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Unit 1: Matter

Lessons 1-6

Matter Anything that has mass and takes up space
Mass 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 occupies
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 subtance
Chemical Change When one or more substances change into entirely new substances with different properties
Law of Conservation of mass 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 A substance that has definite physical and chemical properties such as appearance, melting point, and reactivity
Heterogeneous A mixture that does not have a uniform composition
Homegeneous Describes something that has a uniform structure or composition throughout
Solid A substance with a definite volume and shape
Liquid A substance with a definite volume but not a definite shape
Gas A substance without a definite volume or shape
Freezing The change in state in which a liquid becomes a solid
Melting A change of state from a solid to a liquid
Evaporation When 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
Condensation A change of state from a gas to a liquid (reverse evaporation)
Sublimation The change in state from a solid state directly into a gas
Deposition The change in state from a gas directly to a solid
Created by: 18Fontek0105