Science Key terms

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