Chemistry 0620 · IGCSE · Carboxylic acids

Carboxylic acids — practice question

This question concerns alcohols, carboxylic acids and esters.
(a(i))[1]

State the other condition needed for this reaction to happen.

(a(ii))[1]

State the type of chemical change that occurs to the ethanol in this reaction.

(a(iii))[3]

Complete the dot-and-cross diagram to show the electron arrangement in a molecule of ethanoic acid.

(b)[6]

Complete the table.

(c(i))[1]

Name the other product made when ethanoic acid reacts with an alcohol to produce this ester.

(c(ii))[1]

Give one condition needed when ethanoic acid reacts with the alcohol to make this ester.

(c(iii))[2]

Draw the structure of the alcohol that was mixed with ethanoic acid to make this ester. Show every atom and every bond.

(d(i))[1]

State what the term functional group means.

(d(ii))[1]

Determine the empirical formula of hexanedioic acid.

(d(iii))[2]

Calculate the percentage by mass of oxygen in ethanediol. Give your answer to the nearest whole number.

(d(iv))[2]

Complete the diagram to show a section of polyester produced from hexanedioic acid and ethanediol. Include every atom and every bond in the linkages.

(d(v))[1]

State the name of a polyester.

Worked solution & mark scheme

This 22-mark question has a full step-by-step worked solution and mark scheme. One marking point: presence of an acid

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