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Matter
Unit 1
Term | Definition |
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matter | anything that has mass and takes up space |
mass | a measure of the amount of matter in an object |
weight | a measure of the gravitational force exerted on an object; its value can change with the location of the object |
volume | the amount of space that an object takes up or occupies |
density | the ratio of the mass of a substance to the volume of the substance |
physical property | a characteristic of a susbtance that does not involve a chemical change, such as density, color, or hardness |
chemical property | a property of matter that describes a substance's ability to participate in chemical reactions |
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 enirely new substances with different properties |
law of conservation of mass | the law that states that energy cannot be created or destroyed but can be changed from one form to another |
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 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 |
solid | the state of matter in which the volume and shape of a substance are fixed |
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 |