Consider the following chemical equations:
2.1 Define the term covalent bond. (2)
2.2 Write down the Lewis structure for the CH4 molecule. (2)
2.3 Consider the bonds C – H and O – H
Which bond …
2.3.1 has a longer bond length? Give a reason for your answer.
2.3.2 is stronger? (1)
2.4 How many lone pairs of electrons are in the central atom of the H2O
molecule? (1)
2.5 Write down the formula of a substance in reaction II that has a dative
covalent bond. (1)
2.6 The NH3 molecule is POLAR but the CH4 molecule is NON-POLAR.
Explain this observation. (4)
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