Review of Physical and Chemical Changes

Front

On way to school one morning, students saw snow on the ground. On the way home, students noticed that there was less snow and a puddle of water. Which argument best supports the claim that the snow changed to water due to the increasing temperature during the day?

• Some of the snow changed to water because the temperature rose steadily from below freezing to above freezing throughout the day.
• Some of the snow changed to water because the surrounding environment became more humid as the day progressed.
• Some of the snow changed to water because it was exposed to sunlight for an extended period of time.
• Some of the snow changed to water because the temperature dropped steadily from above freezing to below freezing throughout the day.

Back

Some of the snow changed to water because the temperature rose steadily from below freezing to above freezing throughout the day.

Front

Which container had a chemical change? Observations: 1. Baking soda + water 2. Baking soda + vinegar 3. Water only

Back

Container 2 had a chemical change because there is a temperature change.

Front

What is a common observable evidence of a chemical change?

Back

Production of a new substance.

Front

Which of the following is an example of a chemical change?

• Ice melting
• Sugar dissolving in water
• Baking a cake
• Freezing water

Back

Baking a cake

Front

If a new substance is produced during an investigation, it is most likely due to...

Back

Chemical change

Front

If a strong odor is detected during an investigation, it may suggest:

Back

Chemical change

Front

If no observable evidence of a chemical change is detected, it may mean:
- Only chemical change occurred
- Only physical change occurred
- No changes occurred
- Evidence was missed

Back

Only physical change occurred

Front

What is an example of a physical change? Options: Burning wood, Rusting iron, Melting ice, Baking a cake

Back

Melting ice

Front

Which of the following is a physical change that involves a change in state?

• Digesting food
• Mixing salt and water
• Boiling an egg
• Photosynthesis

Back

Boiling an egg

Front

What happens to water particles when they are cooled?

Back

They slow down and move closer together