Which of the following statements correctly explains why a smaller particle size makes nanoparticles extremely effective catalysts?
Decreasing particle size increases the surface-area-to-volume ratio, exposing more active sites for reactions.
Decreasing particle size decreases the surface-area-to-volume ratio, increasing the density of the material.
Decreasing particle size decreases the total surface area, focusing collisions into a smaller space.
Decreasing particle size increases the mass of the particles, raising their kinetic energy.
48 exam-style questions on OCR GCSE Chemistry Properties of materials. Each one has a worked solution and a mark scheme showing where the marks go.