"Chemical Change Challenge: Crossword Puzzle"

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Across
  1. 4. Law stating mass is conserved in a chemical reaction
  2. 7. Solid formed in a solution during a chemical reaction
  3. 8. Symbolic representation of a chemical change
  4. 10. Adjusting atoms to be equal on both sides of equation
Down
  1. 1. Reaction that releases energy to surroundings
  2. 2. Energy needed to start a chemical reaction
  3. 3. Reaction where two reactants form one product
  4. 5. Element with symbol "Na" and valency 1
  5. 6. Reaction where a compound breaks into simpler substances
  6. 9. Number of electrons an atom gains, loses, or shares