Question

which of the following gas contains nitrogen? A) Ammonia B) carbon dioxide C) Hydrogen sulphide D) Hydrogen chloride​

Answer 1

a) Hydrogen gas combines with nitrogen to form ammonia.

H
2
​
(g)+N
2
​
(g)→NH
3
​


The balanced equation for this reaction can be written as:

3H
2
​
(g)+N
2
​
(g)→2NH
3
​



(b) Hydrogen sulphide gas burns in air to give water and sulphur dioxide.

H
2
​
S(g)+O
2
​
(g)→H
2
​
O+SO
2
​


The balanced equation for this reaction can be written as:

2H
2
​
S(g)+3O
2
​
(g)→2H
2
​
O+2SO
2
​



(c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.

BaCl
2
​
+Al
2
​
(SO
4
​
)
3
​
→AlCl
3
​
+BaSO
4
​
↓

The balanced equation for this reaction can be written as:

3BaCl
2
​
+Al
2
​
(SO
4
​
)
3
​
→2AlCl
3
​
+3BaSO
4
​
↓


(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.

K+H
2
​
O→KOH+H
2
​


The balanced equation for this reaction can be written as:

2K+2H
2
​
O→2KOH+H
2
​