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Unit 1

Matter and Energy

TermDefinition
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; its value can change with the location of the object in the universe
volume the amount of space that an object takes up, or occupies
density the ratio of the mass of a substances 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 substance's 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 conversation of mass the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes
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 substances 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 volume or shape
freezing the change of state from a liquid to a solid
melting the change of state from a solid to a liquid
evaporation the change of state from a solid 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 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
Created by: 18hhomfeld0812
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