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IB DP Chemistry Questions

4.2 Covalent Bonding

Question 1

Which of the following best describes the octet rule in covalent bonding?

A. Atoms tend to lose or gain electrons to achieve a full outer shell of 8 electrons.

B. Atoms always have 8 electrons in their outermost shell.

C. Atoms bond covalently to achieve a total of 8 atoms.

D. Atoms always share 8 electrons in a covalent bond.

Question 2

Which type of covalent bond involves the sharing of six electrons between two atoms?

A. Single bond

B. Double bond

C. Triple bond

D. Quadruple bond

Question 3

Which molecule is non-polar despite having polar covalent bonds?

A. H2O

B. CO2

C. NH3

D. HCl

Question 4

Which of the following molecules has the highest dipole moment?

A. CH4

B. NH3

C. H2O

D. BF3

Question 5

Which of the following best describes the bond in Br2?

A. Polar covalent

B. Non-polar covalent

C. Ionic

D. Metallic

Question 6

a) Describe the difference between a single, double, and triple covalent bond. [3]

b) How does the strength of these bonds vary and why? [2]

Question 7

a) What is meant by the term 'electronegativity'? [2]

b) How does the difference in electronegativity between two atoms determine the polarity of the bond they form? [3]

Question 8

a) Explain the significance of the octet rule in covalent bonding. [3]

b) Are there any exceptions to the octet rule? Provide an example. [2]

Question 9

a) Explain how the concept of hybridisation occurs in covalent bonding and provide an example. [3]

b) Describe the concept of resonance in covalent molecules and its significance. [3]

c) Discuss the effect of bond polarity on the physical properties of covalent compounds. [2]

Question 10

a) Explain the concept of dipole moment in a covalent bond and how it is determined. [3]

b) Compare and contrast the characteristics of polar and non-polar covalent molecules. [3]

c) Provide an example of a molecule with polar covalent bonds and one with non-polar covalent bonds, and explain the reasons for their polarity or non-polarity. [2]

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