Hi everyone. I need some help on these specific problems. They are from Gen Chem

Question

Hi everyone. I need some help on these specific problems. They are from Gen Chem II Lab - The Clock Reaction. If any additional information is needed, please let me know. Thank you so much.

Questions 1. Doubling the number of drops of copper sulfate added should have little to no effect on the rate of reaction. Why? 2. If some of the water that was used to warm the reactants in Test 7 of Part C spilled into either of the beakers before they were mixed, would this have the effect of increasing or decreasing the rate of reaction relative to the value you reported? Explain.

Explanation / Answer

1. copper ion is not a good catalyst . It decreases the activation energy by small amount.

2. spilling of water should have decreased the rate of reaction since the rate depends upon the concentration of reactants and the concentration will decrease on addition of water.

3. Rate = P ZAB e –Ea/RT  

Where ZAB = the collision frequency of reactants A & B.

P= Probability or steric factor.

e –Ea/RT = fractions of molecules with energies equal to greater than Ea.

4. In case of iodine clock reaction, starch iodine complex will give blue black ppt.

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