Answer:
It's either B or D, I'm not positive which it is
Explanation:
When the reactants are heated, the average kinetic energy of the molecules increases. This means that more molecules are moving faster and hitting each other with more energy. If more molecules hit each other with enough energy to react, then the rate of the reaction increases.
Answer:
part of input energy is wasted
it is used to increase the entropy of the surrounding
therefore the useful energy output is necessarily smaller than the energy input
in other words the efficiency of heat engine is always less than hundred percent