Chemical Reactions

3. chemical reaction that gives off heat energy
7. a process that changes substances into new substances
10. a material with a particular chemical makeup
11. a chemical reaction that absorbs energy
12. a change in the matter that doesn't affect it's chemical composition
13. to act because of something that happened
14. one of the six elemental gases that doesn't naturally react with other elements

1. the smallest unit of an element that has all the chemical properties of that element
2. the ability to do work or cause change, can be changed into different forms and can move between objects
4. a substance that has a unique composition and the properties; it may exist as a solid, liquid, or gas
5. a process in which nitrogen in the atmosphere enters the soil and becomes part of living organisms then eventually returns to the atmosphere
6. interaction between molecules that cause a chemical change, converting an existing substance into a new one
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