Lesson: Heat of Fusion

Physics

In this lesson, we will learn how to relate the mass conversion between solid and liquid states to net heating and the latent heat of fusion.

Sample Question Videos

10:25
03:42

Worksheet

Q1:

Some gun owners make their own bullets, which involves them melting lead and casting it into lead slugs. A 0.198 kg mass of lead at an initial temperature of is heated to its melting point temperature of and completely melted. Determine the heating required to do this. Use a value of for the specific heat capacity of lead and use a value of 24.5 kJ/kg for the specific latent heat of fusion of lead.

Q2:

To help prevent frost damage to a fruit tree, 4.00 kg of water at is sprayed onto the tree and allowed to freeze. The specific latent heat of fusion of ice is 334 kJ/kg.

How much is the tree heated due to the water freezing? Assume that all the energy lost by the water when it freezes heats the tree.

The tree has a mass of 200 kg and a specific heat capacity of . How much would the temperature of the tree have decreased if it had not been sprayed by water, assuming that no state changes occur in the matter of the tree as it cools?

Q3:

An ice cube has a mass of kg. The ice cube is placed inside a perfectly insulated container that holds 0.400 kg of water at an initial temperature of . Find the final temperature inside the container. Use a value of for the specific heat capacity of water and 334 kJ/kg for the specific latent heat of fusion of ice.

Preview Download