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

How concentration affects rate of reaction

Extracts from this document...


Chemistry IGCSE Coursework V�ctor Toledo Science 10A How concentration affects rate of reaction AIM: We wanted to see if changing the concentration of one of the reactants also changed the rate of reaction by changing the ratio of acid to the other reactant. To test this we used calcium carbonate and hydrochloric acid: PLAN: We were going to calculate how concentration affected reaction rate by reacting the calcium carbonate and acid in a conical flask and then collecting the carbon dioxide that would come out in a measuring cylinder filled up to the top. Then we would record how much gas was collected during a minute and repeat these steps with a different concentration of the acid. ...read more.


4. Get hold of the stopwatch and be prepared. Tell somebody to hold the tube where the entrance to the cylinder is because it might pop out because of the gas' force. Add the two reactants into the conical flask and quickly put the stopper. Start timing immediately. 5. Let 1 minute pass and record the volume of gas in the cylinder. 6. Repeat steps 2-5 but changing in step 3 the concentration of acid by diluting it with water: 20:5, 10:15, etc. VARIABLES Things that were different - Concentration of acid: This was the aim of the experiment, changing concentration to see if rate of reaction also changed. Things that were kept the same - Shape of flask: Depending on the shape of the container, particles would collide more/less often, so results would be inaccurate. ...read more.


Therefore, when concentration is high, reaction rate increases; when it is low, rate of reaction increases. EVALUATION: The reason why varying concentration affects reaction rate is because of the collision theory. This states that the reactant particles collide together and form the chemical reaction. If concentration is high, there are more particles in the same volume so collisions occur more often. There was an anomalous result in our experiment. In the trial for 1.2 moles of concentration there was a peak and instead of 84 it should have been in between 40 and 61. The problem might have been that the mixture was mixed too much, there was too much of calcium carbonate, the stopper was put much faster than others. We could have improved timing, more accurate measurements and making sure that no gas escapes before getting to the cylinder. ?? ?? ?? ?? ...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 Classics section.

Found what you're looking for?

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

Here's what a teacher thought of this essay

This report includes the basic elements for a sound laboratory report. It is significantly limited by the small amount of data collected and the basic and brief evaluation of that data. What was written was done well.

Marked by teacher Cornelia Bruce 17/04/2013

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 Classics essays

  1. Marked by a teacher

    Chemistry rate of reaction coursework

    3 star(s)

    seconds 1 minute 7 seconds Add 5cm3 sodium Thiosulphate and 15cm3 of water into a small beaker, place on a cross, then add 5cm3 1M HCl 3 minutes 4 seconds 3 minutes 8 seconds These results have given me an idea of how far the range will vary and that

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

    = 2% 0.2 (ml) / 5 (ml) therefore there is 2% error per 5ml reading 2% + 2% = 4% total percentage error for measuring cylinder Therefore, total % error for the graph is 10.3%.

  1. To Compare the Concentration of the Enzyme Catalase in Plant v. Animal v. Fungal ...

    This, therefore, indicate that fungi have a higher concentration of catalase than animals or plants. Whilst it was expected that plants would have a lower concentration of catalase than either animals or fungi, it would have been expected that animals being the more complicated organism would have a higher concentration of catalase than fungi.

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

    Since 2S2O32-(aq) + I2(aq) --> S4O62-(aq) + 2I-(aq) I2 is titrated with known volume and concentration of S2O32-. Then the no. of mole of I2 can be calculated by comparing the mole ratio. Since H2O2(aq) + 2I-(aq) + 2H+(aq) --> I2(aq)

  1. Compare the rate of hydrolysis of some halogeno-compounds.

    PartA is repeated at room temperature using 1-bromobutane, 2-bromobutane and 2-bromo-2-methylpropane. 2. The speeds at which precipitates appear were recorded. 3. The colors and the densities of precipitates were recorded. C. Comparison of the rates of hydrolysis of aliphatic and aromatic haloalkanes 1.

  2. Investigate how concentration of hydrochloric acid (HCL) affects its reaction with calcium carbonate (CaCO3).

    * Human error in the measurement of things in the experiment. * Water in the conical flask. * The pureness of the calcium carbonate chips. * Layers of coating on the calcium carbonate chips.

  1. How does varying the concentration Rennin affect the coagulation time of Milk

    I also predict that eventually all the milk will be coagulated by a certain number of enzymes in a certain time. If after this point the concentration is still increased, it will make no reaction and the experiment will be in excess of Rennin.

  2. Investigation into the factors affecting the rate of infiltration of soils with varying agricultural ...

    I investigated the effect of gradient on infiltration in a preliminary field trial and found that there was a noticeable increase in the rate of infiltration on the steeper sections of the farm and so to prevent this from affecting the results I will have to choose areas, which have little or no slope.

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