Solution: a mixture in which substances are completely blended so that the properties are the same throughout and the substances stay blended.
Suspension: a mixture of substances that separate upon standing.
Colloid: particles (or droplets) large enough to block out light spread throughout another sustance.
Emulsion: a liquid spread through another liquid.
Aerosol: liquid drops or solid particles spread through a gas.
Gel: a solid spread throught a liquid.
Foam: a gas spread through a liquid or solid.
Chemical ChangesPhysical change: a change in size, shape, or state, without forming a new substance.
Chemical change: a change in matter that produces a new substance with different properties from the original.
Chemical reaction: a chemical change of original substances into one or more new substances.
Reactant: one of the original substances before a chemical reaction takes place.
Product: one of the new substances produced when a chemical reaction takes place.
Matter and Energy
Kinetic energy: the energy of a moving object.
Conduction: movement of energy from a hot object that comes into contact with a cooler object; the material remains in place.
Convection: movement of energy by the flow of matter from place to place.
Radiation: movement of energy in the form of waves that can travel through empty space.
Wet cell battery: a battery containing liquid solution that produces the electric current.
Dry cell battery: a battery that uses "dry chemicals" to produce an electric current.