Аммиакты өнеркәсіпте алу. Химия, 11 сынып, дидактикалық материал.

Жұмыс парағы

1.

• Fertilizers often contain ammonium nitrate.

(a)Describe a test for nitrate ions.

……..........................................................................................................................

............................................................................................................................. [2]

(b)Ammonium nitrate can be made by adding nitric acid to a solution of ammonia.

(i)What type of reaction is this? …………………………….. [1]

(ii)Complete the chemical equation for this reaction.

………… + HNO₃(aq) ……….NH₄NO₃(aq) [1]

(c)Which two of the following statements about ammonia are true?

Tick two boxes.

ammonia is insoluble in water

ammonia turns red litmus blue

a solution of ammonia in water has a pH of 7

ammonia has a molecular structure [2]

4

The reaction can be represented by this equation.

N₂ (g) + 3H₂ (g) 2NH₃ (g)

(a)Calculate the maximum mass of ammonia that could be made from 1000g of nitrogen.

[3]

(b)At a temperature of 450 ºC and 200 atmospheres the actual mass of ammonia produced when 1000 g of nitrogen is passed through the reactor is 304g. Calculate the percentage yield of ammonia produced in the reactor. [2]

(c)State:

(i)how a decrease in temperature would affect the yield of ammonia.

[1]

...........................................................................................................

(ii)how an increase in pressure would affect the yield of ammonia.

[1]