1. Matter vocabulary

2. Atoms smallest part of matter Atoms have four main parts: nucleus, electrons, neutrons and protons.

3. Chemical Change When a substance changes and it creates a brand new substance. Compounds are always the result of a chemical change. Examples: milk turning sour, a nail rusting, a fire burning something Hints that it might be a chemical reaction: energy is released (fire), energy is absorbed (cooking), release of gas (car exhaust)

4. Chemistry the scientific study of what matter is made of and how it reacts when it comes into contact with other matter

5. Compound a substance that is formed when the atoms of two or more elements join together chemically

6. Density the measure of how much mass something has for its size

7. Electron a part of an atom that has a negative electrical charge and is found outside the atom's nucleus

8. Elements substances that cannot be broken down into simpler substances There are 2 main groups of elements - metals and nonmetals

9. Gas matter that has no definite shape or volume

10. Liquid matter that has a definite volume but no definite shape

11. Mixture a substance made of two or more elements or compounds that are mixed together but not chemically joined

12. Neutron a part of an atom that has no electrical charge and is found inside the atom's nucleus

13. Physical Change A change that affects only the state, shape or volume of matter. It does not change the atoms/molecules that make up the substance Examples: crushing, tearing, grinding, freezing, melting, boiling

14. Physics the scientific study of what energy is and how it interacts with matter

15. Property A way to describe matter, such as color, shape, odor, and hardness

16. Proton a part of an atom that has a positive electrical charge and is found inside the atom's nucleus

17. Solid matter that has a definite shape and volume

18. Solution a kind of mixture in which one substance dissolves, or seems to disappear, into another substance