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Matter
Unit 1 Lessons 1-6
| Term | Definition |
|---|---|
| matter | anything that has mass and takes up space |
| mass | describes the amount of matter in an object |
| weight | a measure of the gravitational force on an object |
| volume | the amount of space that an object takes up |
| density | a measure of the amount of mass in a given volume |
| physical property | a character of a substance that can be observed and measured without changing the identity of the substance |
| chemical property | a substance's ability to change into a new substance with different properties |
| physical change | a change that affects one or more physical properties of a substance |
| chemical change | when one or more substances change into entirely new substances |
| law of conservation of mass | states that in ordinary chemical and physical changes, mass is not created or destroyed but is only transformed into different substances |
| atoms | the smallest unit of an element that maintains the properties of that element |
| element | a substance that is made up of one or more of the same kind of atom chemically combined |
| compound | substances made up of different kids of atoms chemically combined |
| mixture | substances that contain a variety of elements and compounds that are not chemically combined with each other |
| pure substances | elements and compounds |
| heterogeneous mixture | a mixture that does not have a uniform composition |
| homogeneous mixture | a mixture in which substances are evenly spread throughout |
| solid | a substance that has a definite volume and shape |
| liquid | a substance that has a definite volume but not a definite shape |
| gas | a substance that does not have a definite volume or shape |
| freezing | the changing in state in which a liquid becomes a solid |
| melting | when a solid is warmed and its particles have more energy than they had before and the attraction between the particles decreases and the particles are able to slide past each other |
| evaporation | when the surface of a liquid becomes a gas |
| boiling | a rapid change from a liquid to a gas |
| condensation | the change of state from a gas to a liquid |
| sublimation | the change from a solid state directly into a gas |
| deposition | the change in state from a gas directly into a solid |
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