Which of the following factors will influence the rate of all chemical reactions?

• A. Concentration of reactants
• B. Temperature
• C. Surface area of solids
• D. Presence of a catalyst

Answer: (B)

Verified step by step guidance

1. Understand that the rate of a chemical reaction depends on factors that affect how often and how energetically reactant particles collide.
2. Recognize that concentration of reactants influences reaction rate only for reactions involving substances in solution or gas phase, not all reactions universally.
3. Know that surface area of solids affects reaction rate only when a solid reactant is involved, so it does not influence all reactions.
4. Recall that catalysts speed up reactions by lowering activation energy but are not always present in every reaction, so they do not influence all reactions.
5. Identify temperature as the factor that universally influences the rate of all chemical reactions because increasing temperature increases the kinetic energy of particles, leading to more frequent and energetic collisions.