week08 - Ch05. Chemical Reactions and Equations What is a...

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1 1 Ch05. Chemical Reactions and Equations • What is a chemical reaction? • How do we know a chemical reaction occurs? • Writing chemical equations • Predicting chemical reactions • Representing reactions in aqueous solution 2 What is a chemical reaction? •C h e m i c a l r e a c t i o n – The conversion of one substance or several substances into new substances •R e a c t a n t ( s ) – Substances to begin with • Product(s) – New substances formed • Characteristics: – Color change; release / absorb of heat; gas formation; precipitation
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2 3 Chemical Equations • A symbolic representation of a reaction • Balanced equation – The number of atoms of each element is the same in the products as in that reactants – Conservation of mass is always maintained 4 Balancing Equation Balancing Equation • Why balancing - Law of conservation
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This note was uploaded on 02/14/2011 for the course CHEM 111 taught by Professor Cao during the Fall '07 term at Purdue.

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week08 - Ch05. Chemical Reactions and Equations What is a...

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