Chemical Equations/Substances

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