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Matter and Energy

Unit 1

TermDefinition
matter anything that has mass and takes up space
mass describes the amount of matter in an object
volume amount of space that an object takes up
density a measure of amount of mass in a given volume
weight measure of gravitational force on an object
physical property a characteristic of a substance that can be observed and measured without changing the identity of the substance
chemical property a substances ability to change into a new substance with different properties
physical change 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 an ordinary chemical and physical changes mass is not created or destroyed but is only transformed in to different substances
atom 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 is one that does not have a uniform composition
homogeneous something that has a uniform structure or composition
solid substance that has a definite volume and shape
liquid substance has a definite volume but not a shape
gas doesn't have a definite volume or shape
freezing change of state which a liquid becomes a solid
melting change of state from a solid to a liquid
evaporation some particles gain enough energy that they escape from the surface of a liquid and become a gas
boiling a rapid change from a liquid to a gas
condesation a change from gas to a liquid
sublimation change from a solid state directly into a gas
deposition change in state from a gas directly to a solid
Created by: 18ddunn0914
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