Phase Changes and Heat Formulas

• Mass

• Heat energy

• Temperature

• Volume

Tags

NGSS.HS-PS3-4

Which process involves the heat of fusion?

• Vaporization

• Condensation

• Melting

• Sublimation

Tags

NGSS.HS-PS3-4

Calculate the heat required to melt 10 grams of ice at 0°C. (Heat of fusion for ice = 334 J/g)

• 3340 J

• 334 J

• 33400 J

• 334000 J

Tags

NGSS.MS-PS1-4

Which of the following statements is true about the heat of vaporization?

• It is the energy required to melt a solid.

• It is the energy released when a gas condenses.

• It is the energy required to vaporize a liquid.

• It is the energy released when a solid freezes.

In a calorimetry experiment, if the temperature of water increases, what can be inferred about the heat exchange?

• The system absorbed heat.

• The system released heat.

• No heat exchange occurred.

• The system remained at constant temperature.

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

NGSS.HS-PS3-4

Which equation would you use to calculate the heat absorbed by a substance when it changes temperature without changing state?

Explain why breaking bonds requires energy.

• Because energy is released when bonds are broken.

• Because energy is absorbed to overcome the attractive forces between atoms.

• Because energy is conserved in the process.

• Because energy is released to form new bonds.

Tags

NGSS.HS-PS1-4

What is the primary difference between melting and freezing in terms of energy?

• Melting releases energy, while freezing absorbs energy.

• Both processes absorb energy.

• Melting absorbs energy, while freezing releases energy.

• Both processes release energy.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

If 500 J of energy is required to vaporize a liquid, how much energy is released when the same amount of vapor condenses?

• 500 J

• 250 J

• 1000 J

• 0 J

Tags

NGSS.MS-PS1-4

Which of the following best describes the process of condensation?

• A gas turning into a solid.

• A liquid turning into a gas.

• A gas turning into a liquid.

• A solid turning into a liquid.

Tags

NGSS.MS-PS1-4