Science

1. change in any physical property of a substance not the substance itself
4. combination of different substances that remain the same individual substances and can be separated by physical means
6. force that objects exerts on each other because of their masses
7. elliptical path one body, follows around the other
8. measure of the amount of matter in an object
12. air pressure changes with altitude and with temperature
13. substance that contains only a single type of atom
14. substance that consists of two or more different types of atoms bonded together
15. two or more atoms bonded together,or combine

2. change of one substance into another substance
3. characteristics of a substance that can be observed without changing the identity of the substance
5. smallest basic unit of matter
9. how substances can form new substances
10. measure of the amount of space an object takes up
11. measure of the amount of matter present in the given volume of the substance