Heat Transfer AP Chemistry

Match Definition to Term:

Heat of Fusion

• The difference in energy between the solid and liquid states for a given amount of substance

• The difference in energy between the liquid and gas states for a given amount of substance

• The energy associated for a 1 degree temperature change for a given amount of a substance

Match Definition to Term:

Specific Heat

• The difference in energy between the solid and liquid states for a given amount of substance

• The difference in energy between the liquid and gas states for a given amount of substance

• The energy associated for a 1 degree temperature change for a given amount of a substance

Match Definition to Term:

Heat of Vaporization

• The difference in energy between the solid and liquid states for a given amount of substance

• The difference in energy between the liquid and gas states for a given amount of substance

• The energy associated for a 1 degree temperature change for a given amount of a substance

For Water H_f = 6.01 kJ mol^-1 and H_v = 40.14 kJ mol^-1. Find the energy change associated with boiling 10g of water.

• 22.3 kJ

• 401 kJ

• 60.1 kJ

• 3.34 kJ

Tags

NGSS.HS-PS3-4

For Water H_f = 6.01 kJ mol^-1 and H_v = 40.14 kJ mol^-1. Find the energy change associated with freezing 10g of water.

• -60.1

• -3.34 kJ

• 3.34 kJ

• 22.3 kJ

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

Mercury and Bromine are the two elements that exist as liquids in their standard state. The H_v of Mercury is 59.38 kJ mol^-1 and of Bromine is 30.91 kJ mol^-1. What best explains why Mercury's is higher?

• Mercury has a high boiling point

• Mercury has a higher molar mass

• The total IMF's are higher in Mercury

• Bromine has a smaller density

A 100 g sample of a metal was heated to 100^oC and then quickly transferred to an insulated container holding 100 g of water at 22^oC. The temperature of the water rose to reach a final temperature of 35^oC. Choose all that are true.

• The metal lost more energy than the water gainer

• The amount of energy lost by the metal is equal to the energy gained by the water

• The metal must have a higher specific heat than the water

• The water must have a higher specific heat than the metal

Tags

NGSS.HS-PS3-4

A solid sample of compound was heated at a constant rate and the changing temperature was recorded. What best explains why the slope of R is less than the slope of T?

• The heat capacity of the gas state is greater than the liquid state.

• The heat capacity of the liquid state is greater than the gas state.

• The heat capacity of the solid state is greater than the liquid state.

• The heat of vaporization is greater than the heat of fusion

Tags

NGSS.HS-PS3-4

In a calorimetry experiment buring 1g of Hot Takis caused 100g of water to go from 20 to 28 ^oC. Burning 5g of Laffy Taffy caused 300g of water to from 25 to 33 ^oC. What can be concluded about the energy content of both substances?

• 1g of Takis releases less energy than 1g of Laffy Taffy

• 1g of Takis releases more energy than 1g of Laffy Taffy

• 1g of Takis has the same energy content as 5g of Laffy Taffy

• Not enough information to compare Takis to Laffy Taffy

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

Which would be the correct way to estimate the change in enthalpy for H₂ + Cl₂ --> 2HCl

• 430 + 240 - 430

• (2 x 430) - 240 - 430

• 430 + 240 + (2 x 430)

• 430 + 240 - (2 x 430)

Tags

NGSS.HS-PS1-4