• 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

Rates of reaction coursework The rate of reaction is the speed in which the reaction occurs. For a reaction to take place, the particles that are reacting have to collide. If they collide, with enough energy and pressure to turn, then they will react and form a compound. There are 4 factors what effect the rate of reaction. Firstly temperature will effect the rate of reaction as there will be more energy in the particles making the particles faster resulting in more chance of collision. Secondly concentration and pressure will effect it as if there is more pressure there will be more particles within a given space therefore particles will collide more often resulting in the rate of reaction increasing. Thirdly the size of the particle will effect the rate of reaction as if the particle is smaller the greater the area that the reaction can take place in. ...read more.

Middle

1.5 molar =237g of sodium thiosulphate in 1000mls of water. 1 molar =158g of sodium thiosulphate in 1000mls of water. 0.5 molar =79g of sodium thiosulphate in 1000mls of water. 0.25 molar =39.5g of sodium thiosulphate in 1000mls of water. Method I will wash out all apparatus to avoid cross contamination. 1. Into a conical flask I will add 25cm� of 2 molar sodium thiosulphate. 2. The flask will be placed on top of a piece of paper with a pre drawn cross on it. 3. 25cm� of hydrochloric acid is added to the flask and the stop watch started as soon as the acid has been added. 4. When the precipitate of sodium has formed and at the point when I can't see the cross I will stop the stop watch and record the time in a pre prepared table. ...read more.

Conclusion

I think my results have shown a big enough range as I have done 4 results these were enough to draw a conclusion as it shows a negative correlation on the graph. I didn't have no problems with my method as I repeated the results 3 times and got the average however I should have used a thermometer as the temperatures could have been different effecting my results. However I did measure the thiosulphate and the acid as if I didn't there would be more particles meaning more chance of collision. And my results were very precise as I used a stopwatch which meant the time was accurate unlike if I counted the time myself. The readings for the reaction was fairly accurate however it could be improved by using a light sensor what meant we would know the exact time in which we couldn't see the cross. ...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


This is a routine task of limited complexity. The appropriate level of scientific vocabulary is used. However with no results data or graphs included the quality of the report is limited. Specific strengths and improvements have been suggested throughout.

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 Patterns of Behaviour essays

  1. THE EFFECT OF BILE SALT ON THE ACTION OF THE ENZYME LIPASE

    seen in figure 2.2 Figure 2.2 Lipase on lipids A lipid is defined as an organic molecule that has a much greater solubility in common solvents (e.g. chloroform, ether) than in water. The enzyme lipase assists in the breakdown of lipids into smaller molecules known as carboxylic acid or fatty acids.

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

    This means that the extra heat for the higher concentrations could have effected the results and increased rate of reaction - hence the two lower concentrations have figures slightly lower than the line of best fit. Apart from these two anomalies, there is one further anomalous point that lies only a bit away from the line of best fit.

  1. Effect Of Substrate Concentration On The Activity Of Catalase

    The PH of the reactants should be kept constant. This will not be hard to ensure as the PH of the reactants does not vary significantly during the course of the reaction. 2. The temperature of the reactants will have to be kept constant during the reaction. This is a variable which will be harder to control.

  2. Disappearing cross (aka Rate of reaction).

    be in the water bath to remain the optimum temperature while doing the experiment. Once the two liquids mix they will be timed until the solution is so cloudy that the cross is no longer visible. The time will be written down and repeated twice more.

  1. The Effect of Catalase in the Breakdown of Hydrogen Peroxide

    Average Reading (cm3) Average Volume of Oxygen (cm3) 20 45.9 2.8 30 45.4 2.1 40 42.8 5.7 50 42.7 5.2 60 31.5 10.9 70 32.5 11.49 Percentage of Catalase: 20% 1st Attempt 2nd Attempt Time: Reading (cm3): Volume of Oxygen: Reading (cm3): Volume of Oxygen: AVERAGE Reading: AVERAGE Volume of Oxygen: 0 48.7 0 48.5 0 48.6 0

  2. An investigation into the effect of concentration on the rate of reaction. The disappearing ...

    very accurate in accordance to the general pattern of the results set by the line of best fit. There is a 0% error on all of my results except for the three that are slightly anomalous. However, from my percentage error results I can see that they are quite accurate with the largest percentage error being 9.1%.

  1. Reaction between thiosulphate and hydrochloric acid

    This means the particles around it in the solution will have more are to work on so there will be more useful collisions. The more finely divided the solid, the faster the reaction, because the surface area in contact with the gas or liquid is much greater.

  2. Investigating Rates of Reaction.

    Record this length of time. Repeat these steps with the different concentrations of hydrochloric acid. I have chosen to use these volumes, as in my preliminary work I used 50cm3 of sodium thiosulphate and 5cm3 of hydrochloric acid (1M). These volumes made the reaction occur within a reasonable time range,

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