Review of Physical and Chemical Changes

In a science class, students are investigating physical changes in matter. The teacher provides them with various dry and liquids materials. Which of the three investigations would be the most appropriate to observe a physical change?

• Use pretzels, chocolate candy, and nuts to make a trail mix

• Mix cooking oil with four, water, and salt and heat it in the stove.

• Add sugar to a tea mix to make it sweet.

• Separate sand and water using a filter.

• Mix baking soda and vinegar to observe the bubbles that form.

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.

Tags

NGSS.MS-PS1-4

Students in a science class are investigating to determine if a chemical change occurs. The students mix baking soda with water in one container, baking soda with vinegar in another container, and leave a third container with just water. They carefully observe the reactions in each container. Here are the observations recorded by the group.

Based on the investigation, which bottle had a chemical change?

• Container 3 is a chemical change because there was no temperature change.

• Container 1 is a chemical change because there is no temperature change.

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

• None of the containers demonstrated a chemical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a common observable evidence of a chemical change?

• Change in shape

• Change in size

• Change in texture

• Production of a new substance.

Tags

NGSS.MS-PS1-2

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

• Ice melting

• Sugar dissolving in water

• Baking a cake

• Freezing water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• Physical change

• Chemical change

• No change occurred

• Evaporation

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• No change occured

• Physical change

• Chemical change

• Erosion

Tags

NGSS.MS-PS1-2

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

Tags

NGSS.MS-PS1-2

What is an example of a physical change?

• Burning wood

• Rusting iron

• Melting ice

• Baking a cake

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

• Digesting food

• Mixing salt and water

• Boiling an egg

• Photosynthesis

Tags

NGSS.MS-PS1-4