Rate Constants and Temperature Quiz | A-Level Chemistry OCR

Welcome to the Quiz!

This quiz contains 7 questions from a mix of 1 subtopics.

What is the logarithmic form of the Arrhenius equation?

ln(k)=−RTEa+ln(A)

ln(k)=RTEa−ln(a)

ln(k)=RTEa+ln(A)

ln(k)=−RTEa−ln(A)

In an Arrhenius plot, does the line of best fit in the graph of ln k against T1 have a positive gradient or a negative gradient?

positive gradient

negative gradient

In an Arrhenius plot, what is the gradient of the line of best fit equal to?

−RTEa

−Ea×R

−REa

e−REa

What are the units of activation energy, E_a, when used in the Arrhenius equation?

J K^-1 mol^-1

kJ K^-1 mol^-1

kJ mol

J mol^-1

Calculate the activation energy, in kJ mol^-1, from the Arrhenius plot above. Give your answer to 3 significant figures.

R = 8.31 J K^-1 mol^-1

99.72

kJ mol^-1

Why does the rate of reaction increase as temperature increases?

(Select all that apply).

the number of molecules increases

the frequency of collisions increases

the proportion of molecules with the correct orientation increases

the proportion of molecules with the activation energy increases

In an Arrhenius plot, what is the y-intercept of the line of best fit equal to?

ln A

E_a

ln E_a