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All Info About Chemistry AIA Chemistry Topics Shop For Books With Amazon Hello and welcome! The All Info About Chemistry site is written and compiled by me, Anne Helmenstine, Ph.D. I hope you enjoy your visit and if there is anything you'd like to see on my site please e-mail me at chemistry@allinfoabout.com Featured Content A calorimeter is a device used to measure the quantity of heat flow in a chemical reaction. Learn about two of the most common types of calorimeters, the coffee cup calorimeter and the bomb calorimeter, and find out how to use them to calculate heat flow and enthalpy change. Alkane Nomenclature Alkanes are the first hydrocarbons introduced in organic chemistry. They are also seen in biochemistry and general chemistry. Here is a look at the nomenclature or rules for naming straight chain, branched, and cyclic alkanes. Chemistry Chronology - 1800 to 1850 Learn about the great discoveries made in chemistry from 1800 to 1850. It was a busy and exciting time for science! Valences of the Elements Most students think that the valence of the element nitrogen is '-3'. Real-world chemists know that nitrogen participates in reactions with a valence anyway from '-3' to '+5' (although it never has a valence of 0). Use the periodic table to determine common valences, but use this chart to see the spectrum of valences really seen for the elements. How to Do a Flame Test You can learn a lot about an unknown sample by observing the colors it produces when it is burned. Here's how to perform the flame test for qualitative analysis of metal salts.

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Monday, June 7, 2004 Homework Help Forum Homework Help Experts Chemical Reactions Leo Galleguillos January 31st, 1999, 2:36 p.m. ET Learning about chemical reactions is one of the first lessons in chemistry. A chemical reaction, by definition, is a process in which one set of substances turns into a new set of substances. A simple example of a chemical reaction is when you make a chocolate cake. Your ingredients include cake mix, eggs, and oil. Each of the three ingredients together form the cake, but by themselves, they are completely different. Chemical reactions take place in living organisms everyday. Every time you take a breathe of air, a chemical reaction occurs in your body. It is the reaction of carbon dioxide (CO ) and water (H O). When carbon dioxide hits the water in your bloodstream, another chemical reaction occurs. The result is carbonic acid (H CO ). The chemical reaction can also be written in notation: CO + H H CO In many chemical reactions, a catalyst is involved. A catalyst is a substance that speeds up a chemical reaction without using energy. Catalysts are very important because without them, our body would take in more carbon dioxide than could be released. It should be noted that the reaction does not go to completion (or your blood would fluctuate in pH constantly). The CO2 + H20 reaction is heavily favored to the left in terms of equilibrium. Evidence of this is soda pop. If you leave it untopped, it goes flat (H2CO3 -> CO2 + H20).

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