# Reacting masses and yield (GCSE Chemistry)

This lesson, students will use a balanced equation to work out the quantity of reacting elements needed to produce a specified product and predict the mass of a product from a specified starting mass. Yield is also covered.

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!

## Question 5

Q1.What type of reaction happens when a compound breaks down due to heating?

1/5

Q2.Iron oxide + aluminium → iron + aluminium oxide. If there is 160 g of iron oxide, 54 g of aluminium and 112 g of aluminium oxide, what is the mass of iron produced?

2/5

Q3.H₂ (g) + Cl₂ (g) → 2HCl (g). Starting with 2 g of hydrogen, what mass of hydrogen chloride would be produced? (Relative atomic masses: H = 1; Cl = 35.5)

3/5

Q4.What mass of magnesium oxide is formed when 12g of magnesium reacts with oxygen? 2Mg + O₂ → 2MgO

4/5

Q5.What mass of aluminium oxide is produced when 13.5g of aluminium is burned in oxygen? 2Al + 3O₂ → Al₂O₃

5/5

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!

## Question 5

Q1.What type of reaction happens when a compound breaks down due to heating?

1/5

Q2.Iron oxide + aluminium → iron + aluminium oxide. If there is 160 g of iron oxide, 54 g of aluminium and 112 g of aluminium oxide, what is the mass of iron produced?

2/5

Q3.H₂ (g) + Cl₂ (g) → 2HCl (g). Starting with 2 g of hydrogen, what mass of hydrogen chloride would be produced? (Relative atomic masses: H = 1; Cl = 35.5)

3/5

Q4.What mass of magnesium oxide is formed when 12g of magnesium reacts with oxygen? 2Mg + O₂ → 2MgO

4/5

Q5.What mass of aluminium oxide is produced when 13.5g of aluminium is burned in oxygen? 2Al + 3O₂ → Al₂O₃

5/5

# 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:

# Reacting masses and yield (Triple)

This quiz will test your knowledge from this lesson and previous lessons.

## Question 5

Q1.What is the theoretical yield of a product?

1/5

Q2.H₂ (g) + Cl₂ (g) → 2HCl (g). Starting with 2 g of hydrogen, what mass of hydrogen chloride would be produced? (Relative atomic masses: H = 1; Cl = 35.5)

2/5

Q3.What mass of magnesium oxide is formed when 12 g of magnesium reacts with oxygen? 2Mg + O₂ → 2MgO

3/5

Q4.What mass of aluminium oxide is produced when 13.5 g of aluminium is burned in oxygen? 2Al + 3O₂ → Al₂O₃

4/5

Q5.Which of these is NOT a reason why the percentage yield is less than 100%?

5/5

Quiz:

# Reacting masses and yield (Triple)

This quiz will test your knowledge from this lesson and previous lessons.

## Question 5

Q1.What is the theoretical yield of a product?

1/5

Q2.H₂ (g) + Cl₂ (g) → 2HCl (g). Starting with 2 g of hydrogen, what mass of hydrogen chloride would be produced? (Relative atomic masses: H = 1; Cl = 35.5)

2/5

Q3.What mass of magnesium oxide is formed when 12 g of magnesium reacts with oxygen? 2Mg + O₂ → 2MgO

3/5

Q4.What mass of aluminium oxide is produced when 13.5 g of aluminium is burned in oxygen? 2Al + 3O₂ → Al₂O₃

4/5

Q5.Which of these is NOT a reason why the percentage yield is less than 100%?

5/5

# Lesson summary: Reacting masses and yield (GCSE Chemistry)

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