Reactions 2 crossword - LMH

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Across
  1. 5. A substance used to make another substance in a chemical reaction (8)
  2. 6. An image used to show atoms before and after chemical reactions (8,7)
  3. 7. Greenhouse ___ (3)
  4. 10. With heat (7)
  5. 11. Is a cold pack exothermic or endothermic? (11)
  6. 12. Acronym used to remember the difference between exothermic and endothermic reactions (9)
  7. 14. A substance made from other substances in a chemical reaction (7)
Down
  1. 1. A reaction that separates the particles of a substance (13)
  2. 2. A substance that stores energy chemically (4)
  3. 3. Nitrogen + oxygen (8,8)
  4. 4. CO2 (6,7)
  5. 8. A fuel that can't be used faster than it is made/found/mined (9)
  6. 9. New energy source commonly used in cars
  7. 12. Conserved during both chemical reactions and physical changes (4)
  8. 13. The substance that group 2 of the periodic table make when thermally decomposed (7)