Matter can exist in three states - solid, liquid, and gas. The state depends on how closely packed the molecules are and how freely they can move. In solids, molecules are tightly packed and can only vibrate. In liquids, molecules have some space between them and move more freely. Gas molecules are most spaced out and move freely in any direction. Increases in temperature cause molecules to move faster and spread out more, potentially changing the state from solid to liquid to gas. Decreases in temperature have the opposite effect, causing molecules to slow down, pack closer together, and potentially change the state from gas to liquid to solid.

1. Changes affected by
temperature

2. Matter can be solid, liquid and gas. Matter is made
up of very small particles called molecules.
These molecules are always moving because they
contain energy.

3. Molecules are the smallest particles that make up matter.
Energy is the ability to cause or to do work.

5. The molecules of a solid are close together and are held
tightly bound to one another. They cannot move freely
and can only vibrate. This is why solids have a definite
shape.
(to vibrate is to move continuously and rapidly to and
fro.)

6. Liquid molecules have some spaces between them. They
move more freely and are spaced farther apart compared
with the molecules in a solid. They take the shape of their
container.

7. Gas molecules are spaced even farther apart and move
more freely in any direction compared with liquid
molecules. They take the shape of their container as well.

8. A change in state occur when there is an increase or decrease in
temperature.
Increase of temperature(heat): the molecules move faster and the
space between the molecules becomes bigger. That is the time
the molecules of the object become farther apart.
Matter change from liquid state to
a gas state.

9. Decrease of temperature: the molecules move slower. The space
between molecules become smaller and the molecules become
closer together. These change are observed when matter
experiences lower temperatures. Energy is lost and matter
changes from liquid state to a solid state. The same occur when
matter changes from gas state to liquid state.

10. 1. Melting
2. Evaporation
3. Sublimation
4. Condensation
5. Freezing

11. Melting
Melting occurs when matter changes from solid to
liquid.