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Matter and Energy

Unit 1, Lessons 1-6

Matter Anything that has mass and takes up space.
Mass A measure of the amount of matter in an object.
Weight A measure of the gravitational force exerted on an object.
Volume The amount of space that an object takes up or occupies.
Density The ratio of the mass of a substance to the volume of the substance.
Physical Property A characteristic of a substance that does not involve a chemical change, such as density, color, or hardness.
Chemical Property A property of matter that describes a substances ability to participate in chemical reactions.
Physical Change A change of matter from one form to another without a change in chemical properties.
Chemical Change A change that occurs when one or more substances change into entirely new substances with different properties.
Law of Conservation of Mass The law that states that mass cannot be created or destroyed in ordinary chemical and physical change.
Atom The smallest unit of an element that maintains the properties of that element.
Element A substance that cannot be separated or broken down into simpler substances by chemical means.
Compound A substance made up of atoms of two or more different elements joined by chemical bonds.
Mixture A combination of two or more substances that are not chemically combined.
Pure Substance A sample of matter, either a single element or a single compound, that has definite chemical and physical properties.
Heterogeneous Describes something that does not have a uniform structure or composition throughout.
Homogeneous Describes something that has a uniform structure or composition throughout.
Solid The state of matter in which the volume and shape of a substance are fixed.
Liquid The state of matter that has a definite volume but not a definite shape.
Gas A form of matter that does not have a definite shape or volume.
Freezing The change of state from a liquid to a solid.
Melting The change of state from a sold to a liquid.
Evaporation The change of state from a liquid to a gas that usually occurs at the surface of a liquid over a wide range of temperatures.
Boiling The change of state from a liquid to a gas that occurs at a specific temperature.
Condensation The change of state from a gas to a liquid.
Sublimation The change of state from a solid directly to a gas.
Deposition The change of state from a gas directly to a solid.