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8th Unit 1b

Matter & Atoms

TermDefinition
Atomic number The number of protons found in the nucleus of an atom of an element
Atom The smallest unit of an element that maintains the characteristics of that element
Boiling point The point at which a substance changes phase from a liquid to a gas.
Chemical Change When one substance combines with another to form a new substance
Compound Two or more elements that are chemically combined to form a new substance
Density The amount of matter per volume. Measured by dividing the mass of an object by its volume.
Element A pure chemical substance consisting of one type of atom distinguished by the numberof protons contained in its nucleus
Gas A state of matter that is a compressible fluid which will conform to the shape of its container but it will also expand to fill the container.
Law of conservation of matter Matter is not created or destroyed it can only change its form.
Liquid A fluid state of matter that can't be compressed easily, that conforms to the shape of its container, but retains a (nearly) constant volume independent of pressure.
Melting point The point at which a substance changes phase from a solid to a liquid.
Mixtures Two or more substances that are physically combined where the characteristics of the individual substances are retained
Molecules Two or more elements that are chemically bonded together
Periodic table An organized chart of chemical elements based on the number of protons contained in the nucleus of the atoms of each element
Physical change Changes affecting the form of a chemical substance, but do not change the chemical composition of that substance.
Plasma A high energy state of matter taking the form of gas-like clouds or ion beams
Precipitate A solid that forms when a substance comes out of solution
Solid A low energy state of matter that has a definite shape and a definite volume.
Matter Anything that has mass and takes up space
Solution A type of mixture in which one substance is dissolved into another
Mass The measurement of the amount of matter that an object contains
Solute The substance in a solution that is dissolved.
Solvent The substance in a solution that is not dissolved.
Homogeneous mixture A mixture in which the substances are evenly mixed
Heterogeneous mixture A mixture in which the substances are not evenly mixed
Electron The particle of atom found orbiting the nucleus that has a negative charge
Proton The particle in an atoms nucleus that has a positive charge
Neutron The particle in an atoms nucleus that does not have a charge
Created by: darrin_evans