#1. "the partial pressure of one gas in a mixture is independent of the other in the mixture." Is this statement true or false? I think it's false. The partial pressure of one gas is the product of total pressure and mole fraction of that gas. Mole fraction is dependent of the proportion of one gas and the other gas. Therefore, the statement given is false. right? BUT THE ANSWER IS TRUE. WHY? #2. catalysts have which of the following effect on chemical reactions? a. increase the rate at which product is formed. b. lower the energy of formation of the products. ==> of course, a is right, but why not b? the energy mentioned in B is activation energy or enthalpy? If it is activation energy, then B can also be the answer, but if it is enthalpy, B cannot be the answer. how can we tell??