The atmosphere – Photosynthesis (3 experiments)

Reprocessing /The subsequent processing
1. Discuss in the group what happened with the temperature.
2. What happened to the temperature on the thermometer under the Glass container compared to the thermometer which was outside the Glass container.
3. How does this experiment illustrate the processes which happen in connection with the greenhouse effect?
4. The atmosphere – Photosynthesis
We know, that the level of CO2 in the atmosphere, has influence on the temperature on the planet.
(See The Greenhous Effect: https://climatekids.nasa.gov/greenhouse-effect/).

In the following row of experiments, we are going to explore the photosynthesis and combusting:

Oxygenic photosynthesis is written as follows:
6CO2 + 6H2O + Light Energy → C6H12O6 + 6O2
Here, six molecules of carbon dioxide (CO2) combine with 6 molecules of water (H2O) using light energy. The end result is the formation of a single carbohydrate molecule (C6H12O6, or glucose) along with six molecules each of breathable oxygen and water.

Combusting:
C6H12O6 + O6 → 6CO2 + 6H2O + Energy

Experiment 1:
Put 4 ml of CO2 indicator into a freezing-bag.
Note the colour of the indicator:
Breathe into the bag, – tie a knot and shake.
Note the colour of the indicator:

Explain:

Experiment 2:
Put 4 ml of CO2 indicator in a glass-jar.

Note the colour of the indicator:
Place a candle in the jar and light it.
Tie the lit or put a plate over the jar.

What happens to the light?
Why?
Shake the jar and note the colour of the indicator:

Experiment 3:

Take 2 test tubes, – mark them A & B.

lamp fig

Put a branch of water thyme in each tube.

Add 2 ml of CO2 indicator.
Test tube A.
Add tap-water and cork the test tube.

Note the colour of the CO2 indicator:

Wrap the test tube in tin-foil.

Test tube B.

test tubes

Add carbonized mineral water and cork the test tube.

Note the colour of the CO2 indicator:
Place the tubes under a light source for at least one hour.
Look at the test tubes and describe what has happened

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