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Unit 1


matter anything that has mass and takes up space
mass the amount of matter in an object
weight a measure of the gravitational force on an object
volume the amount of space the an object takes up
density a measure of the amount of mass in a given volume
physical property a characteristic of a substance that can be observed without changing the identity of the object
chemical property a substance's ability to change into a new substance with different properties
physical change a change that affects one or more properties of a substance
chemical change when one or more substances change into entirely new substances with different properties
law of conservation of mass states that in ordinary chemical and physical changes, mass is not created or destroyed but only transferred into different substances
atom 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 eachother
pure substance a substance that has definite physical and chemical properties such as appearance,melting point, and reactivity
heterogenous a mixture that does not have a uniform composition
homogenous a mixture with the same composition throughout
solid a substance that has definite volume and shape
liquid a substance that has a definite volume but not a definiute shape
gas does not have a definite volume or shape
freezing when a liquid becomes solid
melting when a solid becomes liquid
evaporation when a liquid becomes gas, at a very slow rate
boiling when a liquid becomes gas, at a rapid rate
condensation when a gas becomes liquid
sublimation when a solid changes directly to gas
deposition when a gas changes directly to a solid
Created by: 18boller0315