Question

reaching the transition state in a chemical reaction is more likely under what conditions?
higher temperature and higher concentrations of reactants
lower concentrations of reactants only
lower temperature and lower concentrations of reactants
higher temperature only

Explanation:

Higher temperature provides more kinetic energy to reactant molecules, increasing the likelihood of successful collisions. Higher concentrations of reactants mean more molecules are present, also increasing the frequency of collisions and the probability of reaching the transition - state.

Answer:

Higher temperature and higher concentrations of reactants