Equilibrium

Question 1

Suggest why the colour of the mixture changes even though postition of equilibrium does not change [1]

Answer 1

particles forced closer together

Question 2

State what happens to the rates of the forward and backward reaction when temp is decreased [2]

Answer 2

forward decrease
backward decrease
(bc less ke)

Question 3

When hydrated barium chloride crystals are heated they give off water.
Describe how you can make sure all water is given off [2]

Answer 3

heat+weigh+repeat
until mass constant

Question 4

Reaction conditions of Haber process [4]

Answer 4

450 C
20000kpa
iron catalyst
equilibrium

Question 5

Describe how sulfur trioxide converted into sulfuric acid in Contact process [2]

Answer 5

added to concentrated h2so4
added to water

Question 6

Why is it important to add an excess of zinc carbonate? (making salt) [1]

Answer 6

to use up all acid

Question 7

Name a source of sulfur

Answer 7

fossil fuels

Question 8

Describe how oleum is made from sulfur by contact process give equations and reaction conditions [6]

Answer 8

S+O2->SO2
2SO2+O2⇌2SO3
vanadium (V) oxide
450 degrees celsius
sulfru trioxide dissolved in sulfuric acid