topic 9 - kinetics I

Question 1

what is the collision theory

Answer 1

for a chemical reaction to occur, reactants must:
- physically collide
- have sufficient energy to react ( required activation energy )

Question 2

how to increase rate of reaction in terms of collision theory

Answer 2

• increase frequency of collisions
• increase energy of reactants
• lowering activation energy

Question 3

how to increase rare of reaction

Answer 3

• increase concentration ( increased number of molecules per unit volume, increasing frequency of collisions )
• increase pressure ( increased number of molecules per unit volume, increasing frequency of collisions)
• increase surface area ( more reactant exposed, increase frequency of collisions )
• increase temperature ( gain kinetic energy , more sufficient energy to react, increasing frequency of collisions )
• catalyst ( lowers activation energy, more particles have sufficient energy to react )

Question 4

what are the 2 different types of catalysts

Answer 4

• heterogenous ( catalyst in different state state to the reactants )
• homogenous ( catalyst in the same state as the reactants )

Question 5

benefits of using a catalyst

Answer 5

• increased rate at lower temperatures and pressures
• less energy needed
• lower economic and environmental cost