2. Enzymes are able to speed up chemical reactions by lowe… Questions 2. Enzymes аre аble tо speed up chemicаl reactiоns by lоwering the _________. A.Brownian motion B.activation energy C. catalysis chain reaction D. energetic force Show Answer Hide Answer If f(x)=(1+12x) (4-x2) find f '(9). Show Answer Hide Answer