4.6 How Much Do You Know?

Why are some things so tiny that we can't see them without using special tools like magnifying glass?

• Because they are transparent, so we can't see them clearly.

• Because they have very few particles, making them hard to see.

• Because their particles are too small and close together.

• I don't know

Something changes its shape, size, or state, but it's still the same material. What made that change possible?

• Ice melting into water. Heat made it happen.

• Nothing in the world changes its shape, size or state.

• Water turning into ice. It got really cold.

• Wood turning into ashes. Fire made it happen.

What happens to the particles of a substance when it changes from a liquid to a solid?

• The particles move faster and spread out, turning into a gas.

• The particles break apart and form a liquid.

• I don't Know

• The tiny parts slow down and get closer together, making a solid.

Think about it: How can a model be used to demonstrate physical changes in matter, such as water transitioning from liquid to ice or vapor?

• Models can predict future changes in matter.

• Models can be used to explain the composition of matter.

• Models can simulate the process of matter changing states.

• Models are only used in art and not in science.