Tutorial Questions

Question 1

Hydrogen chloride gas does not conduct electricity. An aqueous solution of
hydrogen chloride conducts electricity. Explain why hydrogen chloride behaves
differently as a gas and as an aqueous solution.

Answer 1

Hydrogen chloride gas is a covalent compound with no mobile ions or electrons. upon dissolving in water, it ionizes to form mobile H+ and Cl- ions which will be able to move and carry electric current to conduct electricity.

Question 2

explain why magnesium oxide has a higher melting point than sodium oxide?

Answer 2

this is because in magnesium oxide, magnesium (Mg) and oxygen (O) has higher charges (2+ for Mg and 2- for O) compared to sodium oxide, which have lower charges of ( 1+ for Na and 2- for oxygen.) hence, the stronger the ionic bond requires more amount of heat energy to overcome the strong electrostatic forces of attraction between the oppositely charged ions. thus, the combinition of stronger ionic bond and tightly packed lattice structure results in higher melting point in Magnesium oxide compared to sodium oxide.

Question 3

name all these
CuCl
ZnSO4
Mg(NO3)2
NH4NO3

Answer 3

1) copper (I) chloride
2) zinc sulfate
3) magnesium nitrate
4) ammonium nitrate