A reaction is performed at two different temperatures, 200 K and 450 K. The rate

Question

A reaction is performed at two different temperatures, 200 K and 450 K. The rate constant is determined at each temp, and these are shown below. At temperature = 200 K: k 200 k = 1.7 times 10^-3 M/s At temperature = 450 K k 450 k = 2.4 times 10^-2 M/s Circle T if the statement is TRUE and F if it is FALSE (or not necessarily true). Explain each choice. Your explanation is 90% of the point value. T F The reaction at 200 K is more endothermic than at 450 K T F The reaction is faster at 450 K than at 200 K T F the reaction has a greater energy' of activation at 450 K than at 200 K T F the reaction has a larger equilibrium constant at 200 K than at 450 K.

Explanation / Answer

1) the statement is rxn at 200k is more endothermic than at 450K

As the rate constant is less at 200K than at 450K, that is with increase in temperature k increased and thus the statment is TRUE.

2)TRue.

The rae constant is direct measureof rate of reaction. Higher the rate constant higher the rate of reaction.

3) False

As the temperature increases, the energy of reactant molecules increases , thus the acivation energy is attained easily.

But the value of activation energy does not change.

4) False

As the rate of reaction is larger at 450K, the Keq is also larger at 450K than at 200kK

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