Atom - Answers the smallest component of an element having the chemical properties of the
element, consisting of a nucleus containing combinations of neutrons and protons and one or
more electrons bound to the nucleus by electrical attraction; the number of protons determines
the identity of the element.
Compound - Answers (chemistry) a substance formed by chemical union of two or more
elements or ingredients in definite proportion by weight
Heterogeneous mixture - Answers a mixture in which different materials can be distinguished
easily
Pure substance - Answers a sample of matter, either a single element or a single compound,
that has definite chemical and physical properties
Homogeneous mixture - Answers a mixture in which substances are evenly distributed
throughout the mixture
Element - Answers an artifact that is one of the individual parts of which a composite entity is
made up
Solution - Answers a homogeneous mixture of two or more substances
Suspension - Answers a mixture in which fine particles are suspended in a fluid where they are
supported by buoyancy
Colloid - Answers a mixture with properties between those of a solution and fine suspension
physical property - Answers A characteristic of a pure substance that can be observed without
changing it into another substance
Viscosity - Answers resistance of a liquid to sheer forces (and hence to flow)
Conductivity - Answers the ability of a material to allow either heat or electricity to flow through
it
Malleability - Answers the ability of a substance to be hammered or beaten into thin sheets
Melting point - Answers the temperature at which a solid becomes a liquid
Boiling point - Answers the temperature at which a substance changes from a liquid to a gas
Filtration - Answers a process that separates materials based on the size of their particles
Distillation - Answers a process used to separate dissolved solids from a liquid, which is boiled
to produce a vapor that is then condensed into a liquid
, Physical change - Answers a change of matter from one form to another without a change in
chemical properties
Chemical property - Answers A characteristic of a pure substance that describes its ability to
change into different substances
Flammability - Answers the ability of a substance to react in the presence of oxygen and burn
when exposed to a flame
Reactivity - Answers the ability of a substance to combine chemically with another substance
Chemical change - Answers a change that occurs when one or more substances change into
entirely new substances with different properties
Precipitate - Answers to fall as moisture; to cause or bring about suddenly; to hurl down from a
great height, to give distinct form to; characterized by excessive haste; moisture; the product of
an action or process
solid - Answers matter with a definite shape and volume
liquid - Answers matter that has a definite volume but no definite shape
Gas - Answers matter that does not have a definite shape or volume
Kinetic energy - Answers energy of motion
Pressure - Answers the amount of force exerted per unit area of a surface
Absolute zero - Answers The coldest temperature, 0 Kelvin, that can be reached. It is the
hypothetical temperature at which all molecular motion stops.
Phase change - Answers the reversible physical change that occurs when a substance changes
from one state of matter to another
Endothermic - Answers describes a reaction that absorbs energy from the surroundings
Exothermic - Answers chemical reaction in which energy is primarily given off in the form of
heat
Vaporization - Answers liquid to gas
Condensation - Answers The change of state from a gas to a liquid
Sublimation - Answers solid to gas
Deposition - Answers gas to solid
Proton - Answers positively charged particle