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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 cannot be separated or broken down into simpler substances by chemical means. |
Compound | A substance made up of atoms of tow or more different elements joined by chemical bonds. |
Mixture | A combination of two or more substances that are not chemically combined. |
Pure substances | 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. |
Solid | The state of matter in which the volume and shape of a substances are filled. |
Liquid | The state of matter that has a definite volume but not a definite shape. |
Gas | A form of matter that does not have a definite volume or shape. |
Freezing | The change of state from a liquid to a solid. |
Melting | The change of state from a solid to a liquid. |
Evaporation | The change of state from a liquid to a gas that usually occurs at the surface of a liquid over a wide range of temperatures. |
Boiling | The change of state from a liquid to a gas that occurs at a specific temperature. |
Condensation | The change of state from a gas to a liquid. |
Sublimation | The change of state from a solid directly to a gas. |
Deposition | The change of state from a gas directly to a solid. |