Chemistry 1
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20 terms
Terms | Definitions |
|---|---|
 matter | the substance or substances of which any physical object (solid, liquid, gas) consists or is composed; something that occupies space |
| atom | a fundamental unit of chemical element and the smallest part of an element that can exist independently |
| molecule | the smallest particle into which a substance can be divided without changing its chemical and physical properties |
| solid | has a definite volume and definite shape (the particles are packed sightly together and stay in fixed positions) |
| liquid | has not definite shave but a definite volume (the particles are packed closely together but move around freely) |
| gas | has neither a definite shape nor volume (the particels spread apart, filling all the space available to them) |
| plasma | a state of matter made up of pure electrons |
| characteristic property | a quality of a substance that never changes (regardless of its state) and can be used to identify a substance |
| boiling point | temperature at which a substance goes from a liquid to gas |
| melting point | temperature at which a substance goes from solidto liquid |
| physical change | change in which the identity of the substance does NOT change |
| chemical change | transforms on type of matter into antoher kinds, which may have different properties |
| melting | the change of solid to a liquid |
| freezing | the change of liquid to solid |
| boiling | the change of a liquid to gas |
| vaporization | the change of a liquid to gas |
| evaporation | the change of a solid to gas |
| condensation | the change of a gas to liquid |
| sublimation | the change of a gas to a solid |
| colloids | a heterogeneous mixture in which solute-like particles do not settle out |
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