Question

8 of 15 If the sign of a reaction rate is positive, that means The reaction does not go in the reverse direction It must be the rate for the appearance of a product. The reaction is an endothermic reaction. The reaction is an exothermic reaction. 9 of 15 Temperature increase often increases the reaction rate at least initially of both endo- as well as exothermic reactions. Which explanation best supports this? All reactions start out initially as endothermic reactions so require heat. There is an increase in collisions so more chance to form the activated complex. There is an increase in energy so more energy to react All reactions have an initial activation energy that must be overcome

Answer 1

solution (8 it the sign of a reaction rate is positive, that means It must be the date for the appearance of a product. Let a reaction. A+B C sate = -d[A] - -d[B] - d [c] = dt 1 dt dt d[A], d[B], d[c] represent change in - concentration of A, B &c in time dt. rate for product has positive sign so, option (B) is correct

6 Temperature increase often the reaction sate at least of both endo-as well as increases initially exothermic Yeactims. Explaination: Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. the collisions which possessing at least the activation energy for reaction, result in a reaction. So, option (B) collisions so the activated There is an more chance complex. increases in to form.