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16 terms

Chapter 2 Matter study guide

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chemistry
the scientific study of the composition, structure, and properties of matter and the changes that matter undergoes
matter
anything that has mass and takes up space
element
a substance that cannot be seperated or broken down into simpler substances by chemical means
atom
the smallest unit of an element that maintains the properties of that element
compound
a substance made of atoms of two or more different elements that are chemically combined
molecule
the smallest unit of a substance that keeps all of the physical and chemical properties of that substance
chemical formula
a combination of chemical symbols and numbers to represent a substance
pure substance
a sample of matter, either a single element or a single compound, that has definite chemical and physical properties
mixture
a combination of two or more substances not chemically combined
melting point
the temperature and pressure at which a solid becomes a liquid
boiling point
the temperature at which a liquid becomes a gas
density
the ratio of the mass of a substance to the volume of a substance
reactivity
the ability of a substance to combine chemically with another substance
flammability
the ability of a substance to react in the presence of oxygen and burn when exposed to a flame
physical change
a change of matter from one form to another without a change in chemical properties
chemical change
a change that occurs when a substance changes composition by forming one or more new substances