Rate of reaction

Question 1

What can affect rate of reaction?

Answer 1

[COLLISION THEORY (more frequent collisions, more successful collisions)]:
pressure - because lower pressure, particles are more spaced out, higher pressure, particles are more packed or closer together. collision theory
temperature - because the particles will have more kinetic energy if temperature increase. collision theory, particles move faster, rate of reaction increases
concentration - more particles per unit volume. collision theory
surface area - larger surface area so therefore more area for the particles to collide. collision theory

When collision theory is mentioned, explain collision theory in the definition given.