Chemical formulae

This lesson explains how to write and interpret chemical formula and how to calculate relative formula mass.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

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 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Q1.Why do some atoms gain electrons?

1/8

Q2.Which group of elements on the periodic table are not reactive?

2/8

Q3.Revision - what charge does a proton have?

3/8

Q4.Revision - what charge does an electron have?

4/8

Q5.If an atom gains an electron, what charge ion will it form?

5/8

Q6.If an atom loses two electrons, what charge ion will it form?

6/8

Q7.What is the correct definition for an ion?

7/8

Q8.Revision - a magnesium atom contains 12 electrons. What is its electron configuration?

8/8

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

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 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Q1.Why do some atoms gain electrons?

1/8

Q2.Which group of elements on the periodic table are not reactive?

2/8

Q3.Revision - what charge does a proton have?

3/8

Q4.Revision - what charge does an electron have?

4/8

Q5.If an atom gains an electron, what charge ion will it form?

5/8

Q6.If an atom loses two electrons, what charge ion will it form?

6/8

Q7.What is the correct definition for an ion?

7/8

Q8.Revision - a magnesium atom contains 12 electrons. What is its electron configuration?

8/8

Video

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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.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Chemical Formulae

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Q1.Revision - argon has an atomic number of 18 and a mass number of 40. How many neutrons does an atom of argon contain?

1/7

Q2.How many elements are there in HNO₃?

2/7

Q3.How many atoms are there in HNO₃?

3/7

Q4.Rubidium is in group 1 of the periodic table. What charge ion will it form?

4/7

Q5.Oxygen is in group 6 of the periodic table. What charge ion will it form?

5/7

Q6.A compound contains 1 magnesium atom and 2 chlorine atoms. What is the chemical formaulae of the compound.?

6/7

Q7.What is the relative formula mass of CH₄? (The relative mass of carbon is 12 and the relative mass of hydrogen is 1).

7/7

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Chemical Formulae

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Q1.Revision - argon has an atomic number of 18 and a mass number of 40. How many neutrons does an atom of argon contain?

1/7

Q2.How many elements are there in HNO₃?

2/7

Q3.How many atoms are there in HNO₃?

3/7

Q4.Rubidium is in group 1 of the periodic table. What charge ion will it form?

4/7

Q5.Oxygen is in group 6 of the periodic table. What charge ion will it form?

5/7

Q6.A compound contains 1 magnesium atom and 2 chlorine atoms. What is the chemical formaulae of the compound.?

6/7

Q7.What is the relative formula mass of CH₄? (The relative mass of carbon is 12 and the relative mass of hydrogen is 1).

7/7

Lesson summary: Chemical formulae

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