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# Rates of reaction

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Introduction

Rates of Reaction Introduction- Rates of reactions are how fast a reaction occurs. The factors that have an impact on the rate of the reaction are temperature, surface area, catalyst and concentrations. Temperature has an impact as when two chemicals react, their molecules have to collide with each other, and by heating the mixture you will be supplying high amounts of energy which will speed up the reaction. This is kinetic theory. Surface area has an impact on rate of the reaction as If one of the reactants is a solid, the surface area of that solid will affect how fast the reaction is, and this is because the two types of molecule can only bump into each other at the liquid solid interface. So the larger the surface area of the solid, the faster the reaction will be. Concentration has an impact as increasing the concentration of the reactants will increase the rate of collisions between the two reactants. ...read more.

Middle

2. Put 20ml of 2m HCl in a test tube. 3. Take the large sized marble chips and drop them into the test tube. 4. Start your stopwatch and stop it when the reaction stops when the large sized marble chip dissolves. 5. Record your observations. Test 2.- 1. Take 2g of medium sized marble chips. 2. Put 20ml of 2m HCl in a test tube. 3. Take the medium sized marble chips and drop them into the test tube. 4. Start your stopwatch and stop it when the reaction stops when the medium sized marble chip dissolves. 5. Record your observations. Test 3.- 1. Take 2g of small sized marble chips. 2. Put 20ml of 2m HCl in a test tube. 3. Take the small sized marble chips and drop them into the test tube. 4. Start your stopwatch and stop it when the reaction stops when the small sized marble chip dissolves. ...read more.

Conclusion

This was a major human error which changed our expected result. * We also were not precise in our measuring as we were meant to pour 20 ml of hydrochloric acid and we due to human error poured 2ml more or less, this must have impacted our experiment. * Another mishap was that we started our stopwatch before the calcium carbonate was dropped in the test tube as it was rather impossible to start the stopwatch at the exact time also we stopped the stopwatch 3-4 seconds after the reaction stopped. Improvements- We could have got a rather more accurate result if we would have been more careful. Extension- To extend this work we can- * We can experiment about the rates of reactions in factors like- concentrations, catalyst and temperature. * We can experiment with other more advanced factors that might slow the reaction rate. Written by- Kavya Sharma 8C (CLi) ...read more.

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