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8th Grade Chemistry

Terms from 8th grade chemistry

Atom The basic building block of most ordinary matter.
Element A substance made up of only one type of atom.
Nucleus The center of an atom.
Proton A positively charged subatomic particle.
Neutron A subatomic particle that has no charge.
Electron A negatively charged subatomic particle.
Electron Cloud The area outside the atomic nucleus where electrons are located.
Energy Level The part of the electron cloud where an electron is most likely to be found.
Atomic Number The number of protons in the nucleus of an atom.
Neutral Having no electrical charge.
Atomic Mass The number of protons and neutrons in the nucleus of one atom of an element.
Chemical Symbol A one-or two-letter code used to represent an element.
State of Matter The physical form in which matter exists; solid, liquid, gas, or plasma.
Solid A substance with definite shape and volume.
Liquids A substance that has a definite volume but no definite shape.
Gas A substance that has neither a definite shape nor a definite volume.
Plasma A state of matter that consists of a mixture of electrons and positive ions.
Melting point The temperature at which a liquid begins to change to a solid.
Vaporization The process in which a liquid changes to a gas.
Boiling Point The temperature at which a liquid begins to change to a gas.
Condensation The process in which a gas turns into a liquid.
Freezing Point The temperature at which a liquid begins to change into a solid.
Density The mass of a substance per unit of volume.
Physical Property A characteristic of matter that can be observed or measured without changing the identity of a substance.
Chemical Property A characteristic that determines how a substance will interact with other substances during a chemical reaction.
Reactivity How likely an atom is to react with atoms of other elements to form compounds.
Physical Change A change that alters the physical properties of a substance without changing the identity of the substance.
Chemical Change The changing of one substance into a new substance with different properties.
Chemical Reaction The process by which new substances form during a chemical change.
Precipitate A solid formed by a chemical reaction that takes place in solution.
Combustion Reaction A chemical reaction in which oxygen combines with certain other substances and heat and light are given off.
Created by: kmk3n