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