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unit 1 lesson 1

matter anything that has mass and takes up space
mass describes the amount of matter in an object
weight a measure of 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 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 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 nor destroyed but is only transformed 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 to eachother
pure substance substance that has definite physical properties such as, appearance, melting point, and reactivity.
heterogeneous a mixture that does not have a uniform composition
homogeneous a mixture that the substances are evenly spread throughout
solid a substance that has definite volume and space
liquid substance that has a definite volume, but not a definite shape
gas does not have a definite volume or space
freezing the change in a state in which a liquid becomes a solid
melting the state of change from solid to iquid
evaporation the process of a liquid changing into a gas slowly
boiling a rapid change from a liquid to a gas
condensation the state of change from a gas to a liquid
sublimation the process of a solid changing directly to a gas
deposition the process of a gas changing directly into a solid
Created by: 18richterj0615