Unit 2.3 Test Review

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

• cooking an egg

• water evaporating

• a metal bike rusting

• digestion in the stomach

Based on Ashley’s observations, what statement can she make about the solubility of the three materials?

• Salt is the least soluble.

• Sand is the least soluble.

• Flour is the most soluble.

• Sand is the most soluble.

Tags

NGSS.MS-PS1-2

Ethan is heating a substance and observes that it turns from a brown solid to a black powder. He then measures the properties of each and finds they are different. Which option below best summarizes Ethan's observation?

• The brown solid changed color and size when he added heat, so he observed a physical change.

• The brown solid became a new substance when he added heat, so he observed a physical change.

• The brown solid became a new substance when he added heat, so he observed a chemical change.

• The brown solid changed color when he added heat, so he observed matter being destroyed by a chemical change.

Tags

NGSS.MS-PS1-2

When a substance in a closed system changes from a liquid to a gas, which of the following describes the mass of the changed substance?

• The mass increases.

• The mass decreases.

• The mass becomes zero.

• The mass does not change.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5

Kayla combines a black liquid and a clear liquid. She observes that the two liquids do not mix. Kayla allows the mixture to settle for 30 minutes. Which of the statements below best describes the properties of the two liquids?

• A. The clear liquid is less dense than the black liquid.

• B. The clear liquid is more dense than the black liquid.

• C. The volume of the clear liquid is less than the black liquid.

• D. The volume of the clear liquid is greater than the black liquid.

Tags

NGSS.MS-PS1-2

Which trial would result in the slowest chemical change?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

If Density = Mass / Volume, what is the density of the key?

• 60 g/mL

• 20 g/mL

• 1.13 g/mL

• 0.05 g/mL

Ernesto is given two samples of wood as shown below. He needs to determine if the samples are the same type of wood. Which property should Ernesto measure?

• The mass because it will depend on the size of the sample.

• The volume because it will depend on the size of the sample.

• The weight because it does not depend on the size of the sample.

• The density because it does not depend on the size of the sample.

A principal wants to replace the playground equipment after several students complained of suffering burns on a hot day. The table provides information on several material options.

Which material should the principal choose to prevent future burns?

• Iron because it is the strongest due to its density.

• Stainless steel because it has the greatest density.

• Plastic because it has the lowest thermal conductivity.

• Aluminum because it has the greatest thermal conductivity.

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2

NGSS.MS-PS1-2

NGSS.MS-PS3-3

Which of the following best describes density?

• The amount of matter an object contains.

• The amount of volume an object takes up.

• The amount of gravitational force acting on an object.

• The amount of matter within a specific amount of volume.