Test Yourself 5.5 (Textbook) – Chemistry Form 4 Chapter 5 (Chemical Bond)


Question 1:
What is dative bond?

Answer:
Dative bond or coordinate bond is a type of covalent bond where the shared pair of electrons originate from one atom only.


Question 2:
Explain the formation of ammonium ion through the formation of dative bond between hydrogen ion, H+ and nitrogen atom, N in ammonia, NH3.

Answer:
Hydrogen ion, H+ does not have any electron in its shell. The nitrogen atom in ammonia has a pair of electrons that can be shared with the hydrogen ion. The shared electrons form a dative bond.


Question 3:
Boron atom, B found in the compound boron trifluoride, BF3 has not achieved octet electron arrangement because it has only six valence electrons. Can boron atoms, B form dative bonds with nitrogen atoms, N in the compound ammonia, NH3?
Explain your answer.

Answer:
Can. The nitrogen atom in ammonia has a pair of electrons that can be shared with the boron atom in boron trifluoride through the formation of a dative bond so that the boron atom can have a stable octet electron arrangement.