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Rate of reaction

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Introduction

ROXANNE DABIRI INTRODUCTION I will be conducting an experiment on the rate of reaction for my GCSE coursework. . We will be reacting sodium thiosulphate with hydrochloric acid. I will be investigating the effects had on rate of reaction. When sodium thiosulphate and hydrochloric are mixed, a yellow precept of sulphur is produced. The solution becomes increasingly difficult to see through as more and more sulphur is formed. WHAT IS RATE OF REACTION? The rate of reaction tells us how quickly a chemical reaction happens. Rate is measuring of the change that happens in a single unit of time. Cause its not enough to know if a reaction is fast or slow. We can't work out the rate of reaction from its chemical equation. Equations can only tell us how much product we can get. They don't say how quickly it is made. We can only find the rate by actually doing experiments. During a reaction, we can measure how much reactant is used up in a certain time. On the other hand, we might choose to measure how much product is formed in a certain time. The factors that affect the rate of a chemical reaction are: * Temperature * Surface area * Catalyst * Concentration * Pressure (only occurs in gases) AIM A reaction can be made to go faster or slower by changing the temperature of the reactants A reaction goes faster when the temperature is raised. ...read more.

Middle

You could fall and hurt yourself or others. You could run Into or knock someone carrying hot materials or chemicals and as a result they could end up spilling them on you or themselves. Wipe up spills - If you spill something it must be cleaned up quickly and appropriately. Someone could slip on chemicals that had been spilled on the floor and hurt themselves. Wear goggles - You must wear goggles at all times when heating chemicals in case they spit or splash out of the test tubes. They may get into your eyes and blind you. Acids are corrosive - This is basically the same as wiping up spills but this also involves carrying and handling the chemicals. Be careful not to get it onto your skin. Report breakages - You must tell the teacher if you break any apparatus including glassware. Someone may not notice it and cut themselves on it. Use tongs when carrying hot glassware - Tongs must be used or else you burn yourself and/or drop some apparatus containing chemicals. EQUIPMENT 1 thermometer 1 beaker 2 measuring cylinders 1 conical flask 1 tripod 1 gauze 1 heatproof mat 1 stopwatch 1 Bunsen burner Pad (marked with black cross) white cross 1 pair of tongs 1 pair of goggles 1 apron 2 Pipette Sodium Thiosuphlate Hydrochloric acid Method 1) Measure 5ml of 0.5M Hydrochloric Acid using the 10ml-measuring cylinder. 2) Measure 10ml of Sodium Thiosulphate using the 50ml-measuring cylinder. ...read more.

Conclusion

13 14 5.18 ANALYSIS From this experiment I have found that as the temperature and concentration is increased the time taken for the reaction to take place decreases. This means the rate of reaction increasers as it takes less time for a reaction to take place, so more take place per second. In the temperature experiment the time taken for a reaction to take place decreased. EVALUATION I believe that I do have an accurate set of results and that I do have enough results to be sure about my conclusion. My results are accurate because when I read the collision theory it told me exactly what my results told me. I do not have any anomalous results, which do not fit in the pattern because my predictions coordinated with my results very well. My method of carrying out my experiment was fairly accurate. I made sure that I washed the beakers clean for the other two concentrations and the second experiment, I measured the same amount of solution in each time and I stopped the stopwatch as soon as I thought the cross had disappeared but because it was based on our judgement it could be wrong, cause no scientific experiment is based on judgement. An improvement that we could have made would be that we would be able to carried out the experiment in a completely controlled environment, results would have been totally accurate. All in all I think this was a good experiment and the best that could have been done with the time and resources available. The results supported my predictions and they seem to be fairly reliable results. 1 ...read more.

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