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Unit 1 Lessons 1-6

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 an object 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 one or more substances change into entirely new substances with different properties
atoms the smallest unit of an element that maintains the properties of that element
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
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
heterogeneous a mixture that does not have a uniform composition
homogeneous a mixture in which substances are evenly spread throughout
solid substance that has definite volume and shape
liquid 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 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
condensation 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
Created by: 18lheatherly0923