of these aspects in different ways to identify the four styles of parenting used today, consisted of, authoritativeRead MoreThe Fbi Behavior Analysis Unit1443 Words   |  6 PagesKarley Pecosky Psychology Parenting Styles The FBI Behavior Analysis Unit can profile a person down to the type of household they grew up in. Behavior as an adult, especially of a psychopath, is usually in correlation to a traumatic event of their childhood, usually involving their parents. The FBI has the ability to analyze all the behaviors of a person and tell you what kind of car they are mostly likely to drive, what profession they are most likely involved in, and in most cases, links toRead MoreDevelopment Of Infancy And Early Childhood1385 Words   |  6 Pagesdevelopment that occur during this time set the stage upon which further and more specific aspects of development will occur. There are many different external and internal components which influence and guide development during this time. These components include the individual’s family, including more specific parenting styles, as well as early education and the individual’s social environment. Each of these various aspects of development plays a critical and widespread role in these initial stages of developmentRead MoreEssay on Infancy and Early Childhood Development1654 Words   |  7 Pagesinteraction. Development begins during the prenatal period on up to the early years and depends on the nutritional, medical, emotional, and intellectual support of parents, family members, caregivers, and teachers (Cherry, 2011). Parenting styles also play a role in what influences development as well as early childhood education programs. During the prenatal period when a child’s development begins, thus being aware of many factors that can damage the fetus and the development of a healthy child. In

Rewards in Martial Arts Essay Example For Students

Rewards in Martial Arts Essay For me, Tang So Do is a way f elite because can express treaty my thoughts and emotions by performing techniques and forms, whilst helping me in my daily life, was only nine years old when first enrolled into a Tang So Do lesson. At that age, was so young to understand and appreciate what martial arts is about In fact, had the concept that Tang So Do was a sport where could show my abilities and strength to beat someone. Obviously as I grew up and moved on to higher belts, realized I had the wrong mentality. Eventually I kicked off to show more interest and dedication and made my own research about the art, then darted to have a better understanding. This helps me to show more respect to my art and to my instructor, Mr.. Ian Wallace, and to my mates. Now, that am almost eighteen years Of age, I have better knowledge Of and appreciation in Tang Do. Still there are other concepts that Will have to bring to light and understand. Focus is the primal thing in a persons life. Without Focus one cannot achieve anything in life. Therefore once a person concentrates hard in what he is doing, he will have a goal and a success will follow. The person has to keep focusing until he achieves what task he wants to complete. One must always find a balance in life. When one is talking about self confidence, its not just about self confidence but self-esteem, First and foremost it is important to point out that the level of self-esteem may range from high to low, yet these factors are sometimes taken to extremes. Usually someone who has very low self-esteem is said to have a major interiorly complex, where a person degrades his personality and suffers from self-humiliation. On the contrary, those with a superiority complex; those people who have a high self-esteem, are more likely to take pride n what they do, but this can eventually lead to arrogance_ Generally there is a link between these two extremes, where those who have the ability of believing in themselves to the full influence those with a weaker character. This could lead the individual into a depressive mood which eventually lead him to commit suicide as he comes to believe that this is the only form Of escapism. In both cases, there is the problem of socializing; both might have difficulties regarding integrating With society. Those Who feel useless would form a fatalistic approach here they deprive themselves from society and any social activities and recreation. These can also be identified as introverts. On the Other hand, the individuals with high superiority complex may find hard to integrate in society as they might reject any views which differ from their own. One cannot mix a high self-esteem with over confidence or egoism because these are as negative intentions. High self-esteem is a positive thing as one gets inner peace and also has the confidence to keep on searching and to do what one really wants in ones life and pushes oneself to go for it. From my experience, can say that Tang So Do has given me this self-confidence and inner peace. Focus, balance and discipline are the strongholds of martial arts. Tang So Do encourages the student to overcome fears, to prepare to succeed and to invite a full life of adventure, One recognizes that the best way to overcome fear is to confront it. One must be present in body, mind and spirit in order to learn. Personally, believe that Respect is one of the most important guidelines in order to hue success in life because it is one of the most essential values in life. As I eave already mentioned, encounter different people from different societies in my daily life and need to give them the required respect. Everyone is unique in ones own way; whether its ones appearance, character, politics, beliefs, abilities or skin color. Theres a saying that NO man is an island and I totally agree With it. This is because no one can live ones whole life on his own to be a complete person. Everyone is dependent on someone else (Whether it can be a relative, a friend. A neighbor, etc. ), and for this reason everyone has to be respected for ones ability. Therefore, respect is like a two-way deal, if a person respects others, then the person will in the long run receive the same respect from others. Moreover, think that if there is respect, then Obedience will follow. This is because the person must be obedient with himself and to others in such a way, that together with his education, he can have a better idea of the values in elite. An Analysis of Heart of Darkness EssayWill power is the inner power that overcomes the desire to indulge in unnecessary and unless habits, and the inner strength that overcomes inner emotional resistance for taking action. Will power is the ability to arrive to a decision and follow it with perseverance until successful accomplishment. The same applies during Tang so DO because sometimes it seems that it is impossible to get a technique or something. However. I believe that If you aim for something, you can get it because along with perseverance and will power anally I will get what want for good or for worse! Dedication is like the cherry on the cake. This is because it combines with all the other values: Respect, Obedience, Discipline, Responsibility, and Perseverance and Will Power. Believe that dedication is one of the ingredients to have success in elite. However it goes along with commitment because it depends on how much a person is committed and this shows in his abilities. Also, it he is self-disciplined, there is more chance that he would be more dedicated and determined in what he believes in. All these values in my life could not have been possible if I had not the love ND care from my parents and my superiors; being in school, sport or in Tang So Do. Have had Mr.. Ian Wallace as my instructor from the beginning of my training. To him owe my perseverance and will power. He taught me that first have to belief in myself in order to excel in my life Mm Wallace is a very dedicated person, always there to encourage us students, pinpointing our good moves and stressing on values. His commitment and dedication to Tang So Do, his behavior in class and outside have taught us excellent knowledge of the significances in life. Besides being our Instructor, he is also our friend, and that sakes a big difference. Self-improvement does not just happen. It is not a gift. Tang So Do sees, embraces and endorses the highest standards of behavior. Much of what society offers neither stirs the spirit nor maintains good mental or physical health. Tang So Do encourages the push to excel and the drive to a positive position in life. I try to get to know myself. Began to see my interior nature. Work through impatience and frustration. Hard training and persevering showed me the way. Myself esteem strengthens me and helps me to achieve one difficult task after another and to clear obstacles that comes in my way. Tart to feel good and motivated in my efforts when I apply my new skills. As said, Tang So Do is a way of life because can deliver freely my aggressiveness, anger, passion and confidence through forms and techniques. Also, Tang So Do helps me to build a strong and determined character because have a better understanding of the values of Respect and Obedience, Discipline, Responsibility, Perseverance and Will Power. These tenants all sure me as a guidance in my everyday life. All the above is helping me in my I am at the moment a second year student in Junior College, preparing myself for my A Levels. Also, a long term injury did not hindered me to keep pushing myself to the limits. Perseverance, Dedication and Discipline are pushing me to work hard during this grueling year. The study Of martial arts instills in the individual the belief that the stirring for excellence and the patience to strive is the greatest value of all. Such study encourages me to be the best I can be in every aspect Of my life. In a world where many people seem to embrace a complacent attitude of just getting by, insist on lengthening my limits, making a meaningful life of myself and those around me, and balancing the basic aspects of my nature. Believe that f know what is expected of me, will hold a meritorious goal, and set out to achieve that goal in an environment of discipline, direction and devotion to duty, Achievement, excellence and honor will then follow as a natural reward.

The Role of Management

Preface The subject of interest in this report is the responsibility of management in health and safety with reference to the UAE industries. United Arab Emirates (UAE) has expanded industrially and economically especially in the airline, construction, maritime, and petroleum sectors. Mass recruitment and utilization of laborers both high-skilled and low-skilled from developing countries has provided satisfaction to the manpower demands of these rapidly growing economic and industrial sectors. (Speegle, 2012)Advertising We will write a custom essay sample on The Role of Management specifically for you for only $16.05 $11/page Learn More This enormous recruitment has led to changes in population demographics. The total UAE population is approximately 8.2 million, with about 940,000 being Emiratis while the rest are multinational immigrant workers. These unique factors pose a number of challenges to the health and safety of workers. As a result, there is a high mortality rate. This paper purposes to illustrate the role management plays in reducing the risk of dangers associated with the UAE industries. It outlines and emphasizes the activities managers should carry out to minimize such risks. Safety is a crucial requisite in any industry. Every firm should establish a safety section in charge of all incidents and accidents. In addition, the report establishes the role of safety plans and health safety equipment programs in minimizing the risk of hazards in the UAE companies. This is to identify the missing links in management and poor managerial practices that give way to these hazards. The paper also tries to provide directions in the effort to minimize these problems. (Taylor, 2005) Introduction The UEA is a rapidly growing state both in population and economy. It consists of a federation of 7 emirates (Dubai, Abu Dhabi, Fujairah, Ajman, Sharjah, Ras Al Khaimah, and Umm al-Quwain). These are situated towards the southeast part of t he Arabian Peninsula. Despite being a new state in the Middle East, UEA it has witnessed remarkable economic growth in the last 40 years, particularly in the airline, maritime, petroleum, and construction industries. Mass recruitment and utilization of laborers both high-skilled and low-skilled from developing countries has provided satisfaction to the manpower demands of these rapidly growing economic and industrial sectors. They possess varying academic qualifications, religious beliefs, work experience, native languages, and cultural practices. This mass employment has a tremendous effect on the population demographic patterns. Consequently, its population has increased largely since the year 1971. (Institute of Leadership Management, 2012)Advertising Looking for essay on business economics? Let's see if we can help you! Get your first paper with 15% OFF Learn More Problem description Occupational injuries as a cause of morbidity and mortality in UEA Injury is amo ng the leading causes of mortality in the UAE cutting across all groups of people. Studies reveal that occupational associated deaths attributed to about 16% of all injury related fatalities in Abu Dhabi in the year 2007. Further, research studies suggest that the number of mortalities related to occupations injuries is rising. The 2007 Health Authority Abu Dhabi annual report reveals that 22% of all injuries are as a result of occupational injuries. Factors leading to increase in mortality rate due to occupational illness The rise of fatalities due to occupational injuries is alarming in the UAE industries. This has prompted the need to look into the underlying cause of these life threatening incidences. There are three major factors contributing to the rising number of work related deaths. These include:- 1. Lack of awareness of the occupational associated hazards e.g. Construction sites or chemical industries. 2. Inadequate training of the workers on the occupational hazards and how to avoid them. 3. Poorly established safety measures in working areas as a result of poor management. (Lawrence B. Cahill, 2010) The role of management in minimizing risks associated with occupations For safety purposes, every industry should have a safety manager who ensures that all processes and operations work in an effective and safe manner. The safety manager also makes sure that all the staff members are conversant with the laid down operational regulations and safety rules of the company.Advertising We will write a custom essay sample on The Role of Management specifically for you for only $16.05 $11/page Learn More Operational role The safety manager is responsible for guiding the workers on the principles of safe operational procedures. In addition, they are also responsible for conducting investigations on the arising accidents and how to avoid them in the future. Supervisory responsibility The manager ensures that workers carry out all t he operations and activities of a company in a manner that conforms to the Work safety-and Health administration rules and guidelines. The manager is the overall overseer of all activities in the industry. Risk assessment The manager should assess the type and frequency of occurrence of the risks associated with the workplace. This assists in projecting the amount of resources to be put in place for any cases that may arise. The manager may achieve this by identifying the most common hazards, identifying the people at risk, evaluating the common risks, and establishing ways of tackling them. (Taylor, 2005) Role of safety plans and health safety equipment programs Safety plans are crucial in ensuring a safe working environment hence reducing mortality cases. A safety plan is an outline of approaches prepared by the safety manager. It addresses the laid down recommendations on how to handle injuries and minimize risks causing them. A well-organized and planned safety plan helps in red ucing fatalities resulting from occupational injuries. Safety equipment programs are responsible for ensuring that all the equipment used in an industry conforms to the standard safety and health specifications. They help reduce the number of accidents related to poor equipment. (Lawrence B. Cahill, 2010) Implementations The government of UAE has established laws and acts, and programs to promote safety in working areas. These help promote safety awareness in industries. They include: 1. The Federal Labor Law and AmendsAdvertising Looking for essay on business economics? Let's see if we can help you! Get your first paper with 15% OFF Learn More 2. The Height Aware Campaign 3. The Heat aware Campaign Conclusion Expatriate workers just like other employees; import their attitudes, beliefs, ideas, and experiences into the occupational areas. The incidence of occupational linked injuries in the UAE is alarming. Partly, it is due to recruitment of many expatriate workers for the rapidly developing industrial and construction projects. These have hence outpaced the capacity of health, labor, and education ministries to implement enough health and safety training and awareness programs. Safety and Health practitioners responsible for training of multinational workers should give special considerations to immigrant workers by developing a safety and health training and information program. (Speegle, 2012) This study was a quite a challenge as it encountered many shortcomings. Integrating information from all governmental departments and agencies dealing with safety management was quite involving. This report is simply an overview that needs further investigation. There is still need to research on this project since it is a leading crisis in UAE. Further studies should be conducted on how to minimize morbidity and mortality rates arising from the occupational injuries. Also, more research should be done to establish the best programs to be implemented. References Institute of Leadership Management, J. J. (2012). Managing Lawfully – Health, Safety and Environment Super Series. Oxfordshire, London: Routledge. Lawrence B. Cahill, R. W. (2010). Environmental Health and Safety Audits. Lanham, Maryland: Government Institutes. Speegle, M. (2012). Safety, Health, and Environmental Concepts for the Process Industry. Clifton Park, New York: Cengage Learning. Taylor, B. (2005). Effective Environmental, Health, and Safety Management Using the Team Approach. Hoboken, New Jersey: John Wiley Sons. This essay on The Role of Management was written and submitted by user Kyndal Y. to help you with your own studies. You are free to use it for research and reference purposes in order to write your own paper; however, you must cite it accordingly. You can donate your paper here.

Marijuana Effects on Human Forgetting Functions an Example of the Topic Health Essays by

Marijuana Effects on Human Forgetting Functions This study investigates and tries to determine which of the individual components of memory are altered by marijuana. It has long been established that acute marijuana use impairs working memory of humans and animals. The previous studies focused on how marijuana affected memory on global terms like word recall, digit recall and paired associate word memory. By employing the delayed matching-to-sample method, the researchers attempted to distinguish whether acute marijuana smoking altered the delay-dependent and delay-independent components of memory. The study is a first in this field and with the use of human subjects; a similar research was carried out using pigeons and a cholinergic drug. Need essay sample on "Marijuana Effects on Human Forgetting Functions" topic? We will write a custom essay sample specifically for you Proceed The experiment was carried out with seven subjects but two were dropped from the experiment as they did not meet the requirements of the study. The subjects were recruited thru newspaper advertisement and were adequately compensated for their participation in the study. The subjects were identified as occasional marijuana users and used one more drug in the past. They were required to not use any other drug during the duration of the experiment as checked by a daily urine analysis. This was necessary to rule out any potential interaction with the marijuana and other drug which may affect the results of the experiment. The apparatus and materials used in the study consisted of a chamber made of plexiglass for the smoking administration. Subjects were directed to smoke marijuana in predetermined sequence. The subject had an ashtray, a pair of tweezers for smoking and subjects were connected to an oscillometric blood pressure and pulse monitor and a carbon monoxide indicator. The subject was cued by a computer monitor as to the smoking protocol. For the experimental test sessions, the subject worked in a chamber alone with a VGA monitor and mouse. The experimental events and data collection was recorded by remote software. The subject had two sessions for the experiment, the smoking and the experimental testing with the DMTS tasks. For the behavioral testing procedure, subjects were seated in the designed chamber. A detailed instruction was read to them and they were to work with the VGA monitor and mouse. The software recorded all the responses of the subject in the delayed match-to-sample tasks as well as controlled the sequence and schedule of the tasks. For the marijuana smoking, subjects smoked a placebo, a low dose and a high dose cigarette. Subjects were instructed to smoke, hold their breath, inhale or exhale in different sequences and timing. The number of inhalation and dose was monitored till subjects reached the state of acute marijuana intoxication. Doses were given in ascending order with intervening placebo after each high and low dose. After smoking marijuana subjects were asked to answer a self-report cardiovascular measure that was composed of subjective effects of marijuana. The results of the experiment showed that the acute administration of smoked marijuana to adult humans produced changes in rates of forgetting but not in initial discriminability. The study found evidence that the impairments were due to the delay interval length of tasks. It was observed that the intoxication of marijuana increased the rate of forgetting functions in all subjects. With the DMTS procedure, the researcher was able to determine the mechanism at which marijuana affected memory performance. The findings of the study shed light on how marijuana affects the cannabinoid receptors in the hippocampus giving evidence that the hippocampus indeed play a major role in memory functions. Moreover, this study helped identify the different components of human memory that are affected by the drug, thus using marijuana in some medical conditions may not be the bets option as it compromises the memory functioning of the patient. Lastly, the study showed that biological and behavioral aspects interact in memory processes, thus cognitive abilities can be impaired by prolonged marijuana use. This study as an experiment using human subjects and using a potentially harmful substance has some ethical issues. Considering that subjects volunteered for the experiment but the advertisement as a behavioral research was misleading. Although subjects had prior experience in smoking marijuana, the potential hazard of exposing the subjects to acute marijuana smoking within the six week period carries far greater threat than the objectives of the study. The experiment though had sophisticated apparatus and materials and was innovative in using the delayed-dependent and delayed-independent measures but it is not clear on how they did this. Reference Lane, S., Cherek, D., Lieving, L. 1 pp 67-83

Law of Constant Composition Lab Essay Essays

Law of Constant Composition Lab Essay Essays Law of Constant Composition Lab Essay Paper Law of Constant Composition Lab Essay Paper Purpose: To find the per centum Mg by mass in Mg oxide and to detect if the per centum composing is changeless by comparing category consequences. Hypothesis/Prediction: The per centum composing by mass of Mg in Mg oxide will non alter significantly with each group that conducted the experiment. The composing of each substance should remain the same and any differences must be due to some mistake. Materials: Magnesium stripCrucibleCrucible coverClay triangleIron ringRetort standTongsBalanceBunsen burnerProcedure:1. obtained a strip of Mg between 30-40 centimeter long2. coiled Mg strip into a tight roll3. measured the mass of the crucible and cover4. Added the Mg strip to the crucible and measured the Mg. crucible and cover together. 5. Partially covered the crucible with the screen and heated it utilizing a Bunsen burner until the Mg ignited. 6. Turned off Bunsen burner. 7. waited for burning to proceed8. when the reaction appeared completed. heated the melting pot once more for another five minutes9. allowed crucible to chill for 10 minutes10. measured the mass of the crucible. screen and magnesium oxideObservations: When ignited. the Mg strip gave off a bright visible radiation. There was a color alteration on the Mg. It started out as Ag and turned into a white coloring material. The burning gave off a distinguishable smell. The terminal consequence was a white pulverization but some Mg had been left in its original form. Harmonizing to the theory of J. L. Proust. a compound ever has the same per centum composing no affair how it is prepared. For all three of our ain single groups tests. we obtained the same per centum composing and this satisfies Prousts theory. This is besides accurate with what we have read in the text edition Chemistry 11 on the Law of Definite Proportions on pages 147 150. 2. What decision can you do upon the category consequences? The decisions I can do based upon the category consequences are that the composing of a compound must change because everyone had a different reply. In most instances. the per centum composing of Mg in the compound was really different from what my group achieved. However. sometimes. the categories consequences were rather similar to my ain. The theory that C. M. Berthollet introduced about the composing of a compound was that a compound has an infinite figure of composings depending on the proportions of the constituents that were used in its readying. His theory satisfies the consequences obtained from the whole category. Since every group had a different sum of Mg they must besides hold had a different composing of Mg in the compound formed. Mg oxide. However. this is inconsistent with what we have been taught and with what is written in the text edition. Since the text edition is a more dependable beginning of information. I must reason that the ground for this difference in consequences may be attributed to error on the portion of the pupils carry oning the experiment. 3. Which Gallic Scientist would you be given to back up? Explain. The Gallic scientist that I support is J. L. Proust. I agree with Marcel prousts theory because I believe that if the composing of a substance were to alter. so would its belongingss. An obvious illustration of this is one stated in the text edition: H2O and H peroxide. The simple add-on of a H atom to the compound of H2O can do a liquid that is indispensable to life go lifelessly. Since I know that the per centum composing of a peculiar substance is the same no affair where. how or when it is made. I must hold with J. L Proust and back up his theory. Beginnings of ErrorOne ground why a pupil may hold obtained a higher per centum of Mg than the remainder of the category is: during the experiment. mass must hold been lost. This could hold been done in many ways. Often. the Mg took excessively long to light and pupils began to set it directly into the fire to light it and so put it back into the crucible. Sometimes. the Mg wilted and small pieces of it broke off. In add-on. the Mg would sometimes light and so snuff out itself. In the changeless remotion of the Mg from the crucible. mass was lost in the signifier of ashes. When mass is lost during the experiment. the entire mass of the compound is lower and when the mass of Mg was divided by the entire mass. yielded a higher per centum of Mg. One ground why a pupil may hold obtained a lower per centum of Mg than the remainder of the category is: the Mg did non decently combust. In many instances. the Mg would snuff out itself and would non fire wholly. This resulted in some white pulverization. ash. and some Mg still in the same form that it was when we began the experiment. This suggests that it did non fire with the remainder of the Mg thread and hence. did non organize the compound with O. This would give in a higher entire mass than what it should hold been and when the mass of Mg is divided by the entire mass. would give a lower per centum. The undermentioned computation shows the existent per centum of Magnesium in the compound Mg oxide. Molar mass of MgO = 24. 3 + 16. 0= 40. 3For 1. 00 mol of MgO: % Mg = 24. 3 / 40. 3 ten 100= 60. 3 % Therefore. the existent per centum value of Mg in MgO is 60 % The undermentioned computation shows the per centum mistake for my ain groups result % mistake = ( experimental accepted ) / accepted ten 100= ( 72 60 ) / 60 ten 100= 20 % Therefore the per centum mistake for my group was 20 % . ConclusionBased on the informations collected by each group. the composing of a substance must alter depending on the proportions of the constituents that were used in its readying. However. as explained earlier. the text edition and the belongingss of affair province otherwise. Scientifically. if the composing of a compound was to alter. so would its belongingss. The consequences obtained by the category are rather the antonym of what has already been proven by Proust to be true and hence. I believe that the grounds obtained by our chemical science category is the consequence of many errors and can non be used to convey the thought of the Law of Constant Composition which states that the composing of a specific compound is changeless.

Media writing - Feature Story (media newspaper or magazine) Essay

Media writing - Feature Story (media newspaper or magazine) - Essay Example Modernising the dating domain as we recognise it, these Internet sanctuaries are reconstructing the boundaries of love and the search of love, from all over the world. â€Å"We’re trying to reach the whole world—people of all spiritual orientations, all political philosophies, all racial background,† (Kornblum 2005: para 10) declares Neil Clark Warren, originator of one of the largest on-line dating sites in the world, eHarmony.com. So how does on-line dating works? She met him on the Internet, his screen name was Gizzy. He only knew her by his first name, Sarah. They have not met each other personally. But they immediately knew that they are destined for each other, merely by communicating through the Internet. â€Å"We always have a lively conversation and I miss it every time,† reveals Michael Thompson, 43, a retail store manager who met his soul mate through an on-line chat room. â€Å"I always feel that she is very close to me every time we chat. When I heard her voice for the first time I promised to myself that I will do everything to make her mine.† Seattle supermall saleslady Sarah Martin spent the whole night chatting on-line, from 7 p.m. to 12 a.m. They then decided to call each other on their mobile phones. The couple talked throughout the rest of the next morning exchanging funny and embarrassing stories about each other. Sarah decided to give her address to Michael, and the latter was in Sarah’s doorstep the next day. One month later, the couple got married. â€Å"I enjoyed talking to him on the phone, and I really loved his humour,† says Sarah, a 35-year-old who works as a saleslady for a supermall in Seattle. â€Å"It’s funny but we started talking about our future together. Then he asked me if I am ready to settle down. I said ‘Of course, why not!’ Then we finally got married after a month. It was a very solemn wedding†. While it is seldom for a man and a woman who have not met each other face-to-face, and who are not aware of each