anything that has mass and takes up space
a substance that cannot be separated or broken down into simpler substances by chemical means
the smallest unit of an element that maintains the chemical properties of that element
a group of atoms that are held together by chemical forces; the smallest unit of matter that can exist by itself and retain all of a substance’s chemical properties
a substance made up of atoms of two or more different elements joined by chemical bonds
pure substance
a sample of matter, either a single element or a single compound, that has definite chemical and physical properties
a combination of two or more substances that are not chemically combined
heterogeneous mixture
a mixture in which the substances are not evenly distributed
homogeneous mixture
a mixture in which the substances are evenly distributed
physical properties
characteristics that can be observed without changing the identity of the substance
melting point
the temperature and pressure at which a solid becomes a liquid
boiling point
the temperature and pressure at which a liquid becomes a gas
the ratio of the mass of a substance to the volume of the substance
the capacity of a substance to combine chemically with another substance
chemical property
how a substance changes into a new substance, either by combining with other elements or by breaking apart into new substances
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
formula for density
formula for volume

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