Solid sodium hydroxide is a base which dissolves to form an aqueous solution, $$\(\mathrm{NaOH}(\mathrm{aq})\)$$. Ethanoic acid, $$\(\mathrm{CH}_{3} \mathrm{COOH}\)$$, is a weak acid. Complete the dot-and-cross diagram in Fig. 4.1 of a molecule of ethanoic acid.
Exam No：0620_s23_qp_42 Year：2023 Question No：4(f)(i)
Answer:
M1 all single bonding dot and cross pairs correct
\(\mathrm{M} 2\) double \(\mathrm{C}=\mathrm{O}\) bond dot and cross pairs are correct
M3 complete diagram is correct
\(\mathrm{M} 2\) double \(\mathrm{C}=\mathrm{O}\) bond dot and cross pairs are correct
M3 complete diagram is correct
Knowledge points:
2.5.1. State that a covalent bond is formed when a pair of electrons is shared between two atoms leading to noble gas electronic configurations
2.5.2. Describe the formation of covalent bonds in simple molecules
2.5.3.1. low melting points and boiling points
2.5.3.2. poor electrical conductivity
2.5.4. Describe the formation of covalent bonds in simple molecules
2.5.5.1. low melting points and boiling points in terms of weak intermolecular forces (specific types of intermolecular forces are not required)
2.5.5.2. poor electrical conductivity
Solution:
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