• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10

Investigate one of the fastest enzyme reactions in nature - This reaction involves the breakdown of hydrogen peroxide (a poison) by an enzyme (catalase) into non-poisonous water and oxygen.

Extracts from this document...


Results to show 30mls of hydrogen peroxide to 0mls water Time 1st Result 2nd Result Average result 1 3 5 4 2 5 6 5.5 3 6 8 7 4 8 10 9 5 10 11 10.5 6 11 12 11.5 7 12 13 12.5 8 14 15 14.5 9 15 18 16.5 10 16 23 19.5 Results to show 25mls of hydrogen peroxide to 5mls of water Time 1st Result 2nd Result Average Result 1 2 6 4 2 3.5 8 5.75 3 4 10 7 4 5.5 12 8.75 5 6.5 15 10.75 6 7 16 11.5 7 8 17 12.5 8 9.5 18 13.75 9 10 18 14 10 11 20 15.5 Time 1st Result 2nd Result Average Result 1 2 5 3.5 2 3 7 5 3 5 10 7.5 4 8 14 11 5 8.5 16 12.25 6 9 18 13.5 7 9.5 18 13.75 8 10 18 14 9 10.5 18 14.25 10 11 18 14.5 Results to show 20mls of hydrogen peroxide to 10mls of water Results for 15mls hydrogen peroxide to 15mls of water Time 1st result 2nd Result Average Result 1 1.5 5 3.25 2 3 7 10 3 4 9 6.5 4 4.5 10 7.25 5 5 11 8 6 6 12 9 7 6.5 12 9.25 8 7.5 12 9.75 9 8 12 10 10 8 12 10 Results for 10mls of hydrogen peroxide to 20mls of water Time 1st Result 2nd Result Average Result 1 1 4 2.5 ...read more.


a mixture of solutions the reaction times would be slower as the liquids are moving at different speeds and the molecules collide in different ways, example glancing blows, which does little harm to the catalyst. Also at higher temperatures particles move faster so more collisions take place and they are more energetic so the reaction is faster. Chemical reactions also cause atoms to be rearranged by joining or separating to be able for atoms to join, a collision has to take place but this by itself wouldn't be enough. Bonds between atoms must be broken and new ones formed but this means that it takes a lot of energy for a successful collision to occur. This means there is a certain minimum energy needed before a reaction from a collision can occur this minimum energy is gained through higher concentration or a higher temperature. DETAILED PLAN FOR PRELIMINARY EXPERIMENT AND FINAL RESULTS We will use..... * Measuring cylinder * Delivery tube * Conical flask * Plastic container * Potato and Hydrogen peroxide This equipment will be set up as shown below We will use 4g of potato and add it to different amounts of concentration of hydrogen peroxide. * 30ml hydrogen peroxide 0ml water 25ml hydrogen peroxide 5ml water * 20ml hydrogen peroxide 10ml water 15ml hydrogen peroxide 15ml water * 10ml hydrogen peroxide 20ml water The ones marked with a bullet point are the amounts we used for preliminary testing. ...read more.


This shows that the two things are proportional to one another. EVALUATION What I predicted before the experiment was quite accurate. I predicted that as the concentration of hydrogen peroxide increased so would the rate of reaction. I feel the accuracy of my results were fairly good but for the 20mls of hydrogen peroxide to 10mls of water I think that between 3 minutes and 8 minutes the results don't fit the pattern. I can see this as the results show that more oxygen was produced while the expected results would have been less however towards the end the results level out and go against the expected pattern. To improve the experiment I would change a number of things. Although I felt at the time that it was accurate but I have since realized that these are things I could have improved. I would have made sure that I did the experiments more times because there would have been a better average. Also to get a more accurate set of results I would have made sure that no water had escaped from the measuring cylinder and made sure that I double checked everything making sure that only the one variable was certain to change. Final Time Average Rate of reaction 10 19.5 1.95 10 15.5 1.55 10 14.5 1.45 10 10 1 10 7 0.7 RATE OF REACTION = FINAL TIME AVERAGE OXYGEN PRODUCED ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Life Processes & Cells section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Life Processes & Cells essays

  1. Marked by a teacher

    Investigating the breakdown of hydrogen peroxide by the enzyme catalyse in potatoes.

    4 star(s)

    Diagram to show the process of the Lock and Key theory Lock and key is a common way to describe the enzyme-substrate interaction. It is a model for the interaction suggesting that the enzyme and the substrate possess specific shapes that fit exactly into one another, the binding site know as the Active site.

  2. Marked by a teacher

    The aim of this investigation is to find out what effect pH has on ...

    4 star(s)

    of the outlets of the bung * Attach the delivery tube in the other outlet * Set the stop-watch on count-up * Put the grated potatoes into the conical flask with a spoon and immediately close the flask with the bung and while doing this attach the other end of

  1. To investigate the effect of enzyme concentration on the activity of catalase in potato ...

    sometimes the bubbles collect up in the tube and come up out of the tube all at one time. This will cause inaccurate results because there will be a very fast reaction at the beginning. Which means patterns and trends could be affected.

  2. What influence does pH have on the enzyme Catalase?

    and therefore it would be more reliable to base a conclusion on. 3. Limit of the Range As I have already described in the limitations of the conclusion section, the range of pH values was not extensive enough to get a very good set of results.

  1. Decomposition of Hydrogen peroxide

    If substrate concentration is low the active sites of the enzyme molecules will not all be occupied, as there are simply not enough substrate molecules to occupy them all. As the substrate concentration is increased, more and more active sites are used.

  2. Biology catalyst couursework

    produced was on average 21.0 cm3, and at 0.8% concentration the amount of oxygen produced was on average 11.5 cm3. This is very close to half the amount of oxygen being produced so I can therefore perceive my prediction as being accurate.

  1. The aim of my experiment is to investigate how the mass of potato (concentration ...

    I removed water until the conical flask stopped floating. I measured the amount of water in the small trough using a measuring cylinder and noted the measurement. This is so I know how much water I need to place in the trough when I carry out my real experiment.

  2. The effect of hydrogen peroxide on catalase if you change the temperature.

    As I was measuring, my hand would move from time to time and therefore didn�t know where I should place my ruler afterwards. To over come this I should attach the ruler onto the test tube rack with cello tape, as it is transparent or maybe use a pointer.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work