Science Crossword Puzzle

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Across
  1. 1. substance formed as a result of a chemical reaction
  2. 3. an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge are the same for both the reactants and the product
  3. 4. made up of atoms
  4. 7. substance present at the start of a chemical reaction
  5. 8. a small number or letter written slightly below and to the right of a chemical symbol or variable
Down
  1. 2. the large number in front of the a formula
  2. 5. equation representation of a chemical reaction, showing the starting materials (reactants) on the left and the new substances formed (products) on the right
  3. 6. basic building block of all matter