Physical Science Ch 7 Test Review

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Across
  1. 5. what element must be present for a combustion reaction to occur
  2. 6. a reaction is balanced if the total number of each element is __ on both sides
  3. 7. we use a thermometer to measure this chemical change indicator
  4. 10. how many reactants does a decomposition reaction start with
  5. 11. what type of value is a mole?
  6. 12. any reaction in which electrons are lost
  7. 13. the mass of one mole of a substance
  8. 16. the type of reaction where one element gains and one loses electrons
  9. 17. which chemical reactions does the replacement of one cation with the cation in a chemical compound
Down
  1. 1. a visual evidence of gas from a chemical change
  2. 2. the unit of molar mass
  3. 3. a chemical reaction that combines two molecules into one new product
  4. 4. any reaction in which electrons are gained
  5. 8. the solid that forms after a chemical change
  6. 9. a chemical ____ models the a chemical reaction using symbols
  7. 14. the coefficient in front of a molecule represents the number of ___.
  8. 15. the replacement reaction where both cation and anions are switched in the reaction