Focus 4

Question 1

Explain how a compound can be formed through the loss and gain of electrons and sharing of electrons

Answer 1

Ionic bonds
Metal + non-metal
Transfer (loss or gain) of 1 or more electrons
Held together by electrostatic forces
the positive metal cation and negative metal anion attract

Covalent bonds
Non-metal + non-metal
Sharing of 1 or more electrons (to gain a more stable or full outer shell)
Held together by chemical bonds of shared electrons

Question 2

Describe the physical properties of Ionic compounds (salts)

Answer 2

Soluble (can dissolve)
(Generally) high melting point
Conduct in solution (when dissolved) or when melted

Question 3

Describe the physical properties of Covalent compounds (strongest bonds)

Answer 3

(Generally) insoluble
Low melting point
No conduction

Question 4

Describe the physical properties of Covalent networks

Answer 4

Insoluble
Very high melting point
(Generally) no conduction

Question 5

Describe the physical properties of Metallic compounds

Answer 5

Insoluble
High melting point
Conduct