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Ch. 2 Holt

Matter

TermDefinition
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 separated 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 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 that are 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
re activity the ability of a substance to combine chemically with another substance
flammability the ability 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
Created by: haasem