Changes in Matter

What happens when a physical change occurs?

• color or state changes and a new substance is formed

• color or state changes, but a new substance is not formed

• shape, size or state changes and a new substance is formed

• shape, size or state changes, but a new substance is not formed

Which is a physical change?

• baking a cake

• freezing water

• burning wood

• lighting fireworks

When boiling water, what type of physical change will occur?

• It will condense.

• It will freeze.

• It will evaporate.

• It will melt.

Which of the following statements BEST describes why the image shows an example of a physical change?

• The water is changing color from cloudy to clear. This means a new substance is forming.

• The water is changing its temperature. This means a new substance is forming.

• The water is changing its state from solid to liquid. There is no new substance forming.

• The water is changing its state from solid to liquid. This means a new substance is forming.

Which of the following examples shows a physical change?

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Which two phases occur when you heat something up? (Choose 2)

• freezing

• evaporation

• condensation

• melting

Maliah likes to go in the sauna. There is a mirror in the sauna that has to be wiped all the time because there is so much water on it. Which statement BEST describes why there is water on the mirror.

• The steam collects on the mirror and then evaporates.

• The steam collects on the mirror and then boils.

• The steam collects on the mirror and then gets cooler, causing condensation.

• The steam collects on the mirror and then gets warmer, causing condensation.

Sam made an origami. When did he see a physical change occur?

• Sam got paper from his closet.

• Sam folded the paper to form an origami frog.

• Sam showed his mom his origami.

• Sam displayed it in his room.

Jana walked outside early one morning. She stepped on the grass barefoot and noticed it was wet. Why did she feel the grass wet if it hadn't rained?

• The hot air caused water outside to evaporate.

• The energy from the sun caused water to heat up and evaporate.

• The cold temperature caused water to condense from a gas to a liquid state.

• The cold from the grass caused the water to freeze into a solid.

When does a chemical change occur?

• When there is a change in the shape of a substance

• When there are one or more new substances with new properties formed

• There is a change in a state of a substance

• There is a large increase in the size of the substance