Question

1. factors that increase the speed of chemical reactions include

a. increasing the temperature.
b. increasing the particle size.
c. increasing the concentration of the reactants.
d. catalysts.

Explanation:

Increasing temperature provides more kinetic energy to reactant - molecules, increasing collision frequency and energy, thus speeding up reactions. Increasing reactant - concentration increases the number of reactant molecules in a given volume, leading to more frequent collisions and faster reactions. Catalysts lower the activation energy of a reaction, allowing it to proceed more quickly. However, increasing particle size decreases the surface - area to volume ratio, reducing the contact between reactants and slowing down the reaction.

Answer:

A. increasing the temperature, C. increasing the concentration of the reactants, D. catalysts