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Ch. 2 Holt


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