4.2 Collision Theory And Surface Area

Question 1

What is the minimum energy called for a reaction to start?

Answer 1

Activation energy

Question 2

Name 5 factors that affect the chance of collisions and ultimately the rate of reaction

Answer 2

• temperature (particles have more kinetic energy to move and collide)
• concentration of solutions (higher concentration has more reactant particles so collide more)
• pressure of gases
• surface are of solids (higher SA of solids means that they will collide more frequently)
• using a catalyst

Question 3

Why are reactions faster with powders than large pieces?

Answer 3

They have a larger surface area so more collisions happen in the same time

Question 4

What does the collision theory state?

Answer 4

Reactions can only happen if particles collide with enough energy to change into new substances