Science Crossword Puzzle

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Across
  1. 3. A substance containing atoms of two or more elements bonded together.
  2. 4. The energy released when atoms form bonds.
  3. 8. The starting substances in a chemical reaction.
  4. 10. The substances that appear at the end of a chemical reaction.
  5. 11. The number placed in front of an element symbol in an equation.
  6. 12. The process in which a plant turns sunlight, water, energy, carbon dioxide and hydrogen to make sugar glucose as food.
  7. 14. Chemical bonds of glucose are broken, releasing energy.
Down
  1. 1. More energy is absorbed than released in this reaction.
  2. 2. Energy is never created or destroyed; it is just constantly being reused.
  3. 5. Heat energy that causes molecules to move around.
  4. 6. More energy is released than absorbed in this reaction.
  5. 7. A small number located after an element symbol at the bottom and is the quantity of the element.
  6. 9. Reaction One or more substances rearrange to form one or more new substances.
  7. 13. A small particle that is the building block of all matter