# Multi-Step energy calculations

In this lesson we will look at how to solve energy problems involving both specific heat capacity and latent heat.

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.Revision - internal energy is the sum of which two stores of energy?

Select two (2) boxes

1/7

Q2.Revision - which state of matter has the most internal energy?

2/7

Q3.Revision - which store of energy increases when a substance changes state?

3/7

Q4.What is the definition for latent heat of fusion?

4/7

Q5.What is the unit for latent heat?

5/7

Q6.Which two changes of state correspond to the latent heat of vapourisation (pick two)?

Select two (2) boxes

6/7

Q7.Which two changes of state correspond to the latent heat of fusion (pick two)?

Select two (2) boxes

7/7

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.Revision - internal energy is the sum of which two stores of energy?

Select two (2) boxes

1/7

Q2.Revision - which state of matter has the most internal energy?

2/7

Q3.Revision - which store of energy increases when a substance changes state?

3/7

Q4.What is the definition for latent heat of fusion?

4/7

Q5.What is the unit for latent heat?

5/7

Q6.Which two changes of state correspond to the latent heat of vapourisation (pick two)?

Select two (2) boxes

6/7

Q7.Which two changes of state correspond to the latent heat of fusion (pick two)?

Select two (2) boxes

7/7

# Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

• Click "Close Video"
• Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

# Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

Quiz:

# Multi-step energy calculations

This is assessing your understanding of the previous topics and the topics covered in the multi-step energy calculations lesson.

Q1.Revision - what is the unit for latent heat?

1/7

Q2.Revision - which two changes of state correspond to the latent heat of vapourisation (pick two)?

Select two (2) boxes

2/7

Q3.Revision - which two changes of state correspond to the latent heat of fusion (pick two)?

Select two (2) boxes

3/7

Q4.What is the equation for calculating mass when given the specific latent heat and energy transferred?

4/7

Q5.What is the equation for calculating specific latent heat when given the energy transferred and mass.

5/7

Q6.How would you work out the total thermal energy required to melt 1 kg of ice at -10 °C?

6/7

Q7.For the last question, calculate the total thermal energy transferred to the ice cube to completely melt it. Specific heat capacity of ice = 2100 J/kg°C and specific latent heat of fusion of ice = 334000 J/kg.

7/7

Quiz:

# Multi-step energy calculations

This is assessing your understanding of the previous topics and the topics covered in the multi-step energy calculations lesson.

Q1.Revision - what is the unit for latent heat?

1/7

Q2.Revision - which two changes of state correspond to the latent heat of vapourisation (pick two)?

Select two (2) boxes

2/7

Q3.Revision - which two changes of state correspond to the latent heat of fusion (pick two)?

Select two (2) boxes

3/7

Q4.What is the equation for calculating mass when given the specific latent heat and energy transferred?

4/7

Q5.What is the equation for calculating specific latent heat when given the energy transferred and mass.

5/7

Q6.How would you work out the total thermal energy required to melt 1 kg of ice at -10 °C?

6/7

Q7.For the last question, calculate the total thermal energy transferred to the ice cube to completely melt it. Specific heat capacity of ice = 2100 J/kg°C and specific latent heat of fusion of ice = 334000 J/kg.

7/7

# Lesson summary: Multi-Step energy calculations

## Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Walk

On the spot:
Dance