Chapter 7 Crossword

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Across
  1. 7. a reaction in which one element is substituted for another element in a compound
  2. 9. a very important and small unit of measurement that chemists use
  3. 10. symbolic representations of chemical reactions in which the reactants and the products are expressed in terms of their respective chemical formulae
  4. 11. a chemical reaction in which less energy is needed to break bonds in the reactants than is released when new bonds form in the products
  5. 12. anychemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron
  6. 13. the mass in grams of 1 mole of the substance
  7. 14. a number placed in front of a formula to balance a chemical equation.
  8. 15. a chemical reaction in which a fuel undergoes oxidation by reacting with an oxidising agent, resulting in the release of energy
Down
  1. 1. Energy stored in the bonds of chemical compounds.
  2. 2. reactions that occur when two different atoms or molecules interact to form a different molecule or compound
  3. 3. reactions in which the reactants absorb heat energy from the surroundings to form products
  4. 4. a substance that is present at the end of a chemical reaction
  5. 5. a substance that takes part in and undergoes change during a reaction
  6. 6. a reaction in which the positive and negative ions of two ionic compounds exchange places to form two new compounds
  7. 8. a reaction in which a compound breaks down into two or more simpler substances.