Understanding Heat and Energy Changes

What is the definition of the heat of fusion?

• The amount of energy required to change a substance from solid to liquid at its melting point.

• The amount of energy required to change a substance from liquid to gas at its boiling point.

• The energy change associated with a chemical reaction.

• The energy required to raise the temperature of a substance by 1 degree Celsius.

Tags

NGSS.MS-PS1-4

How is the heat of vaporization calculated?

• By measuring the temperature change during a phase transition.

• By dividing the energy required to vaporize a substance by its mass.

• By multiplying the mass of the substance by its specific heat capacity.

Tags

NGSS.HS-PS3-1

What is the Gibbs Free Energy equation?

Which of the following criteria indicates a spontaneous reaction?

What is calorimetry used for?

• Measuring the heat of chemical reactions or physical changes.

• Calculating the speed of a chemical reaction.

• Determining the molecular weight of a compound.

• Measuring the pressure of a gas.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

Which phase change involves the heat of fusion?

• Solid to liquid

• Liquid to gas

• Gas to liquid

• Liquid to solid

Tags

NGSS.MS-PS1-4

What is the primary purpose of using calorimetry in experiments?

• To measure the volume of gases.

• To determine the heat transfer in chemical reactions.

• To calculate the density of liquids.

• To measure the pH of solutions.

Tags

NGSS.HS-PS3-4

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

• It is the energy required to convert a liquid into a gas at its boiling point.

• It is the energy required to convert a solid into a liquid at its melting point.

• It is the energy released when a gas condenses into a liquid.

• It is the energy required to raise the temperature of a liquid by 1 degree Celsius.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What does a negative Gibbs Free Energy change indicate about a reaction?

• The reaction is non-spontaneous.

• The reaction is at equilibrium.

• The reaction is spontaneous.

• The reaction is endothermic.

Which of the following is a phase change that involves the heat of vaporization?

• Melting

• Freezing

• Boiling

• Sublimation

Tags

NGSS.MS-PS1-4