Science Essays
4,476 Science Free Papers: 781 - 810
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Chemical Equilibrium
CHEMICAL EQUILIBRIUM Reversible reactions and dynamic equilibrium Ammonia (NH3) is an important industrial chemical that is used in the manufacture of fertilisers. It is manufactured by reacting hydrogen with nitrogen. The reaction is said to be reversible and the conversion of reactants to products is never complete. N2 + 3H2
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Chemical Reactions
Purpose: To understand how single displacement and double displacement theories apply to real life situations. Procedure: See Pg. 244-245. Observations: Experiment Results a)sodium chloride + silver nitrate milky/blue/white later turned gray b)silver nitrate + potassium iodide white/yellow(clear well) blue/green(black well) c)iron(III) chloride + sodium hydroxide Apple Juice Yellow d)sodium
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Chemical Reactions - Sodium Hydroxide
Chemical Reactions- Sodium Hydroxide A chemical reaction is a change where two or more substances are changed into a new substance. You can identify a chemical reaction by colour change, effervescence (bubbles), when light or heat given off, and the change is usually irreversible. There are 6 main types of
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Chemical Reactions of Copper Compounds
Chemical Reaction of copper compounds Introduction: In this experiment, the objective was to conduct a series of chemical reactions that contain copper or copper compounds. That is to say that the products of each chemical reaction were used in the next reaction. The process starts with a solid copper wire
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Chemical Structures
ACD/ChemSketch Version 6.0 for Microsoft Windows User's Guide Drawing Chemical Structures and Graphical Images Win!!! See contest details inside. Advanced Chemistry Development Inc. Copyright © 1994-2002 Advanced Chemistry Development Inc. All rights reserved. ACD/Labs is a trademark of Advanced Chemistry Development Inc. Microsoft is a registered trademark and Windows
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Chemical Warfare
Luke Corrigan Per. 2 Chemical warfare What is Chemical Warfare: To understand chemical warfare you must first understand what a chemical agent is. A United Nations report from 1969 defines chemical warfare agents as " ... chemical substances, whether gaseous, liquid or solid, which might be employed because of their
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Chemical Waste
Clean Up Of Chemical Waste Chemical spills are major problems that haunt the environment. Strict government regulation are trying help this problem, but governmental leaders face many challenges. Disposal of harmful chemicals is often difficult and costly. Since chemical waste has destroyed the environment, steps are being taken to
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Chemicals
A chemical substance is a material with a definite chemical composition. It is a concept that became firmly established in the late eighteenth century after work by the chemist Joseph Proust on the composition of some pure chemical compounds such as basic copper carbonate.[1] He deduced that: "All samples of
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Chemicals Found Everywhere
Hidden Dangers Everyday humans are exposed to toxic chemicals and the majority of these people are unaware of the fact. Until viewing websites with regard to chemicals in our society, I too was unaware of how often an individual comes into contact with these toxins. There were three sites
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Chemistry
Lab Report Title: The Concept and Measurement of Density Purpose: To gain an understanding of the physical property of density. To gain skill in measurement of mass and volume, in addition to the construction of graphs and the physical interpretation of slope. Procedure: Part 1 Regular solids 1. Use the
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Chemistry
Question: What is the solubility curve of KNO3 Prediction: Draw a sketch to show the shape of the curve you expect for the solubility of a typical solid dissolving in water at different temperatures. Plot solubility on the y-axis and temperature on the x-axis. Materials: Large test tube Balance Stirring
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Chemistry
When I was sixteen years old I was going through teen peer pressure of trying to fit in with the people in high school. Well, one hot summer day I decide to relax and color my own hair without my mother's permission. I went to B-Plus hair designs and purchased
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Chemistry
Plan This investigation is about rates of reaction and what affects them. In this case I am going to look at hydrochloric acid and sodium thiosulphate which is a precipitation reaction. They react as in the equations below: Sodium thiosulphate + hydrochloric acid -> sodium chloride + sulphur +
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Chemistry
Patrick Curtin May 21, 2006 Chemistry Chapter 20 o Hydrocarbons= are composed of only carbon and hydrogen; they are the simplest organic compounds. o Isomers= Compounds that have the same molecular formula but different structures. o Structural formula= indicates the number and types of atoms present in a molecule and
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Chemistry
The original distinction between organic and inorganic chemistry arose as chemists gradually realized that compounds of biological origin were quite different in their general properties from those of mineral origin; organic chemistry was defined as the study of substances produced by living organisms. However, when it was discovered in the
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Chemistry
In this Experiment, we used Hydrochloric Acid and Magnesium to make Hydrogen. The whole purpose was to make it and test it. So once we put the magnesium in the test tube filled with hydrochloric acid, a chemical reaction took place. As the magnesium was dissolving the acid was warming
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Chemistry (history of Salt)
History of- "Evidence" shows sodium chloride was** important as long ago as when supposedly, mastodons were on the earth. Sodium chloride was being used before written history began. 2,700 years B.C there was published in China the Peng-Tzao-Kan-Mu, probably the earliest known pharmaceutical guide. (Sodium) A major part of this
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Chemistry and America
When reading through the May 22, 2006 issue of Chemical & Engineering News, I found that a significant percentage of the articles shared and discussed the latest happenings with companies in the industry. While they may have mentioned a new drug they were developing or a new breakthrough just recently
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Chemistry Basics
Summer assignment! Chemistry-study of the composition structure and properties of matter and changes it undergoes Chemical-any substance that has a definite composition Atom - smallest unit of an element that maintains properties of that element Change of state-physical change of a substance from one state to another Chemical change-a change
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Chemistry Coursework - the Dissappearing Cross
CHEMISTRY COURSEWORK- "THE DISSAPPEARING CROSS" PLANNING Background Information: During a chemical reaction the reacting particles must collide with each other, however, collision alone does not guarantee that the reaction will start. Reaction will only occur if the colliding particles have sufficient combined energy to get over the energy barrier between
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Chemistry in the Development of Synthetic Gemstones
Synthetic Gemstones Throughout history, gemstones have been reserved mainly for royalty and families who were very wealthy. People who could not afford them often sought ways to have the things that they desired. The practice of imitating jewels and gemstones has been around almost as long as they have been
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Chemistry Independent Study
Chemistry Independent Study: Gas Laws Gas Laws Since the days of Aristotle, all substances have been classified into one of three physical states. A substance having a fixed volume and shape is a solid. A substance, which has a fixed volume but not a fixed shape, is a liquid; liquids
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Chemistry Lab Filtering Technique
Objective: The purpose of the lab is to learn filtering techniques. Specifically, to form and filter a calcium carbonate precipitate using a Buchner funnel. Procedure: a.) Prepared a mixture of .5 M calcium nitrate (45 mL) and .01 M sodium carbonate by combining and stirring the two liquids in a
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Chemistry Lab Measurement and Uncertainty
I.PURPOSE OF EXPERIMENT The purpose of this lab was to determine the magnitude of the uncertainties produced when making measurements using common lab equipment. II.APPARATUS AND MATERIALS NEEDED safety goggles distilled water (at 20oC) laboratory apron dropper laboratory balance 2 objects of unknown mass standard masses graduated cylinder, 10-mL graduated
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Chemistry Metals Report
Chemistry (Research Task) Gather, process, analyse and present information from secondary source on the rage of alloys produced and the reasons for the production and use of these alloys Metals have been used all throughout history- from stone age to our modern developed society. Metals are naturally obtained from metal
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Chemistry of Acids and Bases
CHEMISTRY 122 CHAPTER 17 NOTES CHAPTER 17 EXERCISES (THESE ARE NOT TO BE TURNED IN, BUT QUIZ QUESTIONS WILL BE TAKEN FROM THESE EXERCISES SO IT IS TO YOUR BENEFIT TO DO THEM): 2, 3, 5, 6, 8, 10, 13, 15, 16, 18, 19, 21, 23, 25, 27, 28, 29,
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Chemistry of Crime Scene Investigation
Chemistry of Crime Scene Investigation Burn Baby Burn (Arson experiment) Question #1 PURE: 1,2,4,5,9,13,14,18,19,20 MIXTURES: 3,6,7,8,10,11,12,15,16,17, Question #2 DID NOT HAVE THE TWO GASOLINE EXAMPLES IN THE PACKET PRINTED. INFORMATION NOT PRESENT. Question #3 Our group decided that we wanted to find out if foam changed the burning rate and
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Chemistry of the Stratosphere
here are several techniques used to investigate the chemistry of the stratosphere. The first of these is monitoring which involves analysing the air using spectroscopy. Given that ozone absorbs in the infra-red and ultra-violet regions of the spectrum, the concentration on ozone in a sample can be calculated form the
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Chemistry Open Paper
Chemistry Coursework In Polymerisation the term 'addition polymerisation' is when there are small unsaturated starting molecules which are called monomers and they join together to form a long saturated polymer that has a double bond this is called a 'free radical' eg: A + A + A + A
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Chemistry Planning and Designing Lab
Lab# Date: Topic: The reactivity series Problem: Which of the following metals are more reactive with acids - magnesium, zinc, aluminum, iron, lead, and copper? Hypothesis: Aluminum is the most reactive with acids because it occurs in group III. Aim: To perform a comparative test on which metal is the
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