| A | B |
|---|
| compound | 2 or more elements chemically combined |
| atom | smallest particle of an element that has the properties of that element |
| molecule | atoms combined by a covalent bond |
| proton | particle inside nucleus with + charge |
| neutron | particle inside nucleus with no electric charge |
| nucleus | small positively charged center of an atom |
| electron | particle with a negative charge |
| Law of Conservation of Mass | Matter can't be created or destroyed in a chemical reaction |
| physical property | It can be observed without changing the identity of the substance. (color, weight..) |
| chemical property | property that describes how a substance changes into a new substance. |
