| Term | Definition |
|---|
| matter | substance that has mass and occupies space (has volume) |
| physical properties/changes | include mass, volume, weight, odor, shape, texture, taste, hardness, melting, freezing, boiling point. |
| mass | quantity of matter in an object |
| D=m/v | Formula to find density? |
| volume | amount of space that matter occupies |
| weight | measure of the force of gravity on an object |
| solid, liquid, gas | three phases of matter |
| chemical properties/changes | type of change where the substance is permanently changed |
| a triangle | shape that equals change |
| composition of matter | all forms of matter are composed of atoms |
| atoms | basic, tiny, indivisible unit of matter |
| subatomic particles | atoms consist of many smaller particles called...and there are three main ones |
| 99.9% | the proton and the neutron make up how much of an atom's mass? |
| proton | psitively charged |
| neutron | negatively charged |
| atomic number | number of protons in the nucleus of an atom; identifies an atom |
| mass number | number of protons + number of neutrons |
| elements | substances that consist of only one type of atom |
| 109 | How many different elements? |
| 90 | How many elements are found in nature? |
| isotopes | atoms of the same element that have the same number of protons but different numbers of neutrons |
| radioactive isotopes | atoms that give off radiation |
| chemical compounds | elements combine to form substances consisting of two or more different atoms |
Combine with other sets
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