Energy changes in chemical reactions

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Across
  1. 3. Fuels are useful because they are capable of releasing ____ amounts of energy as heat.
  2. 4. Simplest hydrocarbon?
  3. 9. Endothermic reaction- heat is _____ in?
  4. 10. The heat of combustion is the energy change of a reaction when substance is
  5. 12. Chemical bonds are forces of attraction between atoms or ....?
  6. 13. All combustion reactions are ______?
  7. 14. Major characteristics that make these fuels so useful, they are easy to ____ and burn.
  8. 15. Exothermic reaction- heat is _____ out?
  9. 16. The reaction between Nitrogen and Oxygen is what kind of reaction?
  10. 17. During endothermic reaction the temperature _____
  11. 18. example of endothermic reaction is ice ____?
Down
  1. 1. Molecules contain only the elements carbon and hydrogen called?
  2. 2. Some bonds are stronger than others. They require more energy to break them, but they give out ____ energy when they are formed.
  3. 5. heat given out?
  4. 6. heat taken in?
  5. 7. _____ chemical bonds takes in energy from the surroundings.
  6. 8. nitrogen+oxygen=nitrogen_____
  7. 11. _____ chemical bonds gives out energy to the surroundings.
  8. 12. During exothermic reaction the temperature _____?
  9. 13. Methane reacting with oxygen to produce carbon dioxide and water is what reaction?