This document provides information about the states of matter and phase changes. It includes diagrams showing the particle models of solids, liquids and gases. Students are asked to identify each state and explain how they know. Later passages provide information about melting points, boiling points, and the roles of adding and removing heat energy in changing states of matter. Students are asked to identify phase changes in diagrams and describe molecular motion during heating and cooling.

1. Day 1
These diagrams show atoms or molecules of a gas, a solid and a liquid. Tell
which model shows each state of matter and explain how you know.
1 1. Shows molecules or atoms of a ________. I know that because _______
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2 2. Shows molecules or atoms of a ________. I know that because _______
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3 3. Shows molecules or atoms of a ________. I know that because _______
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Day 2
1. Fill in the blanks with “add heat energy” or “take away heat energy.”
a. To change a solid to a liquid you have to _________________________________.
. b. To change a liquid to a solid you have __________________________________.
c. To change a gas to a liquid you have to _________________________________.
d. To change a liquid to a gas you have to _________________________________.
2. The melting point of a substance is the
3. The boiling point of a substance is the
4. The melting point of ice water is ________ degrees Celsius.
5. The boiling point of liquid water is _______ degrees Celsius.
6. When you leave butter out in the hot sun it will
a. melt
b. change from a solid to a liquid
c. boil
d. change in shape
e. a and c
f. a,b and d
Day 3
Shade in the Shade in the
melting/freezing boiling point for
point for water on water on the
the Celsius Celsius
thermometer on thermometer on
the right. the right

2. Day 4
On Monday morning at 9:00 am you placed two cans with the same amount of water outside. You
placed one can out in the open. and one under a tree. It was sunny all day Monday and Tuesday.
On Tuesday at 3:00 pm you checked the two cans. You observed that there was less water in
both cans than on Monday. You also noticed the can under the tree had more water than the one in
the open. Some of the water in cans A and B ___________________. These water molecules
are now part of the air as water ______________. There is more water left in the can under the tree
because _________________________________________________________________
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Day 5
1. Label each picture as showing melting, freezing, or evaporation.
2. Below each picture write adding heat energy or taking away heat energy.
3. When you add heat energy the molecules move ___________________
and ________________________________________.
4. When you take heat energy away, the molecules move _______________________
and _________________________________.