paper 2 Wrong

Question 1

Describe the test to identify sodium ions, give result of test

Answer 1

flame test, yellow flame

Question 2

In the haber process ammonia is produced from nitrogen and hydrogen. Why is the condenser linked to the reactor?

Answer 2

To recycle the remaining hydrogen and nitrogen

Question 3

In the haber process ammonia is produced from nitrogen and hydrogen. Which metal is used as a catalyst in this reaction?

Answer 3

Iron

Question 4

Suggest one use of ammonium nitrate

Answer 4

Fertilisers

Question 5

Water is decomposed into hydrogen gas and oxygen gas using electricity. Which two words describe this reaction.

Answer 5

Combustion and reversible

Question 6

Why is rf value of dyes not affected by how far the solvent front is allowed to travel?

Answer 6

the distance travelled by
the spot relative to the distance
travelled by the solvent is
constant

Question 7

Explain how kerosene is produced from these hydrocarbon vapours

Answer 7

there is a temperature gradient
in the (fractionating) column
(so) kerosene condenses
at the level (in the column)
corresponding to kerosene’s
boiling point (range)

Question 8

Explain why aluminium alloy bicycle frames do not need protection from corrosion?

Answer 8

aluminium (alloy) has an oxide
coating
(so) contact between aluminium
(alloy) and water / air / oxygen is
prevented

Question 9

Describe the test for the presence of sulfate ions in sulfuric acid.

Answer 9

Add barium chloride, white precipitate

Question 10

Explain why higher pressures to not get a higher yield is not used?

Answer 10

Jcrwaeed cost of safety precautions, risk of explosion increased