Physical Science

5. Danielle pours lemon juice over a tablespoon of baking soda. At first, many bubbles form, but then they slowly stop forming. What is the BEST clue that this is a chemical change and not a physical change?

• a. The bubbles stop forming

• b. Bubbles form without heating the liquid

• c. The lemon juice and baking soda form a mixture

• d. The mixture can be separated

Tags

NGSS.MS-PS1-2

10. When a liquid changes to a solid, it is called the ______________________________ point.

• Melting

• Freezing

• Boiling

Tags

NGSS.MS-PS1-4

16. Spoiled milk:

• Physical Change

• Chemical Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

14. Melting butter for popcorn:

• Physical Change

• Chemical Change

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

4. Which mixture could you BEST separate with a filter?

• a. Salt and pepper

• b. Rocks and wood shavings

• c. Sugar and iron filings

• d. Sand and water

13. A wooden log burning in a fire:

• Physical Change

• Chemical Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

20. Two students are making S’mores. Student 1 says that making S’mores is a physical change because the graham crackers, marshmallow, and chocolate are simply a mixture. Student 2 says that making S’mores is a chemical change because the marshmallow begins to burn when you place it in the fire and becomes dark and crispy on the outside. Who is correct and why?

• a. Student 1 is correct.

• b. Student 2 is correct.

• c. Both students are correct because making S’mores is a physical change when you put the substances together, but a chemical change also occurs when the marshmallow burns.

• d. Student 2 is correct because once the crackers, marshmallow, and chocolate are placed together, the mixture cannot be reversed again.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

2. Holly has a cube of sugar. She crushes it into powder. What has changed about the sugar?

• The mass

• The weight

• The shape

• The shape and the mass

17. A chemical change is easier to reverse than a physical change.

• True

• False

12. A clay snake is made from a ball of clay:

• Physical Change

• Chemical Change