Science Unit 2 Materials Can Change

____________ is a measurement of how hot or cold something is.

• Heating

• Temperature

• Cooling

• Reversible

_______________ materials make them warmer.

• Cooling

• Heating

______________ materials, or making them less hot, can cause change.

• Cooling

• Heating

Some changes to materials caused by heating and cooling are _______________, meaning they can change back.

• cool

• heat

• reversible

• temperature

Which of the following are reversible? Check all that apply.

• water

• popsicle

• candle

• egg

• popcorn

Which of the following are not reversible? Check all that apply.

• water

• popcorn

• candle

• egg

• chocolate

Ellie says that water can change from a liquid to a solid and then back into a liquid. She investigates her idea to see if it is true. Ellie has a cup of water sitting in sunlight. She puts the cup of water into the freezer. The next day, Ellie takes the cup out of the freezer. The water inside the cup is ice. She puts the cup in sunlight. After a few hours, the water is liquid. The table lists what Ellie sees during this investigation.

Tell what causes the changes to water that Ellie sees in her investigation.

Ellie says that water can change from a liquid to a solid and then back into a liquid. She investigates her idea to see if it is true. Ellie has a cup of water sitting in sunlight. She puts the cup of water into the freezer. The next day, Ellie takes the cup out of the freezer. The water inside the cup is ice. She puts the cup in sunlight. After a few hours, the water is liquid. The table lists what Ellie sees during this investigation.

Tell about how Ellie’s investigation shows that her idea is true or not, using the table.