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What is 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; all atoms of an element have the same atomic number
Atom the smallest unit of an element that maintains the chemical properties of that element
Molecule a group of atoms that are held together by chemical forces; a molecule is the smallest unit of matter that can exist by itself and retain all of a substance's chemical properties
Compound a substance made up of atoms of two or more different elements joined by chemical bonds
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
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
Melting point the temperature and pressure at which a solid becomes a liquid
Boiling point the temperature and pressure at which a liquid and a gas are in equilibrium
Density the ratio of the mass of a substance to the volume of the substance; commonly expressed as grams per cubic centimeter for solids and liquids and as grams per liter for gases
Reactivity the capacity of a substance to combine chemically with another substance
Flammability having the ability to burn in the presence of oxygen
Created by: bscanlan
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