• 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

# I am going to investigate one factor, which affects the rate of decomposition of hydrogen peroxide H2O2 (aq).

Extracts from this document...

Introduction

GCSE Science - Sc1 Coursework - Experimental and Investigative Science Plan I am going to investigate one factor, which affects the rate of decomposition of hydrogen peroxide H2O2 (aq). We know that when a certain solid is added to a solution of hydrogen peroxide in water, it makes the hydrogen peroxide break down into water and oxygen gas much faster then it would on its own. We also know that the following decomposition takes place: Hydrogen peroxide water + oxygen 2H2O (aq) 2H2O (l) + O2 (g) so this can help me in making a prediction. To make the test a fair one I would only be able to change one thing at a time so therefore the factors, which I could investigate, are: 1) The amount (mass) of catalyst e.g. 0.1g, 0.2g, 0.3g etc 2) Temperature 3) Different catalysts e.g. copper oxide, zinc, iron oxide. 4) State of division of the catalyst (powder, small, medium, large lumps). 5) Rate of swirling e.g. slow, medium, fast. 6) Change the volume of the H2O2 (aq). ...read more.

Middle

I then placed the syringe in the clamp and put the delivery tube going into a bung in the syringe (see diagram below): I then very quickly put the manganese oxide into the boiling tube filled with 20cm� of hydrogen peroxide and put the bung into the boiling tube (see above diagram). I then timed every 10 seconds with a stopwatch and at every 10th second I measured the amount of oxygen that had gone into the syringe. I noted the results down on paper using a pen. I was going to repeat the experiment in order to get averages and make my results more reliable, but I ran out of time. To make the experiment fair I only changed one factor. I also made sure I only started timing once the test tube was attached to the syringe. There were no gaps for oxygen to seep in, making the test a fair one. Results Amount of oxygen in syringe with ...g of catalyst (cm�) Time (secs) 0.1 0.2 0.3 0.4 0.5 0.6 10 12 14 15 34 50 60 20 22 22 44 63 87 97 30 31 31 65 ...read more.

Conclusion

Several times I did not push the syringe back into the original place, so I had to re-weigh and perform the experiment for that particular mass of catalyst. This took up some time. I may have been slightly inaccurate in measuring the amount of oxygen collected in the syringe. This is because you have to look at the stopwatch as well as the measurements on the syringe, which can be hard. Therefore I could have made my results inaccurate by only a couple of cm�. To improve the experiment I could repeat the experiment three times and work out an average for each amount of catalyst. This would make my results more reliable. I could also do the experiment with other people so that one can time, one person could read and another could write down the results. This would make my results more reliable. It would also be a good idea to use a syringe that can hold more than 100cm� because I could see how long it took to actually stop decomposing, improving my results. To further my work I could repeat the same experiment using different catalysts such as copper oxide or iron oxide and see if they worked better at decomposing the hydrogen peroxide quicker. 1 ...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

# Related GCSE Patterns of Behaviour essays

1. ## The Decomposition of H2O2 using Catalase, in yeast as a catalyst.

So after this trial I needed to take readings after shorter intervals to give me a better idea of the rate of reaction. I then tried to take readings every 10 seconds, but this made it difficult to get accurate results, because it gave me so little time to write

2. ## The Effect of Catalysts on the Decomposition of Hydrogen Peroxide (H2O2)

Although the rate of reaction has been increased the total volume of O2 produced, (were the H2O2 left to fully decompose without the catalyst) is not increased only gained in a shorted period of time. So a catalyst therefore does not create something that would not form anyway it just makes the reaction happen faster.

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

Range of Results I have decided that the suitable range of results for the main investigation will be to take an increment of 2 Vol. from 4 Vol. to 20 Vol., leaving us with 9 points to be plotted on the graph.

2. ## To determine the rate law for a chemical reaction among hydrogen peroxide, iodide and ...

This prevented any readily apparent reaction of equation (III). However, after all the thiosulfate ions had been consumed by the reaction of equation (II), triiodide ions reacted with starch to form the blue starch-pentaiodide complex. By varying the concentration of each of the three reactants (H2O2, I- and H+), we will be able to determine the order of the

1. ## Investigate how the concentration of the substrate hydrogen peroxide (H2O2) affects the rate of ...

The effect of the competitive inhibition can be reversed by increasing the amount of inhibitor. Figure 3 shows the effect of a competitive inhibitor on an enzyme-controlled reaction over a range of different amounts of substrate (to speed up the reaction).

2. ## Investigate the effect of changing conditions on the rate of reaction between Catalase (Celery) ...

Therefore I will keep the other variables the same to make my results accurate. To make my experiment a fair test, I will: * Use the same equipment for each test, * Use the same vessel for the reaction for each test, * Keep the quantity of catalase and hydrogen

1. ## To investigate different masses of catalysts with Hydrogen Peroxide to see if the rate ...

There is a minimum amount of energy which colliding particles need in order to react with each other. If the colliding particles have less that this minimum energy, then they just bounce off each other and no reaction occurs.

2. ## Magnesium Oxide

Method What I'm going to measure is the mass of the magnesium ribbons at different lengths, and I'm also going to measure the amount of magnesium oxide it makes. The mass would be measured by a digital balance (0.01g), which was very accurate way of measuring the mass because it can detect up to two decimal places.

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