Which of the following pairs of elements is most likely to form an ionic compound?

a. oxygen and sulfur

b. nitrogen and chlorine

c. nickel and aluminum

d. magnesium and fluorine

The activation energy for this reaction is 75 kj·mol–1. the enzyme catalase (found in blood) lowers the activation energy to 8.0 kj·mol–1. at what temperature would the non-catalyzed reaction need to be run to have a rate equal to that of the enzyme-catalyzed reaction at 25°c?