Banner: Jan Baptiste Van Helmont was a careful observer of nature; it can be inferred that from his analysis of data gathered in his experiments suggested he had a concept of the conservation of mass. He performed an experiment to determine where plants get their mass. He showed that the mass did not come from nutrients in the soil. We now know that most of the mass comes from carbon dioxide in the air.
PHOTOLAB
Experiment 1 - Effect of changing temperature on the number of oxygen bubbles
Experiment 2 - Effect of the colour of light on the number of bubbles
Experiment 3 - Effect of the amount of carbon dioxide on the number of bubbles
Experiment 4 - Effect of the light intensity on the number of bubbles
Experiment 1 - Effect of changing temperature on the number of oxygen bubbles
- Have light intensity (white light) and CO2 at a maximum
- Change the temperature by clicking on the thermometer
- Record your results in a table and draw a graph
Experiment 2 - Effect of the colour of light on the number of bubbles
- Have temperature, light intensity and CO2 at a maximum
- Change the the colour of light by clicking on the lamp switch
- Record your results in a table and draw a bar chart
Experiment 3 - Effect of the amount of carbon dioxide on the number of bubbles
- Have temperature and light intensity (white light) at a maximum
- Change the the amount of CO2 by clicking on the bottle
- Record your results in a table and draw a bar chart
Experiment 4 - Effect of the light intensity on the number of bubbles
- Have temperature and CO2 at a maximum. Use white light.
- Change the the light intensity using the dimmer switch above the bulb
- Record your results in a table and draw a line graph
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