Question

1. Write the name of the expected compound formed between
(i) hydrogen and sulphur
(ii) nitrogen and hydrogen
(iii) magnesium and oxygen​

Answer 1

Expected compounds will be -

1) Given elements : Hydrogen and sulphur.

The expected compound - Hydrogen sulphide. (Gaseous)

Chemical formula - H2S.

Reaction - 2H + S --- H2S

2) Given elements - nitrogen and hydrogen.

The expected compound - Ammonia. (gaseous)

Chemical formula - NH3.

Reaction - 3H + N --- NH3

3) Given elements - Magnesium and oxygen.

The expected compound - Magnesium oxide. (Solid)

Chemical formula - MgO.

Reaction - Mg + O ---- MgO.

Answer 2

When two compounds react with each other, they are forming a new compound and called a chemical reaction.

Explanation:

1. Hydrogen and sulphur are forming hydrogen sulfide due to the first reaction of sulphur with oxygen making sulphur dioxide.

This sulphur dioxide works as a catalyst and forms hydrogen sulfide.

2. A reaction between nitrogen and hydrogen results in ammonia, where "one molecule of nitrogen" and "three molecules of hydrogen" react with each other.

3. Magnesium and Oxygen are reacting with each other and forms a white powder of magnesium oxide.