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unit 1
matter and energy
| 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, or occupies |
| density | a measure of the amount of mass in a given volume |
| physical property | a characteristic of a substance that can be observed and measured without changing the identity of the substance |
| chemical property | describes a substance's ability to change into a new substance with different properties |
| physical change | a change of matter from one form to another without a change in chemical properties |
| chemical change | a change that occurs when one or more substances change into entirely new substances with different properties |
| law of conservation of mass | the law that states energy cannot be created or destroyed but can be changed forms |
| atom | the smallest unit of an element that maintains the properties of that element |
| element | a substance that cannot be separated or broken |
| compound | a substance made up of atoms of two or more different elements joined by chemical bonds |
| mixture | a combination of two or more substances that are not chemically combined |
| pure substance | a sample of matter, either a single element or a single compound, that has definite chemical and physical properties |
| heterogeneous | describes something that does not have a uniform structure or composition throughout |
| homogeneous | describes something that has a uniform structure or composition throughout |
| soild | a substance that has a definite volume and shape |
| liquid | a substance that has a definite volume but not a definite shape |
| gas | does not have a definite volume or shape |
| freezing | the change in state in which a liquid becomes a solid |
| melting | this change of state from a solid to a liquid |
| evaporation | particles gain enough energy that they escape from the surface of the liquid and become gas |
| boiling | a rapid change from a liquid to a gas, or vaper |
| condensation | state from a gas to a liquid |
| sublimation | change from a solid state directly into a gas |
| deposition | change gas directly to a solid |
Created by:
18levinsone0903
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