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unit 1 lessons 1-6

vocabulary energy and matter

matter anything that has mass and takes up space
mass describes the amount of matter in an object
weight a measure of gravitational force of an object
volume the amount of space that an object takes up or occupies
densiy 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 describes 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 substance.
chemical charge happens when one or more substances change into entirely new substances with different properties
law of conservation mass states that ordinary chemical and physical changes, mass is not created or destroyed but is only transformed into different substances.
atom the smallest unit of elements
element one or more of the same kind of atom chemically combined
compound different kinds of atoms chemically combined
mixture contains a variety of elements and compounds that aren't chemically combined with each other
pure substances a sample matter either a single element or a single compound.
heterogeneous a uniform position
homogeneous same sweet taste from sugar-water mixture
solid substance that has a definitive volume and shape
liquid substance has a definitive volume but not definite shape
gas does not have a definite volume or shape
freezing when liquid turns into a solid
melting the temperature at which the substance change
evaporation some particles gain enough energy that they escape the surface of the earth
boiling a rapid change from a liquid to a gas
condensation the reverse of evaporation
physical change changing shape and size
chemical change not changing size and shape
Created by: 18bmusleh0302