Ozone layer: a story of global success | Chemistry | Quizalize & Oak National Academy

Starter quiz

What is the molecular formula for an oxygen molecule?

O

O₂ ✓

O₃

O₄
Which of the following are an impact of increased levels of greenhouse gases in the atmosphere?

a 'hole' in the ozone layer

global warming ✓

volcanic eruptions
Why do humans wear sunscreen and sunglasses?

to provide protection from atmospheric ozone

to provide protection from harmful ultraviolet (UV) radiation ✓

to provide protection from infrared radiation

to prevent inhaling atmospheric pollutants
Which of the following is not a type of electromagnetic radiation?

ultraviolet radiation

infrared radiation

visible light

beta radiation ✓
Which elements does the molecule in the image contain?

hydrogen and carbon

chlorine, fluorine and carbon ✓

hydrogen, chlorine, fluorine and carbon

hydrogen, fluorine and carbon
Match the key term with the correct definition.

atmosphere

⇔

a layer of gas surrounding a planet ✓

ultraviolet (UV) radiation

⇔

a type of electromagnetic radiation which is emitted from the Sun ✓

chlorofluorocarbon

⇔

compound consisting of chlorine, fluorine and carbon only ✓

ozone layer

⇔

an area in the atmosphere where there is a high concentration of ozone ✓

Exit quiz

Which of the following caused a 'hole' in the ozone layer?

carbon dioxide

chlorofluorocarbons ✓

methane

carbon monoxide

hydrocarbons
What does CFCs stand for?

hydrochlorfluorocarbons

hydrofluorocarbons

chlorofluorocarbons ✓

hydrocarbons
CFCs were once used in which items?

fridges ✓

washing detergent

air conditioning ✓

carbon capture and storage

aerosol cans ✓
Why is the ozone layer important for life on Earth?

it absorbs higher frequency infrared radiation

it absorbs lower frequency infrared radiation

it absorbs shorter wavelength ultraviolet radiation ✓

it absorbs shorter wavelength microwave radiation
Which of the following are risks associated with ultraviolet radiation?

sunburn ✓

lung cancer

skin cancer ✓

cataracts ✓

heart disease
Look at the image and identify the group of compounds it belongs to.

chlorofluorocarbons

hydrochlorofluorocarbons

hydrocarbons

hydrofluorocarbons ✓

Worksheet

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Lesson Details

Key learning points

The ozone layer protects life from harmful ultraviolet (UV) radiation from the Sun.
Chlorofluorocarbons (CFCs) were once used, and when they entered our atmosphere reacted with ozone (O₃).
Ozone levels decreased, but scientific communication led to action being taken to prevent further loss of ozone.
The work of analytical scientists suggests the ozone layer is now reforming.

Common misconception

Ozone layer and climate change are linked/the same thing.

Ozone layer depletion was caused by human activity, but not through use of burning fossil fuels/greenhouse gas emissions. Both are atmospheric issues, but not the same issue.

Keywords

Ozone - Ozone is made up of oxygen atoms. It has the molecular formula O₃.
Ozone layer - The ozone layer refers to an area in the stratosphere where there is a high concentration of ozone.
Ultraviolet (uv) radiation - Ultraviolet (UV) radiation is a type of electromagnetic radiation which is emitted from the Sun.
Chlorofluorocarbons - Chlorofluorocarbons are compounds consisting of chlorine, fluorine and carbon atoms only.
Analytical scientists - Analytical scientists use a range of scientific techniques to study the chemical composition of substances.