Investigation 7/8 Test

A group of students placed three equal sized-cubes of butter, cheese, & wax on a plate. They tested the hardness of each cube by gently pressing down on top of each cube and recorded their observations. They left the cubes under a warm lamp for 1 hour. They returned and tested the hardness again and recorded their results. Below is their table. In which substance(s) did the particles speed up. Pick the best answer.

• Only the butter
• The butter and the cheese, but not the wax
• All of the substances
• None of the substances

Tags

NGSS.MS-PS1-4

The melting/freezing point of mercury is -39°C. A scientist put liquid mercury into a freezer that is kept at a constant temperature of -35°C. Will the liquid mercury freeze?

• Yes, because the freezer is cold enough to freeze mercury
• No, because the freezer isn't cold enough to freeze mercury
• Yes, because the particles will slow down enough for the mercury to freeze
• No, because there is not energy in the freezer to freeze the mercury

Tags

NGSS.MS-PS1-4

A student dissolved 20 g of salt in a cup of water. She left the cup uncovered in an area where nobody could touch it. When she returned to the cup 10 days later, she found all the water was gone, and there were crystals in the bottom of the cup. What is the best conclusion, based on her observations?

• There water, evaporated, and there is 20 g of salt in the cup
• The water evaporated, but some salt is left in the cup
• There was a chemical reaction, and a new solid was left behind
• The water and salt separated and then the water evaporated, but there is not way to know what is left in the cup.

Tags

NGSS.MS-PS1-2

Mrs. Stallings hangs a wet shirt on a clothesline. A bit later, the shirt is dry. What happens to the water particles as the shirt dries?

• The water particles are absorbed by the shirt
• The water particle evaporate, forming a cloud
• The water particles disappear and no longer exist
• The water particles move faster and become part of the air

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Freezing point is the temperature at which a substance will melt.

• True
• False

Tags

NGSS.MS-PS1-4

Heating materials without touching is called________________.

• kinetic energy
• conduction
• thermal energy

Tags

NGSS.MS-PS3-3

The melting point and freezing point for a substance are ___________

• different
• the same
• opposites

Tags

NGSS.MS-PS1-4

How can you tell if water vapor is present in the air?

• Touch it
• Feel it
• Smell it

What is is called when water vapor goes directly to ice?

• Evaporation

• Condensation

• Deposition

Tags

NGSS.MS-ESS2-4

Pick yes for each action that happens to particles when substances change from liquid to solid; pick no for actions that are not possible

Groups:

(a) Yes

,

(b) No

• The particles change from soft to hard

• The kinetic energy of the particles changes

• The particles change into a new substance.

• The particles change shape

• The particles are held more strongly to one another

Tags

NGSS.MS-PS1-4