the number of molecular collisions increases ...
the number of molecular collisions increases when\na products are removed.\nb more reactants are added.\nc the reaction temperature is lowered.\nd the reacting molecules have an incorrect orientation upon impact.
Answer
# Brief Explanations:
- **Option A**: Removing products affects the equilibrium position but not the number of molecular collisions directly.
- **Option B**: Adding more reactants increases the concentration of reactant molecules. According to the collision theory, when the concentration of reactants is higher, there are more molecules in a given volume. This leads to a higher frequency of molecular collisions.
- **Option C**: Lowering the reaction temperature decreases the kinetic energy of molecules. Molecules move more slowly, so the number of molecular collisions decreases.
- **Option D**: Incorrect orientation upon impact affects whether a collision will result in a reaction (i.e., it affects the effectiveness of collisions), but it does not increase the number of collisions.
# Answer:
B. more reactants are added.