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8th Unit 2

Matter Key Terms

QuestionAnswer
Physical Change A change that does not require the breaking and forming of chemical bonds.
Chemical Change A change that occurs when chemical bonds are made or broken to create new substances
Chemical Bond An attractive force linking atoms
Substance Matter; a physical material
Disolve To mix within a liquid and pass into solution
Evaporate To convert or change from a liquid to a vaper
Property A characteristic that can be used to identify a substance
Chemical Property A property that describes the potential to undergo some sort of chemical change, such as combustion or a change in pH
Physical Property A property that can be observed without chemically altering a substance, such as color or mass
Acid A substance with a pH lower than 7
Base A substance with a pH higher than 7
pH "Potential of hydrogen" - a measure of the acidity or alkalinity of a solution
Magnetic Able to attract iron and steel objects
Law of conservation of mass Matter cannot be created or destroyed; it can only be changed
Mass The amount of mater, or the amount of "stuff" measured in grams
Matter Anything that has mass and takes up space
Product A chemical substance formed as a result of a chemical reaction
Reactant An original substance involved in a chemical reaction
Ballanced Having two sides that are equal to one another; in a state of equilibrium.
Electron Cloud The part of the atom that has all the orbiting electrons
Element The simplest substance made up of only one type of atom
Orbit To revolve around something, such as electrons around the nucleus of an atom
Neural Neither positive nor negative
Nucleus the central part of an atom that contains protons an neutrons
Periodic Table An arrangement of elements according to their atomic numbers
Horizontal flat or level; Parallel to the ground
Group A vertical column in the periodic table
Period A horizontal row in the periodic table
Vertical Upright; perpendicular to the horizon
Created by: darrin_evans