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Matter & Energy

Unit 1 : Lesson 1-6

TermDefinition
Matter Anything that has mass and takes up space
Volume The amount of space that an object takes up, or occupies
Mass Describes the amount of matter in an object
Density Measure of the amount of mass in a given volume
Weight A measure of the gravitational force
Physical Property Characteristic of a substance that can be observed and measured without changing the identity of the substance
Chemical Property Describes a substance's 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 Occurs when one or more substances change into entirely new substances with different properties.
Law of Conservation of Mass States that ordinary chemical and physical changes mass is not created or destroyed but is only transformed into a different substance
Atom The smallest unit of 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 Mixture is one that does not have a uniform composition
Homogeneous When you add sugar to a cup of water it dissolves
Solid Substance has a definite volume and shape
Liquid Substance has a definite volume but not a definite shape
Gas Particles are close together and can slide past each other
Freezing Change in state when a liquid becomes a solid
Melting Change in state from a solid to a liquid
Evaporation When particles gain enough energy that they become a gas
Boiling A rapid change from a liquid to a gas
Condensation Change in state from a gas to a liquid
Deposition Change from gas to a solid
Sublimation Change from a solid to a gas
Created by: 18mujanics0229
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