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Matter
Unit 1 Lessons 1-6
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 |
density | a measure of the amount of mass in a given volume |
physical property | a character 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 | when one or more substances change into entirely new substances |
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 |
atoms | the smallest unit of an element that maintains the properties of that element |
element | a substance that is made up of one or more of the same kind of atom chemically combined |
compound | substances made up of different kids of atoms chemically combined |
mixture | substances that contain a variety of elements and compounds that are not chemically combined with each other |
pure substances | elements and compounds |
heterogeneous mixture | a mixture that does not have a uniform composition |
homogeneous mixture | a mixture in which substances are evenly spread throughout |
solid | a substance that has a definite volume and shape |
liquid | a substance that has a definite volume but not a definite shape |
gas | a substance that does not have a definite volume or shape |
freezing | the changing in state in which a liquid becomes a solid |
melting | when a solid is warmed and its particles have more energy than they had before and the attraction between the particles decreases and the particles are able to slide past each other |
evaporation | when the surface of a liquid becomes a gas |
boiling | a rapid change from a liquid to a gas |
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 into a solid |