Chemical

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Across
  1. 2. – something kept for future use (e.g., energy in food or fuel)
  2. 7. – what happens when substances change chemically
  3. 9. – a reaction that takes in heat
  4. 11. – to use heat or fire to cause a change
  5. 12. – the substance made after a chemical reaction
  6. 15. – a gas needed for combustion
Down
  1. 1. – a chemical reaction involving burning
  2. 3. – the ability to do work or cause change
  3. 4. – a form of energy often released in reactions
  4. 5. – stores chemical energy and powers devices
  5. 6. – the connection between atoms in a molecule
  6. 8. – a substance burned to release energy
  7. 10. – an element found in fuels and living things
  8. 13. – something that becomes different (e.g., physical or chemical)
  9. 14. – a reaction that gives off heat