End of chapter test

Covalent bond is formed by the …………. of electrons between atoms

• transfering
• sharing
• losing
• gaining

The number of bonding electrons is EQUAL to the number of shared electrons.

• true
• false

Each lone pair of electrons is represented by a line.

• true
• false

The numbers of bonding and non-bonding electrons in this molecule are….

• 4 and 10
• 10 and 4
• 4 and 5
• 10 and 5

Which group includes covalent molecules which have ONLY single bonds?

• Cl2, O2, NaCl
• H2, H2O, CH4
• Cl2, H2, CO2
• HCl, HF, N2

• There is a double covalent bond.

• There are 2 unshared electrons.

• It has high melting and boiling point.

• It can't conduct electricity in molten state.

Which statement is FALSE?

• Covalent bond is strong

• In the formation of covalent bonds, no charged particles is formed
• Covalent bond is formed between non-metals

• Atoms achieve octet configuration after forming covalent bonds

Each line in the structural formula of covalent molecules represents two non-bonding electrons.

• true
• false

A double bond represents 2 bonding electrons

• true
• false

How many lone pairs are there in a water molecule?

(WRITE A NUMBER)