Across
- 5. a chemical change in which a single compound is broken down into two or more simpler products
- 9. a substance that increases the rate of reaction by lowering the activation-energy barrier
- 10. an expression representing a chemical reaction: the formulas of the reactants (on the left) are connected by an arrow with the formulas for the products (on the right)
- 11. a chemical change in which one element replaces a second element in a compound; also called a displacement reaction
- 12. a small whole number that appears in front of a formula in a balanced chemical equation
- 13. an equation for a reaction in solution showing only those particles that are directly involved in chemical change
- 14. a chemical change that involves an exchange of positive ions between two compounds
Down
- 1. a chemical equation that does not indicate the relative amounts of reactants and products
- 2. a list of elements in order of decreasing activity
- 3. a chemical change in which an element or a compound reacts with oxygen , often producing energy in the form of heat or light
- 4. a chemical change in which two or more substances react to form a single new substance; also called a synthesis reaction
- 6. an equation that shows dissolved ionic compounds as dissociated free ions
- 7. an ion that is not directly involved in a chemical reaction; an ion that does not change oxidation number or composition during a reaction
- 8. a chemical equation in which mass is conserved; each side of the equation has the same number of atoms of each element