Physical & Chemical Changes

In physical changes, substances might change in __________ but not in __________.

• appearance, composition
• volume, state of matter
• texture, color
• weight, mass

What happens to atoms after a chemical change?

• They remain in the same place.
• They become bigger.
• They link up in different ways.
• They dissolve to form a mixture.

Which of the following properties can change during a physical change?

• shape

• pH level

• flammability

• reactivity

True or False: a physical change may produce a new substance.

• True
• False

Tags

NGSS.MS-PS1-4

Which of the following is an example of a precipitate?

• liquid evaporating into gas
• a solid formed from a frozen liquid
• a chunk solid formed from two liquids combining
• a liquid solution that contains two substances

Tags

NGSS.MS-PS1-2

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

• sugar and oxygen reacting to produce water and carbon dioxide
• honey dissolving in tea
• a raw egg being cooked
• metal rusting after being left out in the rain

A physical change can sometimes result in a color change. Which of the following situations show this?

• Milk turns yellow when it spoils.
• Dough becomes darker when it is baked into cake.
• A red candy dissolves and turns water pink.
• A match turns black when it is burned.

Which of the following physical changes shows a change in a substance's state of matter?

• a piece of paper being torn in half
• clay being molded into a bowl
• an ice cube being crushed
• liquid water becoming steam

A pH change can be evidence that --

• a substance has changed physically.
• a substance's state of matter has changed.
• no change has taken place.
• a substance has changed chemically.

On a camping trip, Mrs. Benavides roasts a marshmallow in the campfire. She notices that the roasted marshmallow smells and tastes differently than the uncooked marshmallows. What change has taken place, and how does Mrs. Benavides know?

• a chemical change because the marshmallow changed in taste, color and smell
• no change because the marshmallow is not a new substance
• only a physical change because the marshmallow changed in size
• a chemical change because the marshmallow only changed in pH level