1. Carbon dioxide in the atmosphere
Starter
If I am the answer, what is the question?
Which process puts carbon dioxide into the atmosphere?
Which process takes carbon dioxide out of the atmosphere?

2. Respiration ______ carbon dioxide into the atmosphere
Respiration is a chemical reaction that happens in all living cells. It is the way that energy is released from ______, for our cells to use to keep us functioning.
glucose + oxygen   →   carbon dioxide + _____ (+ energy)
Respiration ______ carbon dioxide into the atmosphere
Water releases glucose

3. Respiration: testing for carbon dioxide
Breathe out into the limewater – what do you notice?
Write two sentences in your book:
When I exhaled into the limewater, it …
This shows that there is ______________ in my breath.

4. Combustion releases carbon dioxide into the atmosphere.
Fuels (oil, wood, etc) are substances that react with oxygen to release useful energy. Most of the energy is released as heat, but light energy is also released.
hydrocarbon + oxygen    →    carbon dioxide + water
Combustion releases carbon dioxide into the atmosphere.

5. Photosynthesis
Green plants absorb light energy using chlorophyll in their leaves. They use it to react carbon dioxide with water to make a sugar called glucose. The glucose is used in respiration, or converted into starch and stored. Oxygen is produced as a by-product.
Photosynthesis is the only process which takes carbon dioxide out of the atmosphere

6. The carbon cycle
You each have an A4 sheet of paper on your desk
Write your name on the top of the piece of paper then put your pen down
You will have one minute to memorise as much as you can of the image on the board
You will have one minute to note down as much as you can
Then you pass your drawing to the person sitting next to you
Write your name on the paper handed to you
You have 10 seconds to look at what the person has drawn
One minute looking at the board
One minute improving the drawing
Repeat once more
We will mark as a class – merits if any picture
you have contributed to is fully correct!

7. Write your name on the paper
Pens down
Eyes facing forwards

9. Draw what you remember

10. Pass your paper to the person sitting to your left
Write your name on the paper
Pens down
Eyes facing forwards

12. Draw what you remember

13. Pass your paper to the person sitting to your left
Write your name on the paper
Pens down
Eyes facing forwards

15. Draw what you remember

16. Check the diagram handed to you
9 marks for the arrows GIVE A MARK OUT OF 14
5 marks for the explanations

17. Where is most of the carbon on Earth stored?

18. This shows that water becomes more ______ when it absorbs CO2
The water represents the _________
Before we exhaled, the colour of the UI was _____, showing that distilled water is _______.
Exhaled air (air we breathe out) contains higher levels of carbon dioxide than the air we breathe in because the process of ________ takes place in our cells, in order to release ________
When the carbon dioxide entered the water, the colour of the UI changed to ______.
This shows that water becomes more ______ when it absorbs CO2

19. Plenary: the carbon cycle
Match up the boxes to form four full sentences in your book
Carbon dioxide levels in the Earth’s atmosphere…
… carbon locked up long ago is released as carbon dioxide
Plants and oceans are known as…
… were kept steady by the natural recycling of carbon dioxide in the environment
When we burn fossil fuels…
As carbon dioxide levels rise…
… the reactions of carbon dioxide in sea water increase
… carbon dioxide sinks