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Unit 1 book 3
lessons 1-6
Term | Definition |
---|---|
matter | anything that has mass and takes up space |
mass | the amount of matter in an object |
weight | a measure of the gravitational force |
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 | 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 | occurs when one or more substances change into entirely new substances with different properties |
law of conservation of mass | states that in ordinary chemical and physical changes. |
atom | the smallest unit if an element that maintains the properties of that element. |
element | is made up of one or more of the same kind of atom chemically combined. |
compound | made up of different kinds of atoms chemically combined. |
mixture | a variety if elements and compounds that are not chemically combined with each other. |
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 has a uniform structure or composition throughout. |
homogeneous | describes something that has a uniform structure or composition throughout. |
solid | a substance that has a definite volume and shape. |
liquid | a substance that has a definite volume but not a definite shape. |
freezing | the change of state in which a liquid becomes a solid. |
melting | the 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 a gas. |
boiling | a rapid change from a liquid to a gas, or vapor |
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 to a solid. |