Science Key terms

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Across
  1. 4. A chemical reaction that absorbs heat energy
  2. 5. chemical reaction that gives off heat
  3. 8. The path or orbit electrons follow around the nucleus of an atom
  4. 9. The physical matter of which living or nonliving things are composed
  5. 10. A change in matter that does not affect it's chemical composition
  6. 12. Interaction between molecules that causes a chemical change, converting an existing substance into a new substance
  7. 13. One of six elemental gasses that does not naturally react with other elements
Down
  1. 1. A process which nitrogen in the atmosphere enters the soil and becomes part of living organisms that eventually returns to the atmosphere
  2. 2. The ability to do work or cause change; can be changed into different forms and can move between objects
  3. 3. A material with a particular chemical makeup
  4. 6. A process that changes the properties of an element
  5. 7. To act because of something that happened
  6. 11. the smallest unit of an element that has the properties of that element