Topic 6

Question 1

Collision theory

Answer 1

• frequency of collisions
• energy transferred during collisions (successfulness)

1. Concentration
   - more particles likely to collide in the same volume
2. Pressure
   - same number of particles collide in a smaller volume
3. Surface Area
   - same volume of reactant but more area for particles to collide
4. Temperature
   - more eK, more successful collisions
5. Catalyst
   - not part of overall reaction
   - decreases amount of a. energy needed
   - provides alternative reaction pathway

Question 2

PRACTICALS :

Question 3

Reversible reactions

Answer 3

• concentration of ➡️ reaction slows down as products are made
• concentration of products increases so system reaches equilibrium
• both reactions still take place with no overall effect
• position of equilibrium depends on temp., pressure and concentration

Question 4

EXAMPLE : Reversible reaction

Answer 4

Thermal decomposition of hydrated copper sulfate

• heating BLUE hydrated CuSO4 crystals removes water
• WHITE anhydrous CuSo4 powder is left
  (ENDOTHERMIC)
• adding a couple drops of 💧 to powder brings back crystals (EXOTHERMIC)

Question 5

La Chatelier’s Principle

Answer 5

The position of equilibrium shifting to counteract change

⬇️ in temp. moves equilibrium in the EXO direction to produce more heat 🔥 there will be more products for the EXO reaction ( vice versa )

⬇️ pressure moves equilibrium to direction with more gas molecules

A change in concentration on either side STOPS equilibrium so system responds by !TRYING! to bring it back