# Lesson Worksheet: Specific Latent Heat Physics • 9th Grade

In this worksheet, we will practice using the formula E = mL to calculate the amount of energy absorbed or released by a change in the state of a material.

Q1:

1 kg of copper and 1 kg of nickel are both heated continuously at the same rate. Determine which metal will completely melt first. Use a value of 205 kJ/kg for the specific latent heat of fusion of copper and use a value of 297 kJ/kg for the specific latent heat of fusion of nickel.

• ACopper
• BNickel

Q2:

Which of the following is the correct unit for the specific latent heat of fusion?

• AJ/kg
• B
• CJ⋅kg
• Dkg/J
• E

Q3:

Water in a pan reaches , but the pan is still left on the heat, so eventually all of the water turns to water vapor. Calculate the energy needed to evaporate the 1.2 kg of water contained by the pan. Use a value of 2,258 kJ/kg for the specific latent heat of vaporization of water. Give your answer to the nearest kilojoule.

Q4:

Which of the following is the correct formula for the energy required to evaporate a substance? represents the energy required, represents the mass of the substance, represents the specific latent heat of vaporization, represents the specific heat capacity, and represents the change in temperature.

• A
• B
• C
• D
• E

Q5:

A 10 g cube of ice at is placed outside in direct sunlight on a hot day. The sunlight and the hot air around the cube heat it at a rate of 10 W. It takes 5.56 minutes for the ice to completely melt. Calculate the specific latent heat of fusion for water. Give your answer to 3 significant figures.

Q6:

565 kJ of energy is used to melt a block of zinc that was already at its melting temperature when the energy was supplied to it. Find the mass of the block of zinc, using a value of 113 kJ/kg for the specific latent heat of fusion of zinc.

Q7:

The table lists the specific latent heat of fusion for various metals. A student has 200 g of an unknown metal. The student heats the metal to its melting point and then measures how much energy is absorbed by the metal for all of it to melt, and gets a value of 79.6 kJ. Which of the four metals listed in the table does the student have?

 Metal Specific Latent Heat of Fusion (kJ/kg) Aluminum Cobalt Iron Nickel 398 276 272 297
• AAluminum
• BCobalt
• CIron
• DNickel

Q8:

30 g of molten gold is allowed to solidify. It releases 1,890 J of energy to the surrounding environment as it does so. What is the specific latent heat of fusion for gold?

Q9:

A metal at the temperature at which it melts is heated until all of the metal has become liquid. It takes 41 kJ to completely melt the metal, and its mass is 0.2 kg. What is the specific latent heat of fusion of the metal?

Q10:

A substance, which is initially at and solid, is heated. The temperature of the substance is recorded over time, and this data is shown in the graph.

What is the melting point of the substance?

This lesson includes 7 additional questions for subscribers.
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