REVIEW
Key terms
IN YOUR GROUPS, SEE HOW MANY TERMS YOU
CAN DEFINE…
• Matter
Chemistry
• Chemical property
• Molecule
• Volume
Element
Compound
• Heterogeneous
Substance
Atom
Chemical bond
Chemical Formula
Homogeneous
Density
Physical property
Mixture
Weight
Physical change
Mass
Chemical change
• Law of Conservation of Mass
Temperature
• Thermal energy
Endothermic
Exothermic
• Chemical energy
Potential energy
Kinetic energy
MATTER
• Anything that has mass and takes up
space…all of the stuff…it’s all matter
CHEMISTRY
• The study of matter and how matter
changes
SUBSTANCE
• A single kind of matter that is pure…always
has a specific composition
PHYSICAL PROPERTY
• A characteristic of a substance that can be
observed without changing it into another
substance
CHEMICAL PROPERTY
• A characteristic of a substance that
describes its ability to change into
difference substances
ELEMENT
• A substance that cannot be broken down
into any other substances by chemical or
physical means
ATOM
• The basic particle from which all elements
are made
CHEMICAL BOND
• A force of attraction between two or more
atoms
MOLECULE
• A group of two or more atoms held together
by chemical bonds
COMPOUND
• A substance made of two or more elements
that are chemically combined in a set ratio
CHEMICAL FORMULA
• Symbol representation showing the
elements in compound and the ratio of
atoms
MIXTURE
• Two or more substance that are together in
the same place, but the atoms are not
chemically bonded
HETEROGENEOUS
• Mixture where you can usually see the
different parts and they are easily
separated out
HOMOGENEOUS
• Mixture where the substances are evenly
mixed so it is difficult to see the different
parts
WEIGHT
• A measure of the force of gravity
MASS
• The amount of matter in an object
VOLUME
• The amount of space matter occupies
DENSITY
• A measure of the mass of a material in a
given substance…how tightly packed
matter is in an object
PHYSICAL CHANGE
• An alteration of the form or appearance of
matter but does not turn any substance in
the matter into a different substance
CHEMICAL CHANGE (REACTION)
• A change in matter that produces one or
more new substances
LAW OF CONSERVATION OF MASS
• Matter cannot be created nor destroyed in
any chemical or physical change
TEMPERATURE
• A measure of how hot or cold something is
THERMAL ENERGY
• The total energy of the motion of all of the
particles in an object
ENDOTHERMIC
• A change in which energy is absorbed
(gets cold)
EXOTHERMIC
• A change in which energy is released (gets
hot)
CHEMICAL ENERGY
• The energy stored in the chemical bonds
between atoms
POTENTIAL ENERGY
• Energy that is stored
KINETIC ENERGY
• Energy of motion and movement