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Investigating the effect of concentration on the rate of a reaction

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Chemistry coursework by Nanjie Lu Investigating the effect of concentration on the rate of a reaction Planning Introduction There are four factors that can affect the speed of reaction they are: * Temperature * Surface area * Catalyst * Concentration The reasons for this is showing below: What will affect speed of reaction Why will it affect the speed Temperature High temperature, the particles will move more quickly. They will collide with each other more often and greater energy. Surface area Large surface area has more particles. They are exposed and available for collisions. Concentration High concentration, the particles are crowded close together and will collide with each other more often. * A catalyst is a substance, which increase the rate of a chemical reaction, without being changed during the process. It can help to make the speed of reaction more quickly. Predictions From the experiment and information I already knew the concentration could affect the speed of reaction. The result is showing below: Concentration (M) Loss in mass in 100 seconds (g) 0.2 0.350 0.4 0.700 0.3 0.520 0.6 0.104 0.5 0.085 1.0 0.170 Scientific reasons for prediction Increase the concentration will happen because it makes the particles closer together, so there are more collisions per second. The reason for this is when we increase the concentration there are more particles in the space and make this space more crowded. ...read more.


There is another table to shows the result I've got from an experiment: From the table above shows the result, I decided I am going to use the concentration between the 0.10M to 1.00M, and I will chose five different concentrations they are: * 0.30M * 0.50M * 0.60M * 0.80M * 1.00M The reason for this is I think when the concentration was 0.30 the result was very low; the speed is too slow to measure. I do not think I will get more accurate result, so I use 0.30M as the lowest concentration. Others we knew the highest concentration is 1.00M so I include this concentration, 0.50M is the middle number so I want to know what is the result when the concentration is half. 0.60M and 0.80M is two gaps between the 0.50M and 0.80M. So I want to know what are the results of these two concentrations. Safety When I doing the experiment I will follow the science lab rules properly all the time. I will wear the safety gasses, make sure any hydrochloric acid solution will not spill out and will not get anywhere on my body because it can corrupt your skin and other equipments in the science lab. I will not smell the gas when it is come out. If these things will happen I will ask my science teacher for help. ...read more.


Also I can use the computer program to check my result and use my result to compare the result they have got. If I did anything wrong with my experiment I will do it again. I will know if result is wrong because it will not follow the same pattern as the rest. Step by step detail The list below shows all the instruments I will use in my experiment. * One top pan balance * One gas collection tube * One stopclock * One stopper * One bowl * Two pieces of clamp * One conical flask * 0.5 gram of medium size marble * 50 ml of hydrochloric acid solution The method: 1. Prepare all the instruments ready. Example: collect combine all tubes together one side link to the gas collection tube another side link to the conical flask. Fill in the water into bowl and gas collection tube. Test the stopclock. 2. Weight out 0.5g medium size marble chips on a balance. 3. Measure out 50ml of hydrochloric acid using a measuring cylinder. 4. Place marble chips into the conical flask. 5. Put the acid solution into the flask and put the stopper into the flask. 6. When first bubble appears, start the stopclock. 7. Every 30 seconds take the volume of gas reading from the gas collection tube. 8. I will stop measuring when the gases fill whole space of gas collection tube. 1 ...read more.

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