CHEM 111 Chapter Notes - Chapter 8: Exothermic Process, Activation Energy, Joule
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Reactants- a chemical substance entering into a reaction. Products- a chemical substance produced from reactants by a chemical change. Chemical equation- a shorthand expression showing the reactants and the products of a chemical change. Law of conservation of mass- no change is observed in the total mass of the substances involved in a chemical reaction; that is, the mass of the products equal the mass of the reactants. A chemical equation is shorthand for expressing a chemical change or reaction. In a chemical reaction atoms are neither created nor destroyed. All atoms in the reactants must be present in the products. Balanced equation- a chemical equation having the same number of each kind of atom and the same electrical charge on each side of the equation. To balance a chemical equation: identify the reaction, write the unbalanced equation, balance the equation. Count the number of atoms of each element on each side and determine which need to be balanced.