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Unit 1: lessons 1-6

The new book iz heer!

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, or occupies.
Density A measure of the amount of mass that is 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 the 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 Occurs when one or more substances changes 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 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 with each other.
Pure substance Elements and compounds.
Heterogeneous one that does not have a uniform composition.
Homogeneous One that has a uniform composition.
Solid Has a definite volume and shape.
Liquid Has a definite volume but not a definite shape
Gas Does not have a definite volume or shape.
Freezing The change in state in which a liquid becomes a solid.
Melting The change in state in which a solid becomes a liquid.
Evaporation The change in state in which a liquid becomes a gas
Boiling The rapid change from a liquid to a gas
Condensation The change of a gas to a liquid.
Sublimation The change of a solid state directly into a gas
Deposition The change in state from a gas directly to a solid.