Check my answers ! 1.which of the following conditions increases the number of collisions between reactant molecules in a given volume? decreasing the temperature adding more reactant molecules (correct) making the particles clump together removing a catalyst 2.for this chemical reaction ch3br + oh- = ch3oh + br-, which of the following would indicate that the reaction occurred? increase in ch3br concentration over time or decrease (answer decrease) increase in oh concentration over time or decrease