IB Diploma Programme (DP) - SL & HL · Chemistry

Structure 2.2—The covalent model: Practice Questions

5 multiple-choice questions marked as you go, and 3 written questions with worked solutions. All on Structure 2.2—The covalent model.

8 questions21 marksFree, no account

Question 1

1 mark

Which of the following compounds contains a dative (coordinate) covalent bond?

Question 2

1 mark

How many sigma ($\sigma$) and pi ($\pi$) bonds are present in a molecule of ethyne, $C_2H_2$?

Question 3

1 mark

Which molecule is polar but contains non-polar bonds?

Question 4

1 mark

Which of the following best describes the fundamental nature of a covalent bond?

Question 5

1 mark

Which set of molecules is arranged in order of decreasing bond angle?

Question 6

4 marks

Describe how a dative (coordinate) covalent bond differs from a normal covalent bond.

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Question 7

5 marks

Explain how the concept of delocalized pi electrons in the nitrate ion ($$NO_3^-$$) accounts for its observed bond lengths and overall stability, despite its individual resonance structures suggesting alternating single and double bonds.

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Question 8

7 marks

Consider the sulfite ion, $$SO_3^{2-}$$.

a) Draw all plausible Lewis structures for the sulfite ion, showing all valence electrons and formal charges where applicable. Identify the most stable resonance structure(s) based on formal charges.

b) Determine the electron domain geometry and molecular geometry around the central sulfur atom using VSEPR theory. State the approximate bond angle(s).

c) Discuss the hybridization of the central sulfur atom in the sulfite ion.

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