Changes from Heat
Matter and Energy
Key Concept 1: Heating and cooling can cause matter
to change state.
Passage
A substance can change state when enough heat energy is ________________________
to it or subtracted from it. A substance changes state when its temperature
________________________. When heat energy is added to the substance, its particles
move ________________________ and farther apart. As the particle movement changes,
the substance turns from a solid to a ________________________. If more heat energy is
added and the _____________________ rises even more, a substance can then change
from a liquid to a gas. If you leave ice outside on a hot summer day, it will first melt and
become liquid water. That liquid water can then continue to be heated and changed to a
gas.
Word Bank:
added
slower
liquid
increases
faster
changes
gas
temperature
Illustration
Draw what would happen to a cup of water le1 outside on a hot summer day. 1
Changes from Heat
Matter and Energy
Key Concept 2: Heating causes matter to change state from
solid to liquid to gas, while cooling causes matter to change
state from gas to liquid to solid.
Passage
When enough heat energy is added to or subtracted from a substance, that
substance will change its state. If you add enough ___________________
energy to ice, it turns into __________________ water. If you add enough
heat energy to liquid __________________, it turns into a
________________ called water vapor. If you cool a substance by
subtracting heat energy, you can ________________ these changes. You
can turn a gas into a _______________ and a liquid into a ____________.
Changing from one state to another state is an example of a physical change.
Word Bank:
changes heat
water
solid
liquid
gas
temperature
reverse
Illustration
If heat caused a chocolate bar to melt, would you be able to reverse the change? Draw how this could be done. 2
Changes from Heat
Matter and Energy
Key Concept 3: We can predict, observe, and record
changes in states of matter.
Passage
Many people do not think that gold can ever exist as a gas, but it can! Almost all
substances can exist in all three states of matter. You probably are familiar with the
three states of water. Water can exist as a _________________ , as seen in ice.
Water can exist as a flowing _____________________. If heated, water can
become a ______________ known as water vapor. Just like with water, metals,
such as gold, can also undergo changes in states of matter. All you have to do to
change a substance from one state to another state is to ___________________ or
_________________ enough heat energy.
Word Bank:
increase
gas
liquid
solid
remove
states
matter
temperature
Illustration
Draw and label water in the three states of ma=er. 3