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Chapter 10 Chemical Reactions

1 Smith, Clark (CC-BY-SA ) GCC CHM 130 Chapter 10: Chemical Reactions Chapter 10 Chemical Reactions Law of Conservation of Matter The Law of Conservation of Matter tells us that matter (or mass) cannot be created nor destroyed. This is very important in Chemical Reactions because it means that the mass of the reactants must equal the mass of the products. Or in other words, the number of reactant atoms must equal the number of products atoms. Because of this law Chemical Reactions must be balanced. What is a Chemical reaction? It is when we us formulas and symbols to describe a Chemical reaction, or reactants becoming products: A + B C + D reactants products what we start with new substance(s) formed Symbols: You must know which elements are solid, liquid, and gas!

10.9 Redox Reactions Many single replacement, combination, decomposition and combustion reactions are also redox reactions. Redox is short for reduction and oxidation. Reduction is when an element’s charge goes down and oxidation is when an element’s charge goes up. Note you can’t have reduction without oxidation and vice versa.

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