Chemistry Essays Examples For College & High School Students in PDF

1489 total results

A Biology Lab Report on the Properties of the Amylase Enzyme (855 words, 2 pages)

Biology Lab ReportTitle Examining Some Properties of the Enzyme -amylaseIntroduction In this experiment a deeper meaning in the catalysts of reactions is studied. Catalysts accelerate chemical reactions without permanently changing the reaction. Enzymes, catalysts in biochemical reactions, are globular proteins which lower the activation energy needed to begin a reaction ... Read More

A Biography of the Life and Achievements of Chemist Sir Humphry Davy (411 words, 1 pages)

Sir Humphry DavyIn Chemistry there are many very important chemists. One is Sir Humphry Davy. Davy was born on December 17, 1778 in Penzance, Cornwall, England. He went to school in Penzance and in Truro. In 1794 his father died, to help his family financially he got a job as ... Read More

A Report on an Experiment to Determine the Effects of the Concentration of Sugar in Water on the Quantity of Water Which Goes into a Potato Chip (819 words, 4 pages)

PlanIn my experiment, I plan to find out whether the concentration of sugar in water affects how much water will go in to a potato chip. I will do this by having twelve test tubes three with one molar of sugar solution, three with molar sugar solution, three with molar ... Read More

Understanding the History and Nature of Chemical Reactions (392 words, 2 pages)

CHEMICAL REACTIONSChemical reactions are the heart of chemistry. People have always known that they exist. The Ancient Greeks were the first to speculate on the composition of matter. They thought that it was possible that individual particles made up matter. Later, in the Seventeenth Century, a German chemist named George ... Read More

The Scientific Life of Melvin Calvin from Minnesota 1911-1997 (291 words, 1 pages)

Melvin Calvin was born in St. Paul, Minnesota, April 8, 1911, of Russian emigrant parents. He received the B.S. degree in Chemistry in 1931 at the Michigan College of Mining and Technology, and the Ph.D. degree in Chemistry from the University of Minnesota in 1935. He spent the academic years ... Read More

A Chemical Analysis of the Substance Mercury and a Short History (418 words, 1 pages)

Mercurys symbol is Hg, its atomic number is 80, its atomic mass is 200.59, its in group 12 and in period 6, and it also has two valence electrons. Its standard state is liquid at 298K and it is the heaviest known elemental liquid. It has a silvery white color. ... Read More

A Biography of Arthur Kornberg an American Biochemist and Physician (2524 words, 4 pages)

Never Met A Dull EnzymeA. Personal InformationArthur Kornberg (1918-), American biochemist and physician, claims he has never met a dull enzyme. He has devoted his life to pursuing and purifying these critical protein molecules. His love of science did not spring from a family history rooted in science. He was ... Read More

Characteristics of Mercury (489 words, 1 pages)

MercuryAtomic Number 80Latin hydrargyrum liquid silverAtomic Symbol HgAtomic Weight 200.59Mercury is the only common metal that is a free-flowing liquid at room temperature. It is slightly volatile in room temperature and becomes solid when subjected to a pressure of 7640 atmospheres. The metal dissolves in nitric or concentrated sulfuric acid. ... Read More

Instruction Manual. The Purification Process: Recrystallization & Filtration (2265 words, 7 pages)

Instruction ManualThe purification processRecrystallization FiltrationJason Williams09-13-00NATS 4310Table of ContentsPrefaceChapter 1 Equipment involved and preparationGlassware and accessoriesProper sterilization of equipmentSafety precautionsChapter 2 Setup procedure before purificationEquipment setupChoosing of solventChapter 3 Gathering of an unknown compound and the first step filtrationCollectionFiltrationRepeat Filtration and CleaningCollection and measuring of crude sampleChapter 4 Recrystallization processSolvent ... Read More

A Chemical Analysis of the Manganese Element Discovered in 1774 (243 words, 1 pages)

Hi, I am Manganese. I am an element discovered in 1774 by the Swedish chemist Johan Gottlieb Gahn. My symbol was devised, coincidentally, by taking the first and third letters in the word manganese. My atomic number is 25, my atomic mass is 54.938, and my density is 7.2. I ... Read More

The Metallic Properties of the Group 5A on the Periodic Table (1300 words, 3 pages)

Place In Periodic TablePhosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi) form a group of four elements in Group 5A of the periodic table. They exhibit increasing metallic properties going down the group. Nitrogen (N), which heads the group, is a colorless, odorless, and tasteless gas. Phosphorus is a ... Read More

The Interview of Jennifer Wong, a Scientist of Analytic Chemistry (1930 words, 4 pages)

The InterviewFor my interview, I interviewed Jennifer Wong, a scientist in the development of analytic chemistry. In her occupation she purifies and analyzes proteins, as well as characterizes the proteins. She works for Panox located at 10301 Stellink Houston, TX 77025. For this company Dr. Wong analyzes proteins in order ... Read More

An Experiment of Copper Metal in Concentrated Nitric Acid (534 words, 1 pages)

3 Cu 8 HNO3 -- 3 Cu (NO3)2 2 NO 4 H2OThe balanced equation seen on the top is what you attain when you place copper metal in concentrated nitric acid. In this process the identifiable characteristics of the metal will be completely changed and a new substance, cupric nitrate, ... Read More

An Introduction to the Hardest Material Compounds Known to Man (2421 words, 5 pages)

The unique nature of diamond is heavily dependent upon its composition, crystal structure, and mechanical, thermal, and electromagnetic properties.1 Of those dependencies, composition exacts the most influence over the characteristics. Crystal structure is the repeating pattern of diamonds composition, and each of the properties are the result of molecular interaction ... Read More

Using Charles Law to Determine Absolute Zero (777 words, 3 pages)

Using Charles Law To Determine Absolute ZeroTuesday 7th of DecemberIntroductionOne of the variables that affects the volume of a gas is the temperature of the gas and its surroundings. This volume-temperature relationship is quantified in Charless law. The law states that as the temperature of a gas decreases, the volume ... Read More

An Experiment: The Influence of Concentration of the Substrate Hydrogen on the Enzyme Catalase (2864 words, 6 pages)

INTRODUCTIONThe enzyme catalase speeds up the decomposition of Hydrogen Peroxide into water and oxygen as shown here, 2H2O2-------------------2H2OO2.It is one of the fastest known enzymes and its turnover number is 6 million, which means the number of substrate molecules which one molecule of the enzyme turns to products per minute. ... Read More

The Role of Carbon Dioxide in Combustion (2296 words, 4 pages)

COMBUSTIOn carbon DioxideResearchBy Rabon Hutcherson II.Combustion and carbon dioxide, what are they? When people think of combustion they probably think of simple just bursting into flames and for carbon dioxide you probably think of what we breath out and what plants take from the air and turn to oxygen. Even ... Read More

A Report from an Experiment on Carbohydrates (806 words, 2 pages)

Carbohydrates are present in sugars, starch, acids, and in many other nutrients that consist elements of carbon, hydrogen, and oxygen. Having a ratio of 1 2 1 or written as CH20. A monosaccharide meaning monomer of sugar is a "simple" carbohydrate. Containing backbone of five carbon atoms that are present ... Read More

An Examination of Substances into Acids and Bases (348 words, 2 pages)

What substances turned into Acids? What substances turned into Bases?Hypothesis Procedure Pour about three milliliters of your sample in each of three test tubes. Pour the same amount on a watch glass. In the first test tube put in two drops of methyl orange and record the color. In the ... Read More

Characteristics of Clacium (227 words, 1 pages)

Calcium Element symbol...CA Atomic weight...40.08Element number...20 Number of protons...20Number of electrons...20Number of neutrons...20Density at...68? F Boiling point...2,264?FMelting point...1,562?FCalcium was discovered by Sir Humphrey Davis in 1808. Calcium is a mineral found in abundance in the Earths outer crust. It is the fifth most abundant mineral in the Earth crust. Calcium ... Read More

How Isotopes Are Used by Biologists (1105 words, 5 pages)

CHP 2 ATOMS, MOLECULES AND BONDSDefine element, atom, compound, molecule, and trace element.ELEMENT a substance that cannot be broken down to other substances by chemical reactions. COMPOUND a substance consisting of two or more elements combined in a fixed ratio.MOLECULE two or more atoms held together by covalent bondsTRACE ELEMENTS ... Read More

The Separation of Various Materials of Water, Sand and Salt (423 words, 4 pages)

92700Chemistry Lab Physical Separation LabPurposeThe purpose of this lab was to try different methods to physically separate various materials. The variables for this lab were the evaporation of the water andor the loss of sand or salt. My hypothesis for this lab was that the sand could be filtered out ... Read More

An Introduction to Organic and Biological Compounds and Its Importance (319 words, 3 pages)

Chapter 13 Organic and Biological CompoundsI.Simple Organic CompoundsA. Organic Compounds1.Most compounds that contain the element carbon are organiccompounds.Ie More than 90 of all compounds are organic compounds.2.The word organic comes from the word organism.Ie At one time, scientists assumed that only living organisms could produce organic compounds.B. Hydrocarbons1.The chemical formula ... Read More

The Importance of Marie Curie’s Input in Science (1041 words, 2 pages)

Why was Marie Curie a significant woman in European Science? Marie Curie was the most successful scientist to come out of Poland. She saw science as a beauty that she wanted to withhold. Science to her was an unknown fairy tale phenomena that she was determined to discover. Marie Curie ... Read More

Description of TCE and Its Uses (436 words, 2 pages)

is TCE?TCE is a nonflammable liquid it is colorless. It has a sweet odor and a sweet burning taste. TCE does not occur naturally in the environment. It is an artificial compound. It is produced synthetically from 1,2-dichloroethane. And stabilizers are added to the marketed product. What is TCE used ... Read More

An Introduction to the Atomic Bomb Research in the United States, The Manhattan Project (1646 words, 2 pages)

Thesis The research for the first Atomic bomb was done in the United States, by a group of the best scientists this research was given the name of The Manhattan Project. On Monday July 16th, 1945, a countdown for the detonation of the first atomic bomb took place near Los ... Read More

An Introduction to the Current Trends, Scale and Likely Future Sources of Carbon Monoxide and Sulphur (1000 words, 4 pages)

1. Identify current trends, scale and likely future sources of carbon monoxide, sulphurdioxide, nitrogen dioxide, lead, particles and photochemical oxidants.....AGA notes that considerable background material is already available on this issue including the State of the Environment Report and other processes being developed through the NEPC. It is important that ... Read More

How to Successfully Separate the Substance in the Sludge and Knwoning Its Characteristics Properties (683 words, 3 pages)

I. Title Chapter 5 Lab TestII. Purpose To successfully separate the substances in the "sludge" and to identify their characteristic properties.III. Methods and Materials A. safety goggles, matches, alcohol burnerburner stand, test tubes w rubber stoppers, thermometer, pegboard, water, bucket, rubber band, calculator, sludge, rock salt, moth flakes, porcelain chips, ... Read More

The Role of Meyer and Mendeleyev’s in Creating the Periodic Table (608 words, 1 pages)

Things are different from each other, and each can be reduced to very small parts of itself. - Ancient knowledge This was noticed early by people, and Greek thinkers, about 400BC, used the words "element', and atom' to describe the differences and smallest parts of matter. These ideas survived for ... Read More

The Natural Form and Composition of Hydrogen (639 words, 2 pages)

Hydrogen, symbol H, is reactive, colorless, odorless, and tasteless gaseous element. The atomic number of hydrogen is 1. The element is usually classed in group 1 of the periodic table. Hydrogen was confused with other gases until the a British chemist demonstrated in 1766 that it was evolved by the ... Read More

Chemistry Essay Examples