Science
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4,610 Essays on Science. Documents 841 - 870
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Chemical Composition of Cells Lab
Chemical Composition of Cells Lab Purpose: Proteins: State the monomer for a protein and explain how the monomer joins to form a protein as well as identify proteins and peptides and explain the function of enzymes. Carbohydrates: State the monomer for starch and distinguish maltose starch and site the test used for identifying starch and sugar as well as describe the varied results of the Benedict’s test. Lipids: State the components of a fat and
Rating:Essay Length: 2,245 Words / 9 PagesSubmitted: January 18, 2018 -
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 2NH3 A reversible reaction is a reaction which can take place in either direction When the concentrations of the reactants and product have become constant,
Rating:Essay Length: 1,172 Words / 5 PagesSubmitted: December 21, 2009 -
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 chloride + potassium nitrate No visible change e)sodium carbonate + calcium chloride Turned Milky Conclusion: Analysis a-e) See table under Observations. g) Evidence was shown
Rating:Essay Length: 279 Words / 2 PagesSubmitted: November 16, 2009 -
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 chemical reactions- combustion (often called burning), synthesis, decomposition, neutralization, single replacement and double replacement. A combustion reaction is a reaction with oxygen, and heat is
Rating:Essay Length: 1,449 Words / 6 PagesSubmitted: November 27, 2009 -
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 dissolved in nitric acid and the end product is copper powder. The product which was used from the previous reaction is the limiting. In the
Rating:Essay Length: 746 Words / 3 PagesSubmitted: November 22, 2009 -
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 is a trademark of Microsoft Corporation. PDF, Acrobat and Portable Document Formats and associated data structures and operators are copyright (c) Adobe Corporation. IBM is
Rating:Essay Length: 263 Words / 2 PagesSubmitted: March 12, 2010 -
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 direct toxic effects on man, animals and plants ... ". This means basically that any chemical that is used to directly effect and harm a
Rating:Essay Length: 1,146 Words / 5 PagesSubmitted: November 13, 2009 -
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 a compound have the same composition; that is, all samples have the same proportions, by mass, of the elements present in the compound". This became
Rating:Essay Length: 1,406 Words / 6 PagesSubmitted: February 12, 2010 -
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 that were explored and they were quite informational. The first website Banned Elsewhere, Compounds Still Used in U.S. by Marla Cone, explains to readers about
Rating:Essay Length: 608 Words / 3 PagesSubmitted: February 14, 2010 -
Chemiluminescence
Objective: To create a chemiluminescent result with a reaction time longer than 3 to 4 seconds. Chemiluminescence is an electromagnetic radiation in the form of light. It can be emitted by ultraviolet, visible, or infrared light with the visible light being the most common as well as most useful. In this experiment we test a light creating reaction time by mixing a variety of reagents in order to produce the necessary chemiluminescent result. It is
Rating:Essay Length: 838 Words / 4 PagesSubmitted: May 15, 2010 -
Chemisrty
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 up. The hydrochloric acid is a clear liquid and is also a transparent. The Magnesium is a silver colored ribbon. As it was dissolving the
Rating:Essay Length: 459 Words / 2 PagesSubmitted: February 11, 2010 -
Chemistry
Every day in the news, it is reported that childhood obesity is a growing problem. Many doctors have linked children’s weight gain to the drinking of juice instead of milk and water. Most parent feel good about giving their children 100% juice with no sugar added, thinking it is nutritious. The Center for Disease Control and Prevention notes that children need very few calories per day and the sweet drinks, like apple juice, are a
Rating:Essay Length: 842 Words / 4 PagesSubmitted: November 27, 2009 -
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 + sulphur dioxide + water Na2S2O3(aq) + 2HCl(aq) -> 2NaCl(aq) + S(s) + SO2(g) + H2O(l) Prediction: My prediction for the experiment of mixing the 2
Rating:Essay Length: 3,158 Words / 13 PagesSubmitted: December 1, 2009 -
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 also shows the bonding arrangement of atoms. Ex: C4H10 o H H H H | | | | H-C-C-C-C-H | | | | H H
Rating:Essay Length: 1,289 Words / 6 PagesSubmitted: December 16, 2009 -
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 metric ruler to determine the length, width, and height of aluminum and iron cubes to the nearest 0.5cm. 2. Use the balance to measure the
Rating:Essay Length: 542 Words / 3 PagesSubmitted: January 20, 2010 -
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 19th cent. that organic molecules can be produced artificially in the laboratory, this definition had to be abandoned. Organic chemistry is most simply defined as
Rating:Essay Length: 545 Words / 3 PagesSubmitted: April 19, 2010 -
Chemistry
Chemistry 11 Assignment 2 Total 25 marks Please make sure you highlight your final answer. Failure to do so will result in one mark taken off. Part 1 For the next questions, clearly show all the steps in solving the problems. 0.5 marks will be deducted for each time there is a significant figure error or appropriate units are not used! 1. What is the molar mass (to the nearest tenth of a gram/mole) of
Rating:Essay Length: 908 Words / 4 PagesSubmitted: October 31, 2017 -
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 writing was devoted to a analysis of more than 40 kinds of salt, including descriptions of two methods of extracting sodium chloride and putting it
Rating:Essay Length: 771 Words / 4 PagesSubmitted: December 2, 2009 -
Chemistry - Collision Theory
.Experiment for Chemistry Coursework For this investigation I am looking at how the concentration of acid can change the reaction and how I can explain this using collision theory. My Prediction: I predict that the greater amount of concentration the faster the reaction will take place. Therefore, particles in the two compounds will collide faster. Due to my prediction if it is correct, I expect to see the cross on the paper disappear faster. As
Rating:Essay Length: 1,180 Words / 5 PagesSubmitted: November 23, 2009 -
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 discovered, little was said in chemical or engineering terms. Only a few articles were focused on proteins and bonds and Borganhalogen compounds. I read a
Rating:Essay Length: 652 Words / 3 PagesSubmitted: December 5, 2009 -
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 in which one or more substances are converted into different substances Chemical property-relates to a substance ability to undergo changes that transform it into different
Rating:Essay Length: 1,472 Words / 6 PagesSubmitted: February 15, 2010 -
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 reactants and products. This minimum amount of energy that is required is called the activation energy. • Changing the Temperature: As we increase the temperature
Rating:Essay Length: 263 Words / 2 PagesSubmitted: April 29, 2010 -
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 coveted. This is true as far back as the “Ancient Egyptians who feigned gemstones with glass and glaze, because genuine were too expensive and/or too
Rating:Essay Length: 1,039 Words / 5 PagesSubmitted: May 1, 2010 -
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 assume the shape of their container but do not necessarily fill it. A substance having neither a fixed shape nor a fixed volume is a
Rating:Essay Length: 2,517 Words / 11 PagesSubmitted: November 18, 2009 -
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 beaker. Allow the mixture to stand. b.) Prepare the filtration assembly. The assembly consists of a tapered flask with a buchner funnel inserted in the
Rating:Essay Length: 393 Words / 2 PagesSubmitted: March 8, 2010 -
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 20°C) laboratory apron dropper laboratory balance 2 objects of unknown mass standard masses graduated cylinder, 10-mL graduated cylinder, 100-mL III.PROCEDURE Part A: Estimating the Uncertainty of a Balance 1.We put on lab aprons and goggles. Then, we used the zeroing adjustment to
Rating:Essay Length: 1,567 Words / 7 PagesSubmitted: February 3, 2010 -
Chemistry Lab Techniques and Measurement
Experiment #1 Laboratory Techniques and Measurement PURPOSE The purpose of this laboratory is to become familiar with measurements, materials, calculations, conversions, and procedures used in chemistry lab. DATA 1. Length Measurements Object Centimeters Millimeters a. Pencil 10.5 cm 105 mm b. Checkbook 14.2 cm 142 mm c. Wallet 11.7 cm 117 mm 2. Warm Temperature Measurements Item Temperature a. Tap water 40 Celsius b. Boiling water 97 Celsius 3. Cold Temperature Measurements Item Temperature a.
Rating:Essay Length: 522 Words / 3 PagesSubmitted: April 24, 2011 -
Chemistry Notes
Assessment Task I – Rate of Chemical Reactions Metals and Acids ________________ Planning This investigation looks at the rate of reaction between a metal and three different acids of different protonisties. There are two different ways that this can be investigated, the first way is the ‘Half Life’ or ‘Vf-Vt’ method, and this looks at the decreasing half life in the reaction. The other is the ‘Order’ reaction, this looks at the order of the
Rating:Essay Length: 4,040 Words / 17 PagesSubmitted: February 29, 2016 -
Chemistry of Crime Scene Investigation (arson Experiment)
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 style of pine wood. To do this we first burnt just wood. Then we burnt wood with our accelerator Zippo lighter fluid. Then we burnt
Rating:Essay Length: 473 Words / 2 PagesSubmitted: November 26, 2009 -
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 strength of its absorption (figure1). This has to be carried out at different times and in different conditions to ensure any decrease is not due
Rating:Essay Length: 990 Words / 4 PagesSubmitted: January 18, 2010