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Unit 3

matter anything that has math and takes up space
mass describes the amount of matter in an object
weight a measure of gravitational force
volume the amount of space an object takes up
density a measure of the amount of mass
physical property a characteristic of an object that can be observed without changing it
chemical property describes a substance's ability to change into a new substance with new properties
physical change a change that affects one or more physical properties of a substance
chemical change occurs when one or more substances with different properties
law of conservation of mass in ordinary chemical and physical changes, mass is not created or destroyed
atom the smallest unit of an element
element made up of one or more of the same kind of atom chemically combines
compound made up of different kinds of atoms
mixture contains a different variety of atoms
pure substance a substance that has a definite physical and chemical property
hetereneous mixture is one that does not have a uniform compisition
homogeneous a mixture that dissolves
solid substance has definite volume and shape
liquid a substance that has a definite volume but not shape
gas does not have a definite volume or shape
freezing the changing state when a liquid becomes a solid
melting when the substance changes from a solid to a liquid
evaporation when a liquid becomes a gas
boiling a rapid change of liquid to gas
condensation the state from a gas to a liquid
sublimation change from a solid directly to a gas
deposition direct change from a gas to a solid
Created by: 18dlooney0614