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

The aim of this coursework is to investigate how the temperature can affect the rate of reaction. I will use sodium thiosulphate and hydrochloric acid as the reactants of the experiment, and then vary the temperature to see the speed at which they react.

Extracts from this document...

Introduction

Chemistry Coursework Rate of Reaction Candidate name: YangMei (Juliana) Plant 11K Candidate number: 8087 Rates of reaction Aim: The aim of this coursework is to investigate how the temperature can affect the rate of reaction. I will use sodium thiosulphate and hydrochloric acid as the reactants of the experiment, and then vary the temperature to see the speed at which they react. Scientific Background: The rate of reaction is the speed at which a chemical reaction takes place. The rate at which the reaction takes place cannot be worked out from its chemical reactions, but by measuring how much reactant is used up in a certain time, or how much product is formed at a certain time. Whatever the matter, the amount of product formed at the end of the experiment should always equal to the amount of reactants at the start of the experiment, because all chemical equations are balanced even when the product is invisible. The product of a chemical reaction is never disappeared but transferred to another state, such as from a liquid to a gas. The rate at which a chemical reaction takes place can vary greatly, such as from extreme explosions to slow rusting. ...read more.

Middle

* Use the same volume of concentration throughout the whole experiment. Prediction: Since the rate of reaction is the speed at which a chemical reaction takes place, I predict that if I increase the temperature of the reaction, the speed at which the reaction is going to occur will also increase. This is cause by the molecules becoming thermally active, which increases the collisions between particles and so the bonds breaks more quickly. This increase of speed at which the bonds break also increases the reaction, so the speed at which the reaction takes place in a given time accelerates. On the other hand, if the temperature decreases then the rate at which the reaction takes place will also decrease because there are no movement/ collisions amongst the molecules to create enough energy to break the energy barriers to start a reaction, in other words there is not enough kinetic energy to break the existing bonds between the molecules. In this case the reaction will only take place when hydrochloric acid is added to the sodium thoisulphate, as sodium is alkaline when it mixes with the hydrochloric acid an exothermic reaction takes place. ...read more.

Conclusion

disappear sec 20 1.08 25 35 30 25 35 17 40 15 45 13 50 12 Evaluation: I have added water to the solution to make it more dilute, the readings did indeed became more spread out. Since I have diluted the solution to a half, the time taken for the cross to disappear should now double, but according to the table only a few did e.g. at 20 c. This shows that some errors have occurred in the experiment, which is why the readings don't match. It could be that the stopwatch was started late or some careless mistakes made by me. I have to take this into account when I do my final experiment. The accuracy of the results could be improved further if I have recorded the readings to 2 decimal places instead of none at all. By recording it to 2 decimal places the results are more likely to be more accurate as it involves more detailed. Final Experiment Volume of concentration: 40 ml water 10 ml sodium thoisulphate Temperature c Time for cross to disappear sec 0 8.13 5 7.22 10 5.31 15 4.21 20 3.04 25 2.31 30 1.40 35 1.05 40 0.55 45 0.37 50 0.25 ...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. Marked by a teacher

    In this project I am going to investigate rates of reaction of an indigestion ...

    3 star(s)

    These active ingredients are: Magnesium Carbonate Calcium Carbonate Sodium Hydrogen Carbonate General Equation: Metal Carbonate + Acid --> Metal Salt + Carbon Dioxide + Water Magnesium Carbonate + Hydrochloric Acid --> Magnesium Chloride + Carbon Dioxide + Water MgCO3 + 2HCl --> MgCl2 + CO2 + H2O Calcium Carbonate +

  2. How does temperature affect the rate of reaction between sodium thiosulphate and hydrochloric acid?

    to obscure the black cross, meaning the reaction time also increase as the temperature increase. On my second reading at 30(0C) I didn't get a time. This is because I pressed the wrong button on the stop clock, causing it to reset, not giving me a reading.

  1. The aim of this coursework is to investigate the rate of reaction between sodium ...

    little effect on the rate of reaction, and that there is little change from the rate of reaction of the first conical flask. However, in the third conical flask, when we halved the concentration of sodium thiosulphate, we can see that the rate of reaction halves aswell.

  2. How does the activation enthalpy and the rate of the iodine-clock reaction vary with ...

    the following reaction mixture is made up in one of the 50ml beakers at the correct temperature: 1.0 cm3 of Starch Suspension (1%) 2.0 cm3 of Na2S2O3 Solution (0.01M) 3.0 cm3 of KI Solution (0.2M) The volumes were measured using the syringes in the beakers, as accurately as the syringe will allow.

  1. Free essay

    Close Your Eyes

    I made sure I was alright before heading to the kitchen for some water. I entered the kitchen and was hit by the familiar scent of coffee. I gagged, god, being hung over is so not fun. I walked over to the tap and poured myself some water but before

  2. Experiment to Investigate the Rate of Reaction between Hydrochloric Acid and Sodium Thiosulphate, with ...

    reaction, when in the conical flask, because if you use the same hydrochloric acid and sodium thiosulphate from the last reaction then it will slow down the rate of the reaction in the current reaction.

  1. How does the Temperature affect the Rate of Reaction between Sodium Thiosulphate and Acid?

    When we increase the concentration, we are increasing the frequency of collisions between the particles. However changing the concentration does not change the speed at which the particles are moving. A good way of describing this is For example if you are in a 60,000 capacity football ground and there

  2. Investigate the rate of a catalysed reaction, when altering the temperature of the solution ...

    Outside this range of 0-40c, in an enzyme catalysed reaction, the rate of reaction falls and at approximately 60c, it stops completely. As I said before, once the rate of reaction reaches the optimum, the reaction will slow down due to the denaturing of the enzyme molecules.

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