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Unit 1, Lessons 1-6

TermDefinition
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 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 Describes a substances 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 Occurs when one or more substances change into entirely new substances with different properties.
Law of conservation of mass States that an ordinary chemical and physical changes.
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 each other.
Pure Substance Elements and Compounds.
Hetrogeneous A heterogeneous mixture is one that does not have a uniform composition.
Homogeneous Describes something that has a uniform structure or composition throughout.
Solid A substance has a definite volume and shape.
Liquid A substance has a definite volume but not a definite shape.
Gas Does not have a definite volume or shape.
Feezing The change in state in which a liquid becomes a solid.
Melting The change of state from a solid to a liquid.
Evaporation When some 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, or vapor.
Condension The change of state form a gas to a liquid.
Sublimation The change from a solid state directly into a gas.
Depositioin The change in state from a gas directly to a solid.
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