Factors Affecting Reaction Rates Lab Laboratory Questions Explain how each of th
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Question
Factors Affecting Reaction Rates Lab
Laboratory Questions
Explain how each of these treatments affected the reaction rate. Describe the effect at a molecular level.
A. Temperature
B. Concentration
How did the addition of copper(II) sulfate affect the reaction rate? Did the amount of catalyst affect the reaction rate?
Use the rate-law expression you determined for Data Table 7 to answer the following questions.
If the concentration of I– was doubled, how would that affect the reaction rate?
If the concentration of H2O2 was halved, how would that affect the reaction rate?
If the concentrations of I– and H2O2 were doubled, how would that affect the reaction rate?
If the concentration of H+ (HCl) was doubled, how would that affect the reaction rate?
Explanation / Answer
Rate = (rate constant) (Ca^n)
A. Temperature is considered a major factor that affects the rate of a chemical reaction. It is considered a source of energy in order to have a chemical reaction occur. Svante Arrhenius, believed that the reactants in a chemical reaction needed to gain a small amount of energy in order to become products. He called this type of energy the activation energy. The amount of energy used in the reaction is known to be greater than the activation energy in the reaction. Arrhenius came up with an equation that demonstrated that rate constants of different kinds of chemical reactions varied with temperature. This equation indicates a rate constant that has a proportional relationship with temperature. For example, as the rate constant increases, the temperature of the chemical reaction also increases.
Arrhenius' equation :
ln(k2/k1)=Ea/R(1/T11/T2)
B. As we have seen from main rate equation rate is propartional to concentration. More the molecules, more the reaction rates will proceed.
2. For time sake let us put copper sulfate aside, we will see how catalyst affect reaction rate.
for every reaction it need some energy to activate and participate in the reaction, Activation energy we call. If activation energy is more reaction needs more energy to cross the barrier and to participate in the reaction. Less the activation energy less is the energy amount required to participate in reaction.
So if you add catalyst to any reaction it decreases the activation energy barrier and speed up the rate of reaction.
Copper sulphate is used as catalyst frequently because its high availability and acts as good catalyti agent than other catalysts.
3. Need data of Table 7
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