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An investigation to show the effects of changing the concentration of hydrogen peroxide on the rate of catalyst

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Introduction

An investigation to show the effect of changing the concentration of hydrogen peroxide on the reaction rate of catalyst. Title of investigation An investigation to show how the concentration of substrate affects the reactivity of hydrogen peroxide. Theory behind experiment The theory behind the experiment is to evaluate how our human bodies react with enzymes. They can be found in food products such as apple, yeast, liver. We used these products in our first preliminary experiment to see which ones would be most reliable for our further investigation. Prediction I predict that the results of this experiment will show that the higher the concentration of the hydrogen peroxide, the more gas will be produced from the reaction. This is because at higher concentration there are more molecules in the hydrogen peroxide, and there being more molecules in the substance means that the molecules are much more likely to collide. So the higher the concentration of the hydrogen peroxide the more gas will be given off, 20% concentration of hydrogen peroxide will give off the most gas and 5% concentration of hydrogen peroxide will give off the least gas is what I predict. An investigation to show the effect of changing the concentration of hydrogen peroxide on the reaction rate of catalyst. Aim The aim of my investigation is to find out if changing the concentration of substrate will affect the rate (speed) ...read more.

Middle

Yeast for the reaction. Scales to measure the amount of yeast on. A test tube holder for the test tube to stand on. A plastic measuring cylinder full of water to see how much water was lost from the oxygen being emitted. Delivery tube/bung for the oxygen to access through from the test tube to the measuring cylinder. A stop watch to time the experiment. An investigation to show the effect of changing the concentration of hydrogen peroxide on the reaction rate of catalyst. Method Weigh out 0.59g of yeast on the measuring balance. Add the yeast to a boiling tube. Measure out 4ml of hydrogen peroxide. Fill a measuring cylinder with cold water right to the brim. Get a piece of plain paper and slip it over the top of the measuring cylinder. Pick up a water trough. Fill it half full with cold water. Get some goggles to protect your eyes. Get a stop watch to time the length it takes to react. Get a bung and a delivery tube and attach them to each other. Get a pipette. Place your hand over the top of the measuring cylinder. Rotate it 180 degrees so it is upside down then place it in to the water trough. Carefully remove the paper from under the tube. Using the pipette measure out the hydrogen peroxide. ...read more.

Conclusion

If I had to make a change to do this investigation for the second time I would make sure the same person was putting the bung in the test tube and the delivery tube under the measuring cylinder so it was about the same time difference. I would measure the yeast more accurately as we may have added more or less at certain points which would have caused outliers. We would check that there were no air bubbles in the measuring cylinder. I think that to make my results more accurate and reliable the main thing that would have to be done is to cut down on human errors by making each test as similar as possible to make results more reliable .There isn?t anything else that would change the experiment drastically if it was altered. Time 10 20 30 40 10 20 30 40 Ml of h202 4ml 13 30 41 50 15 34 49 53 13 32 45 53 12 31 44 56 8ml 21 30 47 59 26 32 44 60 25 32 43 57 27 33 39 62 12ml 15 29 34 40 16 30 36 39 14 31 36 40 10 33 39 42 An investigation to show the effect of changing the concentration of hydrogen peroxide on the reaction rate of catalyst. An investigation to show the effect of changing the concentration of hydrogen peroxide on the reaction rate of catalyst. Lock & key hypothesis ...read more.

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This account is only of average standard because not enough correct or specific scientific terminology is used.

Marked by teacher Adam Roberts 20/05/2013

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