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Chemistry Essay Examples

Chemistry

...At room temperature, ILs are basically salts with heavy phosphorous or nitrogenous organic rich organic cations with a linear skeleton or chain of alkyl groups. Extensive research has been invested mainly in the imidazolium ILs especially the cations of 1-alkyl-3-methylimidazolium. The structures of these cations have also been studied extensively. ILs are known to be of dual functionality since they have both the cations and the anions. The most common anions of ILs include, the nitrates such a...

Food Chemistry

...Water activity involves the amount of water available, or susceptible to chemical and biological reactions within a food product. The amount of water activity present can determine the likelihood that bacterial growth and spoilage will develop within food materials. Chemistry methods work to reduce the amount of water contained in a material, or else counter its effects within a food product. Food quality, consumer satisfaction and government requirements are all factors taken into account when ...

Nano Chemistry

...Indeed, bulk materials can be remodeled through bottom-up synthetic chemistry and top-down engineering physics strategies as nanomaterials in two main ways, the first by reducing one or more of their physical dimensions to the nanoscale and the second by providing them with nanoscale porosity. When talking about finely divided and porous forms of nanostructured matter, it is found that ‘‘nanomaterials characteristically exhibits physical and chemical properties different from the bulk as a c...

Food Chemistry

...Water activity involves the amount of water available, or susceptible to chemical and biological reactions within a food product. The amount of water activity present can determine the likelihood that bacterial growth and spoilage will develop within food materials. Chemistry methods work to reduce the amount of water contained in a material, or else counter its effects within a food product. Food quality, consumer satisfaction and government requirements are ll factors taken into account when d...

Chemistry-Precipitation

...According to the back of the periodic table it states that if the anion iodine is part of the compound then cations like Ag+, Pb2+, Hg22+, and Cu+ will form a solid with it. Therefore, since copper is listed as one of the cations that iodine forms a solid with, a solid would be formed which is exactly what happened when sodium iodide was added to copper (II) nitrate. Since sodium iodide in combination with copper (II) nitrate was the only combination to form a dark yellow/orange color of all 4 a...

Green Chemistry

...Application software: MS Office, MS excel MS access & PowerPoint. * Proficiency in handling various computing software and packages including effective usage of Pub Med, Medline, Sci Finder and other research search engines. STRENGTHS * Strong Academic Orientation * Organized, Systematic & Always looking for Perfection in my work HOBBIES * Surfing the net as a means for exchanging thoughts and views and with the aim of networking. * Watching movies & playing chess REFEREN...

Chemistry Stpm

...To make cloth/sleeping bags, etc 2M ( b ) ( i ) K: functional group : -OH isomers : CH3CH2CH2OH and CH3CHCH3OH arm isomers separately with alkaline iodine, CH3CHCH3OH gives a yellow precipitate but CH3CH2CH2OH does not. CH3CH2CH2OH + 4I2 + 6OH– CHI3 + 5I– + 5H2O + CH3COO– 5M (ii ) L : functional group : ? C = O | Isomers : CH3CH2CHO and CH3COCH3 warm isomers separately with Tollen’s reagent. CH3CH2CHO gives a silver mirror but CH3COCH3 does not. CH3CH2CHO + 2[Ag(NH3)2]2+ + OH– CH3CH2CO...

Chemistry Questionnaire

...The dissociation reactions and Ka values of carbonic acid are given below. H2CO3 HCO3- + H+ Ka1 = 4. 2 x 10-7 mol dm-3 HCO3- CO32 - + H+ Ka2 = 4. 8 x 10-11 mol dm-3 0. 10 mol dm-3 aqueous NaOH is added slowly to 20. 0 cm3 of carbonic acid and the change in pH is followed and shown below. pH x x B x A x x 10 20 30 40 10 Vol of aqueous NaOH added / cm3 (i) Calculate the initial pH of the carbonic acid, stating any assumptions you make. (ii) Calculate the pH at the first equivalence point, A. (iii)...

Chemistry practice skills

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Alchemy vs Chemistry

...This idea was known as transmutation, and the main goal of it is to transfer ordinary metal into gold. Aristotle did not have a proof for his theory However, because he was trusted and respected this idea has been for 2000 years even though they were wrong, and still until now there are some people who believe in alchemy and alchemists still exist. Some people think that chemistry and alchemy are the same, but they are different in many ways. First of all, alchemy rely a lot on the spiritual con...

Chemistry Form 4

...CARBON STEEL| 99% IRON1% CARBON| HARDSTRONG| * FRAMEWORK OF BUILDINGS & BRIDGES * FRAMEWORK OF HEAVY MACHINERY & BODY OF VEHICLES| STAINLESS STEEL| 74% IRON18% CHROMIUM8% NICKEL| SHINYSTRONGRESIST RUSTING| * MAKING CUTTLERY & KITCHEN WARE| MAGNALIUM| 70% ALUMINIUM30% MAGNESIUM| LIGHTHARDSTRONG| * MAKING AIRCRAFTS| PEWTER| 97% TIN3% COPPER, ANTIMONY| LUSTROUSSTRONG| * MAKING MUGS, CANDLE STICK & SOUVENIERS| SOLDER| 50% TIN50% LEAD| HARDSHINYLOW MELTING POINT| * MAKING OF SOLDER FO...

Importance Of Chemistry

...Chemistry is also important for the environment. When you are aware of the harming effects of the gases like carbon dioxide and methane as a result of the greenhouse effect, you can easily carve out solutions for the reduction of effects on the environment. If you go with a minimum knowledge of the importance use of chemistry you can help in saving the environment to a large extent. Though chemistry is thought as complicated and a boring science subject, chemistry is responsible in explaining th...

Honors lab Chemistry

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Chemistry and Biotechnology

...From the experiment, several conclusions could be made. First, the sodium fusion tests consist of various tests, which determine the presence of nitrogen, sulfur and halogens in an organic compound. The presence of nitrogen was confirmed by the formation of a Prussian blue precipitate or solution. The presence of sulfur was confirmed through the formation of the black precipitate PbS or the formation of a deep violet solution from sodium nitroprusside. The presence of a halogen in the compound w...

Chemistry of Chocolate

...The result is a homogeneous, paste-like mixture which is already pleasant to taste, but still feels gritty to the palate. The chocolate is put in a conching machine. While in the machine, the chocolate turns over in the conching machine, a controlled amount of air ventilates the mass, allowing the full aroma and flavor to develop. The still-warm conched chocolate is placed in a tempering machine so that it can be slowly and steadily cooled. The tempering prevents separation in the chocolate when...

Cooking Is Chemistry

...For instance, you may could a bloody burger but if you think, the cells and everything within the erythrocyte do not disappear. They are just simply destroyed and no longer living. The blood cells hop of the pan or fly away. Cooking is chemistry without chemistry; most of today’s food would not exist. If you don’t mix the right amount of grams of one element with another the product can result in being a different food . Chemistry allows foods to diverse, creating an ample amount of new ingr...

Chemistry Soya Milk

...Thus a good yield of curd can be obtained with soy milk. And moreover soy yogurt helps in controlling type 2 diabetes and high blood pressure. The enzymes in the soy yogurt also help in regulating blood sugar levels. Thus soy milk is a suitable replacement of cow milk to meet the demands of the ever increasing population. INDEX Why I chose this project? 1 Soya bean milk 1 Soy yogurt 4 Nutrition and Health Information 7 Chemistry involved 9 Requirements 10 Procedure 11 Observations 12 Result 13 I...

Chemistry Energy Levels

...Divides the shells into smaller groups called subshells * n determines the values of l * for any given n, l may range from l=0 to l=n-1 * identifies the shape of the orbital Value of l| 0| 1| 2| 3| Letter designation| s(shape)| p(principle)| d(diffuse)| f(fundamental)| Magnetic quantum number (ml): * splits the subshells into individual orbits * identifies the orientation of the orbital * for any given value of l, ml has a value ranging from +l to –l * e. g. If l=0, ml=0; for l=1, ml=+1, 0, -1...

Chemistry and Computers

...In the emerging field of nano-science and nano-technologies it is important for scientists to be able to control the structure and bonding of molecules that are used in creating small scale electronic components for products such as computers. Scientists have succeeded in imaging and forming a unique bond between a single gold atom and a single organic molecule called a pentacene. They managed to bind the atom to the pentacene and take images of rearrangements of the electrons participating in t...

Chemistry In Daily Life

...Advertising, Africa, Agriculture, Animals, Antarctica, Anthropology, Antique, Applied Sciences, Archaeology, Architecture, Aromatherapy, Artificial Intelligence, Arts, Asia, Astrology, Astronomy, Australia, Aviation, Backpacking, Beauty, Biographies, Biology, Bird Flu, Books, Cheerleading, Chemistry, Children, Cities, Climate, Communication, Cooking, Countries, Business, Cars, Celebrities, Culture, Dancing, Demographics, Design, Drinks, Ecology, Economics, Education, Engineering, Entertainment, ...

History of organic chemistry

...Now since this class I’ve been observing just how this filter system works. I have discovered that the residue that remains after filtering in some way affected the taste of my regular tap water. I have since learned that this residue consists of salt and other stuff that could definitely dramatically affect the test. Interestingly enough though, this filtration process didn’t start with me. Scientist years ago began to filter water for health reasons. Elements that are deadly to our human b...

Magnesium Oxide Chemistry Report

...An experiment was performed to calculate the empirical formula of magnesium oxide by comparing the masses of solid magnesium metal to the magnesium oxide solid product in a crucible. The concept of stoichiometry mole equation leads to finding the empirical formula of magnesium oxide. One major finding during the experiment was that burning magnesium caused its mass to increase as it reacted to oxygen. The amount of mass increase is proportional and able to be calculated through weighing the mass...

A World Without Chemistry

...That’s the chemical name for aspirin, the cheap wonder-drug which has given us relief from headaches and fever as well as helping to prevent strokes and heart attacks. And what would us poor, pimply teenagers do without this wonderous chemical to fight all our spots? All I can say is, THANK YOU CHEMISTRY! Chemistry plays a big role in every aspect of our lives. It has allowed other sciences to blossom and has expanded our collective knowledge. We understand how the tiniest components of the hu...

Chemistry uncertainty conical flask

...The effect of these small errors on the result can be eliminated by carrying out more rounds of the experiment, or by repeating with different electronic balances. Further investigation could be done on finding the values of uncertainty of different sizes and grades of conical flasks. By repeating the experiment with different sizes and grades of conical flasks, we can gain understanding in different instruments and the result might be used as reference in future experiments involving conical fl...

The chemistry of shampoo

...As is evident in the project, there are many ingredients involved in the making of shampoo. Each shampoo contains different ingredients, which react in different ways. Modern technology, and scientific studies are allowing for studies to find shampoos that are healthier for the hair and scalp. Maybe one day a product will be available of little machines that attach to hair and stay there all day helping it fight oil, grease, dirt, and dryness. Can this one-day be a reality? Maybe, but one thing ...

Science Investigatory Project (Chemistry)

...Juices of Mangifera indica, Annona muricata, and Citrofortunella microcarpa completed fermentation at different dates. Mangifera indica completed fermentation last at 13 days, while Annona muricata at 10 days, and Citrofortunella microcarpa, the fastest, at only 3 days. The researchers deemed this difference in fermentation rate a result of the apparent amount of fructose, which are broken down by the yeast cells, in the fruits where the juices came from as can easily be induced from the sweetn...

Introduction to Organic Chemistry

...Some errors like human errors might have affected the results in yielding a pure azo compound. One human error, would be the measuring of the reagents used to yield the said product. Also, the misreading of some measurements may have also affected the results of this experiment. Also, some impurities in the chemicals used will also not be ignore, since this impurities may have led to a not so visible side reactions in the said experiment. After being said and done, all the said objectives in thi...

Food Chemistry Options Report

...In conclusion, food chemistry involves a large amount of organic and chemical structure knowledge in order to maintain and improve upon the food production and processing techniques that are already out there. Much more thought is often put into food chemistry then most people would think which shows why it is often not known or understood by the common person. However, as food development and preservation becomes even more prominent in our society today, common food chemistry knowledge should b...

Chemistry IA design format

...If two of the same substance have different masses it means there is more of the one substance. In a mass of a substance there is a certain amount of material that can be reacted. By increasing mass the amount of substance that may be reacted increases. Therefore if mass increased the amount that of substance reacted will increase as well providing there is enough of the reactant. This will in turn increase the energy change. Also if more of the substance reacts with the reactant more of the rea...

Chemistry class xii project

...Humidity Control:- Rust can be avoided by controlling the moisture in the atmosphere. An example of this is the use of silica gel packets to control humidity in equipment shipped by sea. Metal Coupling:-Len this method, the iron is coupled with other metal and if the metal is above iron in electrochemical series(meaner more electrostatics)then in the galvanic cell is formed by the contact of the iron and that metal, iron will go under reduction it will be safe from rusting. If the metal is below...

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