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Investigation Of The Effect Of The Mass Of Zinc, On The Temperature Change Of A Copper Sulphate Solution

1142 words - 5 pages

Note: I couldn't paste in pictures and diagrams so please excuse any large spaces.Planing my investigationMethod1.Firstly I will measure 20ml of Copper Sulphate solution (CuSO4) in a measuring cylinder, for precise accuracy, and then pour the solution into test tube. I will place the test tube into a beaker and insulate the test tube, for minimum heat loss. (As shown in the diagram above.)2.Secondly I will measure the required amount of Zinc (Zn) on a weighing scale, again for precise accuracy. I will then measure the starting temperature using a thermometer. Next I will pour the Zinc into the test tube containing CuSO4.3.Finally I will measure the final temperature using a thermometer and record the temperature rise in °c. (I will carry out all my experiments under lab safety precautions.)Variables*I will vary the mass of Zinc, & use the following Zinc weights: 0.5g, 1g, 1.5g, 2g and 2.5g.*I will repeat each experiment twice for an average.For a fair test I will need to control many variables. I will stir the reaction an accurate number of times. I will record the temperature with a thermometer waiting until the temperature begins to drop so the temperature has fully risen. I will measure the volume of the CuSO4 solution accurately with a measuring cylinder, and make sure the concentration of CuSO4 is constant throughout all the investigation. I will weigh the Zinc with a weighing scale and make sure it's free of any impurities.Prediction and Science behind PlanI predict increasing the mass of Zinc will increase the temperature rise of the Copper Sulphate solution.When Zinc reacts with copper sulphate, the Zinc atoms displace the Copper atoms from Sulphate to form Zinc sulphate and Copper. This is simply because Zinc is more reactive than copper. This is called a displacement reaction.Zinc + Copper Sulphate Copper + Zinc Sulphate + EnergyZn + CuSO4 Cu + ZnSO4 + ÄHFor this chemical reaction to occur, the Zinc and Copper Sulphate particles must collide. For an effective collision there must be enough energy involved in the collision to break the chemical bond between Copper Sulphate, this requires energy absorbed from the surroundings, so this process is endothermic (The reaction in which energy is released). However heat will be transferred to the surroundings when Zinc and Sulphate form a bond so this is an exothermic process. The overall reaction will be exothermic because more energy is released when bonds are formed than is needed initially to break the bonds. This chemical reaction happens between every effective collision of Zinc and Copper Sulphate atoms.Therefore increasing the weight of Zinc poured into the copper sulphate solution increases the number of Zinc atoms. So there will be more collisions and they will occur more frequently, increasing the probability of an effective collision. Consequently more chemical bonds will brake; more heat will be produced, and the temperature will rise to a higher extent.Obtaining...

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