# Balancing equations (FT only)

This lesson, students will write chemical formulae using knowledge of ion charges and balance equations using the same number of atoms rule.

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.The formula of sodium chloride is NaCl. Calculate the relative formula mass of sodium chloride. Relative atomic masses: Na = 23; Cl = 35.5

1/5

Q2.The formula of magnesium sulfate is MgSO₄. Calculate the relative formula mass of magnesium sulfate. Relative atomic masses: Mg = 24; S= 32; O = 16.

2/5

Q3.Calculate the relative formula mass of iron oxide, Fe₂O₃. Relative atomic masses: O = 16; Fe = 56.

3/5

Q4.A chemist was asked to identify a nitrogen compound. The chemist carried out an experiment to find the relative formula mass (Mr) of the compound. The Mr of the compound was 44. Relative atomic masses: N = 14; O = 16. What is the formula of the compound?

4/5

Q5.Calculate the percentage of O in Be(OH)₂. Be = 9; O = 16; H = 1.

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.The formula of sodium chloride is NaCl. Calculate the relative formula mass of sodium chloride. Relative atomic masses: Na = 23; Cl = 35.5

1/5

Q2.The formula of magnesium sulfate is MgSO₄. Calculate the relative formula mass of magnesium sulfate. Relative atomic masses: Mg = 24; S= 32; O = 16.

2/5

Q3.Calculate the relative formula mass of iron oxide, Fe₂O₃. Relative atomic masses: O = 16; Fe = 56.

3/5

Q4.A chemist was asked to identify a nitrogen compound. The chemist carried out an experiment to find the relative formula mass (Mr) of the compound. The Mr of the compound was 44. Relative atomic masses: N = 14; O = 16. What is the formula of the compound?

4/5

Q5.Calculate the percentage of O in Be(OH)₂. Be = 9; O = 16; H = 1.

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:

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# 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:

# Balancing equations

This quiz will test your knowledge from this lesson

## Question 5

Q1.What is the formula of sodium chloride? sodium ion= Na⁺ and chloride ion = Cl⁻

1/5

Q2.Which of the following equations is balanced?

2/5

Q3.Which of the following equations is balanced?

3/5

Q4.Which number is missing to balance the equation: ___ C + O₂ → 2CO

4/5

Q5.Which number is missing to balance the equation : MgO + ___HCl → MgCl₂ + H₂O

5/5

Quiz:

# Balancing equations

This quiz will test your knowledge from this lesson

## Question 5

Q1.What is the formula of sodium chloride? sodium ion= Na⁺ and chloride ion = Cl⁻

1/5

Q2.Which of the following equations is balanced?

2/5

Q3.Which of the following equations is balanced?

3/5

Q4.Which number is missing to balance the equation: ___ C + O₂ → 2CO

4/5

Q5.Which number is missing to balance the equation : MgO + ___HCl → MgCl₂ + H₂O

5/5

# Lesson summary: Balancing equations (FT only)

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