Welcome back — missed you this week. Here are some Jamb questions on physics (collision theory): 1. According to collision theory, for a reaction to occur, reactant particles must: A. Be moving at high speeds B. Collide with sufficient energy and proper orientation C. Be in the gaseous state D. Be present in high concentrations Answer: B. Collide with sufficient energy and proper orientation. Collision theory states that for a reaction to happen, particles need to collide with enough kinetic energy (activation energy) and in the correct spatial arrangement so that bonds can break and new ones can form. 2. Which of the following factors will not increase the rate of a chemical reaction according to collision theory? A. Increasing temperature B. Increasing concentration of reactants C. Adding a catalyst D. Decreasing the surface area of solid reactants Answer: D. Decreasing the surface area of solid reactants. Decreasing the surface area reduces the number of reactant particles exposed to collide, thus slowing down the reaction rate. Increasing temperature, concentration, and adding a catalyst all increase the frequency and/or energy of collisions, leading to a faster reaction. 3. The minimum energy required for reactant particles to overcome the energy barrier and form products during a collision is known as the: A. Kinetic energy B. Potential energy C. Activation energy D. Transition energy Answer: C. Activation energy. This is the energy threshold that must be met or exceeded during a collision for a reaction to proceed. 4. A catalyst increases the rate of a reaction by: A. Increasing the activation energy B. Decreasing the number of collisions C. Providing an alternative reaction pathway with lower activation energy D. Increasing the number of reactant particles Answer: C. Providing an alternative reaction pathway with lower activation energy. Catalysts do not get consumed in the reaction and offer a different mechanism that requires less energy to initiate, thus speeding up the process. Send me the next one 📸