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