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The Nature of Matter Part II
How Matter Changes
20
Science
4th Grade
03/19/2008

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Term
physical change
Definition
a change in the way matter looks WITHOUT changing it into a new kind of matter
Term
examples of physical change
Definition
changes in size, shape, color, state
Term

thermal energy

Definition

the total energy of the particles of matter; the energy of the moving particles; a measure of how hot or cold matter is

Term
heat
Definition
the flow of thermal energy from a warmer area to a cooler area
Term
temperature
Definition
a measure of how hot or cold matter is
Term
thermometer
Definition
a tool used to measure temperature
Term
degree
Definition
the unit of measure that thermometers use to measure temperature
Term

degrees Celcius

Definition

a scale used to measure temperature - it is used in countries like Spain, France, and Germany

Term
degrees Fahrenheit
Definition
a scale used to measure temperature; it is used in the United States
Term
change in state
Definition
a PHYSICAL change in the appearance of matter (NEW matter is NOT formed)
Term

mixture

Definition
matter made up of two or more substances that are combined PHYSICALLY(this is a PHYSICAL change)
Term
solution
Definition
a mixture in which the particles of one kind of matter are mixed EVENLY with the particles with other kinds of matter
Term
dissolve
Definition
to mix COMPLETELY by separating into particles that cannot be seen
Term
solubility
Definition
a measure of how much of a substance can disSOLve into another substance
Term
chemical change
Definition
a change in matter that produces NEW kinds of matter with DIFFERENT properties
Term
chemical reaction
Definition
another term for a chemical change (a change in matter that produces NEW kinds of matter with DIFFERENT properties)
Term
reactant
Definition
the matter that you START with in a chemcial reaction or chemical change
Term
product
Definition
the NEWLY formed matter that is a RESULT of a chemical reaction (or chemical change)
Term
types of energy involved in chemical reactions (or chemical changes)
Definition
thermal, light, electricity, sound, motion
Term
energy
Definition
the ability to cause change
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