Heating and Cooling Curves Quiz

What happens when ice is taken out of the refrigerator?

• It freezes

• It sublimates

• It melts

• It evaporates

At what temperature does water freeze at 1 atm?

• 25 °C

• 100 °C

• 0 °C

• -10 °C

What does the y-axis represent in heating and cooling curves?

• Volume

• Pressure

• Mass

• Total heat changes

What is the heat of fusion (ΔHfus) of water?

• 6,000 J/mol

• 4,186 J/(g × °C)

• 40,700 J/mol

• 2,108 J/(g × °C)

In a heating curve, what do horizontal lines represent?

• Mass changes

• Pressure changes

• Phase changes

• Temperature changes

What is the specific heat of water?

• 2.108 J/(g × °C)

• 6,000 J/mol

• 4.186 J/(g × °C)

• 1.97 J/(g × °C)

What does segment AB in a heating curve represent?

• Boiling of water

• Change in temperature of ice

• Heating of steam

• Melting of ice

How is total heat calculated in phase transformations?

• By subtracting heat values

• By averaging heat values

• By adding all heat absorbed

• By multiplying heat values

What is the boiling point of water at 1 atm?

• 100 °C

• 150 °C

• 25 °C

• 0 °C

What is the formula for energy change during phase changes?

• q = mcΔT

• q = nRT

• q = nΔH

• q = mΔT