• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Rates of Reaction.

Extracts from this document...

Introduction

GCSE Science Coursework Rates of Reaction Introduction Temperature, catalyst, surface area and concentration affect the rates of reaction. Catalyst can't be changed in variables so I will therefore use the concentration variables to support my conclusion because I am familiar with the theory of concentration on the affects of rates of reaction. I am going to measure the gas by using the syringe method we are going to make it fair by having exactly 1g calcium carbonate and 30ml of hydrochloric acid. Equipment * 1g Calcium carbonate * 30ml of hydrochloric acid at concentrations of 0.75m, 1m, 1.25m, 1.5m, and 1.75m. * Conical flask * Syringe * Delivery tube * Stopwatch * Scales * Measuring cylinder Method 1. Add 30ml of 0.75m concentrated Hydrochloric acid to a conical flask 2. Add 1g of marble chips to hydrochloric acid in the conical flask 3. Put on the cork attached to the delivery tube and the syringe on the conical flask. 4. Start the stopwatch 5. Measure the gas produced in the syringe at intervals of 30 seconds for 5 minutes. 6. Put results in a results table 7. Repeat twice to gain an average 8. Repeat method again with different hydrochloric acid concentrations such as 1m, 1.25m, 1.5m and 1.75m Fair testing Fair testing can help you're experiment be as accurate that it can be by giving you accurate results and no awkward results. ...read more.

Middle

Results Number of minutes 0.75m 1m 1.25m 1.5m 1.75m 0.5 3 4 5 8 9 1 5 6 10 17 19 1.5 7 10 17 26 30 2.0 10 14 25 37 42 2.5 14 19 33 49 53 3.0 18 23 40 58 65 3.5 21 29 49 68 76 4.0 25 34 58 80 86 4.5 29 40 66 84 94 5.0 34 44 75 100 101 Amount of gas produced (ml) 34 44 75 100 101 1. Concentration of acid Number of minutes 0.75m 1m 1.25m 1.5m 1.75m 0.5 3 2 5 5 10 1 5 5 10 14 23 1.5 10 9 17 24 38 2.0 15 14 25 34 51 2.5 22 19 33 44 67 3.0 30 25 41 54 82 3.5 37 31 49 64 94 4.0 45 36 55 75 *103 4.5 51 42 62 85 5.0 58 47 70 93 Amount of gas produced (ml) 58 47 70 93 103 2. Concentration of acid * Means that the amount of gas produced went of the scale on the gas syringe. Number of minutes 0.75m 1m 1.25m 1.5m 1.75m 0.5 3 3 5 6.5 9.5 1 5 5.5 10 15.5 21 1.5 8.5 9.5 17 25 34 2.0 12.5 14 25 35.5 46.5 2.5 18 19 33 46.5 60 ...read more.

Conclusion

9 2.0 15 14 2.5 22 19 3.0 30 25 3.5 37 31 4.0 45 36 4.5 51 42 5.0 58 47 Amount of gas produced (ml) 58 47 Here are the anomalies results as you can see the 0.75m has produced more gas in the same amount of time than the 1m this is wrong because an acid with a higher concentration than 0.75m should always produce more gas and have a quicker reaction time. The reason for the anomalies results is because we did these two molar tests on two different days so one day could have been more warmer than the other because the temperature does affect the rate of reaction. The method was a good way of doing this experiment but the problem I had is with the equipment. One reason is if I would had a bigger syringe I would have gained better averages for example my 1.75m hydrochloric acid went off the scale at about 4 minutes. The way I could improve this test is by having a thermometer in the hydrochloric acid to keep an average of the temperature it is reacting at so I can spot the anomalies results by saying it was to warm on the day or too cold on that particular day. Parin Chouhan 11J 07/05/2007 ...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 Aqueous Chemistry 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 Aqueous Chemistry essays

  1. The Rates of Reaction of Metals with Acid.

    The order of the experiment will be gradient of the line. This sum relates to the practical because, I will be altering the concentration of known substances and deducing ra. In the experiments, I will be looking at the following null hypotheses to prove if they are correct or incorrect.

  2. To investigate the rate of reaction between different concentrations of hydrochloric acid with metal ...

    -A 100 cm3 measuring cylinder-measure the substance to the nearest cm3 -Stop clock-measure the time to the nearest second -Digital balance-2 decimal places Method I will be recording the volume of the product of the experiment, which I am measuring, (Carbon dioxide)

  1. Experiment to see how the quantity of marble chips affects the rate of reaction ...

    Method for real experiment: Put on goggles. Tuck in stools and keep bags out of the way. Half fill a plastic container with water. Use electric weighing scales to measure out 2-10g of small marble chips (different amount for each experiment).

  2. An Investigation to Measure the Rates of Reaction between Calcium Carbonate (Marble Chips) And ...

    The second time the experiment took place, the mass of calcium carbonate was kept the same but changes were made on the volume of hydrochloric acid used down to twenty centimetres cubed. With these measurements it was found that it was easier to take down the times.

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