Changes of State

How does thermal energy play a role in particle motion and changes of state?

• Thermal energy is a term that refers to temperature

• Increasing an object's thermal energy increases particle motion and can cause a change of state.

• Decreasing an object's thermal energy increases particle motion and can cause a change of state.

• Thermal energy is the energy added from a heat source.

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NGSS.MS-PS1-4

What happens to particles during changes of state between solid and liquid.

• Particles move so fast they break from their fixed position.

• Particles melt and become a liquid.

• Particles find a circular orbit around an atom's nucleus.

• Particles stop vibrating and change into their liquid form.

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NGSS.MS-PS1-4

What is a main difference between boiling and evaporation?

• Boiling requires an outside power source and the evaporation process is internal.

• Evaporation takes place at one temperature, boiling takes place at all temperatures.

• Boiling takes place at one temperature, evaporation takes place at all temperatures.

• Boiling takes can only occur through mechanical methods.

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NGSS.MS-PS1-4

Boiling a liquid...

• Has the opposite effect of evaporating a liquid.

• Happens at a lower temperature at a lower altitude.

• Decreases pressure inside of the liquid.

• Increases pressure inside of the liquid.

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The reverse of vaporization is...

• Condensation

• Sublimation

• Deposition

• Alienation

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Condensation occurs when...

• Liquid is condensed into a solid.

• Water vapor becomes snow at high altitudes.

• As a liquid is heated to boiling.

• Vapor is cooled on a surface.

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NGSS.MS-PS1-4

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An example of sublimation is..

• Dry ice turning into CO2

• Water Freezing

• Dry ice turning into H2O

• Lava erupting from a volcano

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NGSS.MS-PS1-4

Pressure effects changes of states because...

• Particles confined to a smaller space can move less freely.

• Particles are unable to change states under immense pressure.

• Particles confined to a smaller space are able to change state with less thermal energy.

• Pressure increases the thermal energy of particles.

Tags

NGSS.MS-PS1-4

Melting point is a way to identify an unknown material.

• True

• False

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

Water temperature will stop increasing as ice is melting.

• True

• False

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