Reactions and Energy

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Across
  1. 3. the gate that lets substances in and out of a cell
  2. 6. A slow chemical reaction where oxygen reacts with metal
  3. 7. the protective outside layer of a cell
  4. 8. A substance that can burn to release energy
  5. 9. A reaction between fuel and oxygen that creates energy
Down
  1. 1. an attractive force that holds two atoms together
  2. 2. a simple sugar made of carbon, hydrogen and oxygen
  3. 4. groups of atoms bonded together
  4. 5. the result of a chemical reaction