Exploring Phase Changes and Energy Dynamics

What is the main focus of phase changes in this video?

• Chemical reactions

• Energy changes

• Atomic structure

• Electromagnetic waves

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which process requires energy to be put into the system?

• Melting

• Deposition

• Condensation

• Freezing

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NGSS.MS-PS1-4

What is the heat of fusion?

• Energy required to change a liquid to a gas

• Energy required to change a solid to a liquid

• Energy required to change a gas to a solid

• Energy required to change a liquid to a solid

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NGSS.MS-PS1-4

Why is the heat of vaporization typically larger than the heat of fusion?

• Because it involves cooling the substance

• Because it involves forming new bonds

• Because it involves breaking some intermolecular forces

• Because it involves breaking all intermolecular forces

Tags

NGSS.MS-PS1-4

What is the term for the energy required to change a solid directly to a gas?

• Heat of fusion

• Heat of vaporization

• Heat of sublimation

• Heat of condensation

Tags

NGSS.MS-PS1-4

Which phase change is exothermic?

• Melting

• Vaporization

• Sublimation

• Condensation

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What happens to the molecules during an endothermic process?

• They slow down

• They stay the same

• They speed up

• They form new bonds

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

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How do intermolecular forces affect phase changes?

• They only affect gases

• They have no effect

• Weaker forces make phase changes easier

• Stronger forces make phase changes easier

Tags

NGSS.MS-PS1-4

What remains constant during a phase change in a heating curve?

• Mass

• Temperature

• Volume

• Pressure

Tags

NGSS.MS-PS1-4

Which formula is used to calculate the heat absorbed or released during a temperature change?

• q = c * delta H

• q = m * delta T

• q = m * c * delta T

• q = m * delta H

Tags

NGSS.MS-PS3-4