PS Unit 3 Lesson 2 Self Check

Sweating is one way the body cools itself. Which statement best explains this cooling process?

• Water condenses on the skin, adding thermal energy to the body.

• Water from the body evaporates from the skin, removing thermal energy from the body.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which situations model a process similar to sweating? Select all that apply.

• water droplets forming on the outside of a glass of ice water

• a wet bandana around the neck of a hiker

• wet clothes hanging on a clothes line

• a hot, moist towel placed on sore muscles to soothe them

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which weather conditions would most likely cause the fog as shown in the photo?

• rapidly cooling air that is low in water vapor

• rapidly cooling air that is high in water vapor

• rapidly warming air that is low in water vapor

• rapidly warming air that is high in water vapor

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NGSS.MS-ESS2-4

NGSS.MS-ESS2-5

Complete the explanation of how clouds form.

Clouds and fog form under similar conditions. Air pressure at higher altitudes affects the formation of clouds. As air rises, the reduced pressure allows the air to expand and cool until water vapor ​ (a)   into water droplets that form the clouds.

• condenses
• freezes
• evaporates

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NGSS.MS-ESS2-4

As snow slowly melts in the sunshine, what is happening to the particles of water that make up the snow? Select all that apply.

• Particles are gaining energy.

• Particle motion is decreasing.

• Particle motion is increasing.

• Particles are losing energy.

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NGSS.MS-PS1-4

NGSS.MS-PS3-5

Think about what happens when a change of state takes place. Which statements are true? Select all that apply.

• A change of state involves changes in energy.

• When a change of state takes place, the identity of a substance changes.

• During a change of state, the same number of particles make up a substance before and after the change.

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NGSS.MS-PS1-4

Which describes the change in motion and kinetic energy of the particles as thermal energy is added to a liquid? Select all that apply.

• As thermal energy is added, the particles move faster and faster.

• As thermal energy is added, the kinetic energy of the particles increases.

• If enough thermal energy is added, the attractive forces between particles become so strong that the particles are pulled close together.

• If enough thermal energy is added, the particles gain enough energy to overcome particle attractive forces, break free, and change from liquid to gas.

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NGSS.MS-PS1-4

NGSS.MS-PS3-5

Which describes the change in motion and kinetic energy of the particles as thermal energy is removed from a liquid? Select all that apply.

• s thermal energy is removed, the kinetic energy of the particles increases.

• As thermal energy is removed, the particles slow down until they lock into place as a solid and only vibrate in place.

• As thermal energy is removed, the kinetic energy of the particles decreases.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

Complete the sentences to explain why liquid particles at a high pressure need more energy to change to a gas than liquid particles at a low pressure need.(Answers can be used more than once)

With an increase in pressure, more particle collisions occur at the surface. This exerts ​ (a)   force on the liquid particles. So, ​ (b)   energy is needed for the liquid particles to break free and become a gas.

• more
• less

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NGSS.MS-PS1-4

NGSS.MS-PS3-4