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

How varying the concentration of Hydrogen Peroxide changes the rate at which an alginate bead reacts in Calcium Chloride.

Extracts from this document...

Introduction

Biology Coursework Title: How varying the concentration of Hydrogen Peroxide changes the rate at which an alginate bead reacts in Calcium Chloride. Equations: In this experiment I am investigating the reaction: 2H2O2 2H2O + O2 Hydrogen Peroxide Water + Oxygen Aim: I am going to try and find out how varying the concentration of Hydrogen peroxide changes the time it takes for the yeast alginate ball to rise from the bottom of the test tube with different concentrations of Calcium Carbonate and Water. Normally the decomposition of hydrogen peroxide takes a long time, but the catalyse will speed up the reaction. Introduction: Catalyse breaks down the Hydrogen Peroxide into water and Oxygen. We are measuring the production of Oxygen because it is a visible reaction, whist Hydrogen and Water are both clear fluids, so it would be impossible to see the actual reaction occurring. During the production of Oxygen, Oxygen sticks to the beads and cause them to rise to the surface. Enzymes are useful because they are catalyses and speed up the reaction. The basic mechanism by which enzymes catalyse chemical reactions begins with the binding of the substrate (or substrates) ...read more.

Middle

* The shape of the measuring cylinder must be kept the same otherwise the alginate balls would travel different distances. * The size of the yeast beads must be kept the same. * The height I drop the beads at must remain the same otherwise the distance that the bead has to travel will be faster for different beads. Independent Variable: During the experiment, I changed the concentration of both hydrogen peroxide and water. Concentration of Hydrogen Peroxide (%) Concentration of Water (%) 100 0 90 10 80 20 70 30 60 40 50 50 40 60 30 70 20 80 10 90 Dependant Variable: I measured the time it took for the bead, after being dropped into the hydrogen peroxide and water solution, to sink to the bottom of the test tube and rise again to the top. The bead rises due to the production of Oxygen (O2) bubbles surrounding the bead. Apparatus: Diagrams: Making the beads Timing the rising of the beads List: * Alginate * Water * Yeast * Measuring Cylinder * Hydrogen peroxide * Syringe * Calcium chloride solution * Sieve * Plastic spoon and cup with punctured holes added * Glass rod * Stop clock * Tweezers Method: The Making of the Yeast Alginate Balls: * First of all I placed 3ml of alginate preparation into a small beaker. ...read more.

Conclusion

40) then follow it along to the Y axis and read the result and then do the same twice as far up the X axis (e.g. 80) the number you get on the Y axis should be double the previous number. I have highlighted this on the graph to show that the results are correct to my prediction. The results turned out this way because of the particle collision theory that states that if there are twice as many particles there is twice the probability that the particles will collide. Therefore if there are half as many there is half the probability that the particles will collide. I could make this experiment better by making more accurate measurements. For example if I measured every alginate ball and weighed them to make sure all the balls are the same the results are likely to be more accurate. Also if I repeated the results many more times I would get a more accurate set of results. Another important factor to consider is that Human accuracy in measuring the time is not terribly accurate. You could make your results more accurate by using light gates to sense the alginate balls passing certain points (Top and bottom). By looking at my graph I think you can see that my results are good enough to support my conclusion. ...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 Patterns of Behaviour 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 Patterns of Behaviour essays

  1. Factors Affecting the Rate of Catalytic Decomposition of Hydrogen Peroxide.

    If it did, the flask would be rewashed, if it did not, it would be rinsed with water and then used * Improperly mixed hydrogen peroxide, wrong concentration used: this would mean that the concentration would be a larger/smaller value than expected, and this (as the experiment proved)

  2. Effect Of Substrate Concentration On The Activity Of Catalase

    Reaction Rate for the concentration of 1.5% 10s = 20 = 2.2 cm3/s 9 20s = 20 = 2.0 cm3/s 10 from studentcentral.co.uk 30s = 19.5 = 1.4 cm3/s 13.5 40s = 15.5 = 1.1 cm3/s 14 50s = 14 = 0.8 cm3/s 17 60s = 9 = 0.5 cm3/s

  1. The Effect of Catalase in the Breakdown of Hydrogen Peroxide

    This is important as the results can be very different than expected and, thus; can make the experimental predictions seem incorrect. It is therefore; essential to use to different equipment for various tasks to ensure that an un-timed reaction takes place, as well as fair testing and accurate results.

  2. Investigating how varying the concentration of substrate (hydrogen peroxide) affects the rate of reaction ...

    * What I found out from my preliminary experiment During the preliminary experiment I found out that the reaction happened too quickly to take readings in shorted time intervals, so I tried using 10 grams of celery and 5ml of hydrogen peroxide, I found this worked better.

  1. To investigate the effect of varying the masses of white sugar and yeast and ...

    you open the bottle you see 'streams' of gas running from the sides. In bread dough the nitrogen gas bubbles trapped in the dough during mixing provide the nucleating sites; The oxygen from the air has been used up by the yeast in respiration.

  2. An investigation to see the difference in the rate of reaction when catalyse is ...

    Concentration of H2O2. - If the concentration of H2O2 was very high then the catalase will be able to break it down faster. This is because if there is a high concentration of H2O2 then there are more H2O2 molecules for the catalase to break down so the catalase can

  1. Investigate the action of the Enzyme Catalyse

    The syringe with the hydrogen peroxide in it was attached to the bung on the conical flask. Everything was ready so the Hydrogen Peroxide was released into the conical flask. The stop clock was started immediately and the gas (oxygen)

  2. Investigating making Epsom salts by varying the rates of reaction.

    As you can see where the temperature is colder the particles are less energetic and not that close together which means that it takes a longer time for them to collide and with a decrease amount of force applied as they have less energy inside them to give out.

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