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unit 1.2
science
| Term | Definition |
|---|---|
| atom | the smallest unit of an element that maintains the properties of that element |
| element | a substance that can not be seperated or broken down into simpler substances by chemichal means |
| compound | a substance made up of atoms of two or more diffrent elements joined by chemical bonds |
| mixture | a combination of two or more substances that are not chemichally combined |
| puresubstance | a sample of matter either a single element or a single compound |
| hetrogeno | describes something that does not have a uniform structure or compisitional throughout |
| homogenous | describes something that has a uniform structure or composition |
| solid | the state of matter in wich the voulume and shape of a substance are fixed |
| liquid | the state of matter that has a definite voulume but not a definite shape |
| gas | a form of matter that does not have a definite voulume orf shape |
| freezing | a change of state from a liquid to a solid |
| melting | a change of state of state from a solid to a liquid |
| evaporation | the change of state from a liquid to a gas that usally occurs at the surface ofa liquid over a wide range of tempatures |
| boiling | the change of state from a liquid to a gas that occurs at a specific tempature |
| sublimation | the change of state from solid directly to a gas |
| deposition | the change of state from a gas directly to a solid |
| condesation | the change of state from a gas to liquid |