Across
- 2. a number placed in front of an element symbol or chemical formula in an equation
- 6. law that states that the total mass of the reactants before a chemical reaction is the same as the total mass of the
- 7. a chemical reaction in which a substance combines with oxygen and releases energy
- 9. a type of chemical reaction in which one compound breaks down and forms two or more substances
- 10. a description of a reaction using element symbols and chemical formulas
- 12. a type of chemical reaction in which one element replaces another element in a compound
- 13. a type of chemical reaction in which the negative ions in two compounds switch places, forming two new
- 14. a type of chemical reaction in which two or more substances combine and form one compound
- 15. a substance that increases reaction rate by lowering the activation energy of a reaction
- 16. a chemical reaction that releases thermal energy
- 17. a substance that slows, or even stops, a chemical reaction
Down
- 1. a catalyst that speeds up chemical reactions in living cells
- 2. a process in which atoms of one or more substances rearrange to form one or more new substances
- 3. the minimum amount of energy needed to start a chemical reaction
- 4. a substance produced by a chemical reaction
- 5. after the chemical reaction
- 8. a chemical reaction that absorbs thermal energy
- 11. a starting substance in a chemical reaction