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Matter Unit 1
| Term | Definition |
|---|---|
| matter | anything that has mass |
| 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 subsatnce |
| chemical property | describes a substances 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, mass is not created or destroyed but is only transformed into different substances |
| atom | the smallest unit of an element that maintains the properties of that element and is the building block of matter |
| element | made up of one or more of the same kind of atom chemically combined |
| compound | made up of different kinds of atoms chemically combined and have different properties from the elements that make them up |
| mixture | contains a variety of elements and compounds that are not chemically combined with each other |
| pure substance | a substance that has definite physical and chemical properties such as appearance, melting point, and reactivity |
| hetrogeneous | a mixture that is one that does not have a uniform compisition |
| homogeneous | describes something that has a uniform structure or composition state |
| solid | substance 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 | change of state that a solid becomes a lquid |
| evaporation | when a liquid is warmed and it becomes a gas |
| boiling | a rapid change from a liquid to a gas or vapor |
| condensation | change in state from a gas to a liquid |
| sublimation | change in state from a solid directly to a gas |
| deposition | change in state from a gas directly to a solid |