Chap4 - Chem. 200 Dr. Saidane Lecture Notes Chapter 4...

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Chem. 200 Dr. Saidane Lecture Notes Chapter 4 Chemical Equations and Reactions 1. A Chemical reaction is the process by which one or more substances, called reactants , are changed into one or more different substances called products . A chemical reaction is described by a chemical equation. Atoms of one reactant bond with atoms of another reactant to form products with a different combination and structure. 2. A chemical equation represents with symbols (see table 1) and formulas, the identities and relative amounts of the reactants and products in a chemical reaction. The law of conservation of mass must be satisfied in every chemical equation, meaning that atoms are neither created nor destroyed in the chemical reaction. The number of atoms of reactants must be the same as the number of atoms of products. 3. Balancing Chemical Equations Equalizing the number of atoms on each side of a chemical equation is called balancing the chemical equation . When balancing a chemical equation, a coefficient , which is a whole number , is added when necessary in front of the formula of the reactants and products. An equation must never be balanced by changing the subscripts in the chemical formulas. To balance a chemical equation it is best to: 4. Consider one element at a time. 5. Always start balancing the elements in the most complicated formula. 6. Balance first the element that occurs in the fewest formulas. 7.
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Chap4 - Chem. 200 Dr. Saidane Lecture Notes Chapter 4...

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