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Chemistry Essay Examples

Chemistry 208 All QUIZ

...The atomic number of an element is equal to the number of protons in the nucleus of its atoms. The mass number is equal to the number of protons and neutrons in the atom. To calculate the number of neutrons, subtract the atomic number from the mass number. Molecules are a combination of atoms in a definite proportion e. g. , molecule of water Ions are charged species formed by loss or gain of electron(s) from an atom. Loss of electron – cation (positively charged) Gain of electron – anion (n...

Organic Chemistry Laboratory - Formal Report

...The study is about distillation. Distillation is a process of converting a liquid to a vapor, and then, collecting the distillate in another container. This technique is used to separate components in a liquid mixture which have different boiling points, or to separate a component that is not volatile. It is one of the methods used when purifying liquids. For example, it is used to concentrate alcoholic beverages. The four distillation methods include simple distillation, fractional distillation...

Organic Chemistry Experiment 4 - Recrystallization

...[1] Acetylation of Aniline using Acetic Anhydride. http://prolabscientific.com/Acetylation-of-Aniline-using-Acetic-Anhydride-p-23917.html. [2] Agency for Toxic Substances & Disease Registry: Toxic Substances Portal – Aniline. http://www.atsdr.cdc.gov/toxfaqs/tf.asp?id=449&tid=79. [3] Bayquen, A. V., Cruz, C. T., de Guia, R. M., Lampa, F. F., Peńa, G. T., Sarile, A. S., & Torres, P. C. (2009). Laboratory Manual in Organic Chemistry. 839 EDSA, South Triangle, Quezon City: C & E ...

Why Should We Study Chemistry

...From what I understood the ingredients that make up the aspirin cause a reaction to reduce clotting factors. I was so intrigued to find all that out and I feel that I can see myself as a doctor. All things considered, like said I think you could agree chemistry is everywhere. I can see myself studying chemistry since it’s a completely necessary. Learning about chemistry is the only way I’ll be able to save a population from a life threatening disease, become a Neurosurgeon, I really see chem...

Lab report chemistry matriculation experiment

...Full Lab ReportExperiment #2:Acid-Base TitrationLab Description: Acid-Base TitrationIntroductionIn this lab exercise we will evaluate the effectiveness. how to do homework over spring break, why should i do my homework now huntsville, an essay on cricket in hindi, harford community college application, mth101 assignment 1 solution 2012, study iridology online australia. laboratory report sample for matriculation. chemistry matriculation 1. In this experiment, you will study the effect of changes...

The Chemistry of Hair Coloring

...My hypothesis was that if I apply hair color to two kinds of synthetic hair, then there will be a better outcome on Sample B. I thought that my hypothesis was right because Sample A is a less expensive type of hair. My hypothesis was rejected because although Sample A was less expensive, it was thicker and could take in more color that Sample B. My results did not support my hypothesis. In the experiment, I learned that coloring hair is strongly related to chemistry. It is related to chemistry b...

"Chemistry" written by Graham Swift

...Throughout the story is the theme of chemistry and how things are "changed - not made". His Grandfather's job, before retirement, was gold-plating and now, in the shed in the garden, he carries out many experiments, "I don't think Grandfather practised chemistry for any particular reason".The chemistry Grandfather experiments with and changes is a metaphor of what is happening in the home, ' "People change too, don't they?" ' His Grandfather replies with "They change. But the element's don't cha...

Chemistry Exam 3 (Atomic Theory)

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Chemistry thermo lab, Hess's Law

...The biggest weakness in this lab was the impurity of the substances, the assumptions that we made about the HCl solution, for example, we assumed that the specific heat capacity of the solution is the same as water, which is an assumption that is not a 100% accurate and affected our ΔH values for both reactions and eventually our final ΔHf value. To fix this, In the different range of specific heat capacity values, 4.10 j/g k would have been more appropriate to get closer to our theoretical va...

Chemistry Research Part 1 Acids

...[2] http://www.coffeehomedirect.com/how/to/clean/a/coffee/maker/with/vinegar [3] http://www.ehow.co.uk/how_7404899_delime-coffee-maker.html [4] http://incarinsurance.org/advantages/advantages-and-disadvantages-of-using-ethanoic-acid-as-a-descaler-.html [5] http://uk.answers.yahoo.com/question/index?qid=20130123013345AA71LkB [6] http://www.p4c.philips.com/cgi-bin/dcbint/cpindex.pl?scy=ZA;slg=ENG;ctn=HD5405/60;dct=FAQ;refnr=0092154;view=aa12_view_partial.html;session=20120502004843_66.249.71.242;f...

Role of Chemistry in Our Society

...It has played a major role in pharmaceutical advances, forensic science, and modern agriculture. The simple fact is that chemistry plays an important role in human’s life from the moment we’re born. It usually begins from the first thing each morning. Most people wake up to an alarm or radio. These common household items contain batteries, which make them very chemically dependent. These batteries contain positive and negative electrodes which is also all about chemistry. It also plays an im...

Chemistry Lab Experiment: The Flame Test

...Name a possible source of experiment error and suggest at least one way to reduce the effect: A possible experimental error that could have effect the result is contamination of metal salts. As directed in the steps you must clean the wire using hydrochloric acid. By doing this you are removing any traces of the previous metal salts that could alter the true colour of the flame produce by a different metal salt. By reusing the same wire at each metal salt, you could reduce the effect. Each wire ...

Chemistry Gcse Coursework Rates of Reaction

...My results were outstanding seen as though I had no outliers or the error bars on my graph are very small. The line of best fit shows a natural trend between the solution and the average time taken. But taken into consideration the time taken to record the results was not 100% accurate. This problem would have been avoided if I used more accurate equipment. Taken as a whole I can see that my experiment went very well. I am very confident with my results and I can feel that my investigation was v...

How has chemistry made your life better?

...Almost forever people have used chemistry to create amazing materials. A long time ago early chemists would create iron from iron ore by heating the ore with carbon. Chemistry has not only helped to develop iron, but it has also played major roles in developing many different mixtures of metals and other materials. Plastic today plays a huge part in our lives and was developed with the use of chemistry! Plastics have incredible properties and characteristics which include being light weight and...

The Importance of Chemistry in Daily Life

...systems are vitally dependent on chemistry. Without chemistry something as simple as scrubbing a toilet without fear of severe burns or small explosions might not be possible. Next, though it isn’t widely known, chemistry is also heavily involved with the manufacturing of things such as makeup and soap. Each time you bathe you are witnessing chemistry at work. Chemicals such as cetyl alcohol and propylene glycol are typical ingredients in the soap used to wash your hair and skin. Without chemi...

Pharmaceutical Science and My Interest in Chemistry

...My education at Saradavilas College of pharmacy is filled with great competence. The undergraduate Courses of the pharmacy curriculum have given me a comprehensive exposure to all the core fields and it helped me not only in building a strong foundation of the fundamentals but also in developing an overall perspective about the myriad fields involved like inorganic chemistry, medicinal chemistry, organic chemistry, biochemistry, pharmaceutics, pharmacology, pharmaceutical analysis and natural Pr...

Chemistry IA: Electrolysis of Metal Sulphate solutions

...Electrolysis is the chemical decomposition of a compound by applying an electric current through a solution containing ions. Electrolytes are required to conduct electricity. They must be dissolved in water or in molten state for the electrolytes to conduct because then, the ions are free to move allowing the solution to be electrolyzed.[1] In electrolysis, reduction happens at the cathode whilst oxidation happens at the anode. Reduction is the loss of electrons and oxidation is the gain of elec...

The Role of Geology in Influencing Water Chemistry

...The chemistry of lakes, rivers, oceans, and stream water in many regions is strongly associated with the character and circulation of geologic materials in the watershed. For example, the dominance of glacial till and granitic gneiss rock in the North and East of Big Moose Lake region results in a geologically sensitive terrain distinguished by low alkalinity and chemical compositions of the surface water with only slightly modified from ambient precipitation. On the contrary, widespread deposit...

Chemistry Investigation to find the Empirical Formula of Magnesium Oxide

...The hypothesis of this investigation was that the mass of magnesium after combustion could be used to calculate the empirical formula of magnesium oxide and it has been established that the hypothesis is supported. Throughout the processing of data many results were removed die to the lack of validity. Thus, the data collected provided inaccurate results. When represented in Graph 1 the result did not was not equivalent to the theoretical ratio of 1 : 1. Nevertheless, when displayed in Table 6 t...

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