Which conditions will increase the rate of chemical reaction?
A. Decreased temperature and decreased concentration of reactants.
B. Decreased temperature and increased concentration of reactants.
C. Increased temperature and decreased concentration of reactants.
D. Increased temperature and increased concentration of reactants.
Rate or speed of reaction is influenced by temperature, concentration, surface area, nature of reactants, and presence of a catalyst. To speed up a reaction, increase the number of effective collisions between molecules. Temperature is a measure of the average kinetic energy, so increasing temperature speeds up a reaction. Increasing the concentration of the reactants adds more particles and this also increases the number of effective collisions.