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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 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
Created by: 18rliu1008