chemical reactions

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Across
  1. 4. __________ is always a reactant in a combustion reaction
  2. 6. magnesium + zinc sulfate magnesium sulfate + zinc
  3. 9. Products are always carbon dioxide and water
  4. 10. Two or more simple substances combine to form a more complex product
Down
  1. 1. For the following chemical reaction: zinc + iron sulfate ---> zinc sulfate + iron, the products are___________
  2. 2. For the following chemical reaction: calcium + bromine ---> calcium bromide, the reactants are_______________
  3. 3. lead(II) nitrate and potassium iodide to form potassium nitrate and lead iodide
  4. 5. A single compound breaks down into two or more elements or new compounds
  5. 7. Smaller reactants have greater_______________,making it easier for them to react
  6. 8. Higher_______________provide more energy for the systems in which reactants react