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

Science Rate Of Reaction

Extracts from this document...


Aim: to investigate the effects of concentration, on the rate of reaction, between hydrochloric acid and sodium thiosulphate Scientific Knowledge: Sodium Hydrochloric Sodium sulphur water sulphur Thiosulphate acid chloride dioxide Na2s2o3 2hcl 2nocl s so2 h2o The collision theory believes that as the kinetic energy of particles increase so does the rate of reaction. Activation energy is the level of energy needed for a successful reaction to take place. For example the chemical reaction between methane and oxygen doesn't occur at room temperature but when heated they react. The reason for this is that some substances have extremely strong bonds which need more energy to break whilst others have weaker bonds which take less energy to collapse. ...read more.


4. Repeat steps 1, 2 and 3 using different concentrations of sodium thiosulphate solution. 5. Do all these steps three times to validate results. Prediction: I believe that as the concentration increases so will the rate of reaction. This is because from my research which is in my scientific knowledge I have seen that speed of a reaction increases with three thing and one of them is concentration. Safety: For safety reasons I will use the following: 1. Safety mat 2. Goggles 3. Apron 4. Gloves Fair test: In order to keep my experiment viable I will keep the following the same: Temperature: this is because from my scientific knowledge I have learnt that temperature can change the speed of a reaction Surface area: this is because from my scientific knowledge I ...read more.


This goes in line with my prediction. However there are some anomalous results which could have been caused by human error. One example is the error of the human eye and human reflexes. Evaluation: If I had the opportunity of expanding this experiment I would expand it to cover other concentrations of sodium thiosulphate I would also try and see what difference the concentration of hydrochloric acid would make to the rate of reaction. Also would experiment what the other variables would do to the experiment. In order to avoid the anomalous results I would connect a commuter to a light sensor and cover the light bulb with a box so no light is let out. ...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

Here's what a teacher thought of this essay

3 star(s)

This is a fairly well written laboratory report. It covers some of the major factors associated with this type of investigation. Its main limitation is its brief conclusion and evaluation. There are more specific strengths and improvements suggested throughout.

Marked by teacher Cornelia Bruce 18/04/2013

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 Patterns of Behaviour essays

  1. Marked by a teacher

    Hypothesis: some metal carbonates decompose more easily than others when they are heated.

    3 star(s)

    This relates to the reactivity series. There is a big difference between the 3 carbonates and when repeating the experiments it is obvious. This makes the evidence strong. The collected evidence could be improved by giving a wider range of metal carbonates to test.

  2. A-Level Investigation - Rates of Reaction – The Iodine Clock

    both flasks into a single conical flask - start the stopwatch simultaneously. (7). Swirl the contents of the flask at a uniform rate above the white tile until the reaction reaches end-point.

  1. The Iodide - Persulphate Reaction: Determining the Effect of Concentration on Reaction Rate

    the reactant ions are being lowered to keep the ionic strength constant. For example in runs #1 and 6, the concentration of the persulphate ion has decreased by a half in run #6 and the iodide ion is constant; this should give the rate constant in run #6 a decrease by a half.

  2. The Disappearing Cross

    Also the same Bunsen burner and gas tap will be used to maintain continuity. All of these precautions will make my final results more reliable and keep anomalies at a minimum so thus make the entire investigation more successful. The only change that will happen will be that the temperature

  1. Iodine Clock Reaction

    o In spot plate B, 10 drops of Solution B were placed in each well until 10 wells contained the Solution. o With the stop watch at hand, and using the pipette labeled H2O, the contents of spot plate A, Well 1 were transferred to Well 1 of spot plate B.

  2. Investigation into the effects of trypsin on dried milk solution

    This indentation is called the active site. The substrate molecules (here this is the dried milk solution) will fit exactly into the indentation like a key in a lock hence the name "lock and key" and this means that the enzyme can only act on the appropriate substrate which in the case of this experiment.

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

    of mole of S2O32- increase, the no. of mole of iodine is also increase, then the concentration of iodine increase. The concentration of iodine increase is due to the iodide can be oxidized by oxygen which is promoted by acids. 2H2O2(aq) --> 2H2O(I) + O2(g) Hydrogen peroxide is unstable, then it decomposes to water and oxygen by time.

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

    The tissue was then weighed on a top-pan balance, after which 5g of the tissue was place into a test tube. Then 5cm3 of pH7 buffer was added to the test tube using a pipette. The apparatus was set up as above.

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