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# photosynthesis I predict that as I move the lamp away from the pondweed the rate of reaction will decrease

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Introduction

An investigation to find out the effect of light on photosynthesis Aim: to find out if light affects the rate of photosynthesis. Theory Carbon dioxide + water light + chlorophyll glucose + oxygen 6co2 + 6h2o c6h12o6 + 6o2 Photosynthesis is a chemical reaction in which plants use carbon dioxide, water, light energy and chlorophyll to create glucose and oxygen for their food. Limiting factors * Low temperature * Shortage of carbon dioxide * Shortage of light * Chlorophyll * Water Temperature Temperature is a limiting factor; as the temperature increases the particles move faster which makes them collide more. Thus causing more successful reactions and the rate Is made faster. Carbon dioxide Carbon dioxide is needed for the equation to work and is needed to create glucose. Light Light is needed in photosynthesis to provide the initial energy to start the equation off. ...read more.

Middle

New are going to do this by using the same volume of water the same piece of pond weed and use 1 spatula of sodium hydrogen carbonate each time. Key variables The one thing I am going to change is light intensity. I will change it by moving a lamp different distances away from the experiment. I will measure the rate of reaction by counting the number of oxygen bubbles given off. Prediction I predict that as I move the lamp away from the pondweed the rate of reaction will decrease. This is because light is needed in photosynthesis. Diagram Method Set apparatus up as show in diagram. Put sufficient amount of water into the boiling tube and one spatula of sodium hydrogen carbonate and place the lamp 0cm away from the experiment. ...read more.

Conclusion

Evaluation My results did not show any noticeable anomalous data, which shows it was quite an accurate test. Main errors How this might of effected my results How I could put this error right Different sized bubbles If the bubbles where larger they could contain more oxygen Collect oxygen and measure the volume Cant count all bubbles May have missed a few bubbles which could change my results Collect the oxygen and measure volume Heat from sun could effect heat of experiment More heat could create make photosynthesis occur faster Use water bath for experiment There are a fair amount of things I could of changed to make the experiment more effective however with no anomalous results and the fact my prediction was correct it seems that my experiment was accurate enough. I did many things to keep my test reliable and all in all it was a success. Alex Flaherty 11y ...read more.

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