| A | B |
|---|
| Chemistry | study of matter and its changes |
| Matter | makes up all living and non living things |
| Physical Properties of Matter | weight, mass volume and density |
| Chemical Properties of Matter | tell how one material reacts with another to form a new material |
| Water | Formed when Hydrogen and Oxygen are combined |
| Study the properties of matter | way to tell difference between each kind of matter |
| properties of matter | things that make it different from another material |
| Properties of Matter | Physical and Chemical |
| atoms | very small particles that make up all matter |
| Democritus | Greek philosopher who proposed the idea of small units called atoms |
| protons, neutrons, & electrons | smaller particles that atoms are made of |
| protons | in the nucleus -- have a positive charge |
| neutrons | in the nucleus -- have no charge |
| electrons | orbit the nucleus -- have a negative charge |
| number of electrons and number of protons in an atom | always equal |
| nucleus | center of an atom -- takes up very small part of atom's total space |
| electron cloud | takes up most of atom's space -- space where electrons orbit |
