O-LevelChemistryOrganic Chemistry5070/22 · May/June 2017 · Q58 Marks
Ethanoic acid and butanoic acid are both carboxylic acids. H O-H H-C-C=ʬ H ethanoic acid HHH O-H H-C—C—C—C ΗΗΗ butanoic acid
- (a)Name a reagent that can be used to make ethanoic acid from ethanol.[1]
- (b)(i)Dilute ethanoic acid reacts with all carbonates and with some metals. Name one metal that will react with dilute ethanoic acid and name the products of this reaction. name of metal products[2]
- (b)(ii)Construct an equation to show the reaction of dilute ethanoic acid with calcium carbonate.[2]
- (c)Draw the structure of a carboxylic acid that is an isomer of butanoic acid. Show all of the atoms and all of the bonds.[1]
- (d)(i)Lactic acid is both an alcohol and a carboxylic acid. CH₃ OH HO-C-C H Lactic acid is a monomer that can be polymerised to form a polyester. What type of polymerisation occurs during this reaction?[1]
- (d)(ii)This polyester is biodegradable. Suggest an advantage of a polymer being biodegradable.[1]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- A5(a) (Acidified) potassium manganate(VII) / oxygen
- A5(b)(i) Lithium / sodium / potassium / calcium / magnesium (1) Corresponding ethanoate AND hydrogen (1)
- A5(b)(ii) CaCO₃ + 2CH₃CO₂H → Ca(CH₃CO₂)₂ + H₂O + CO₂ (2) IF: two marks not scored H₂O and CO₂ as products = 1 mark
- A5(c) H H-C-H H O H-C-C-C-O-H H H
- A5(d)(i) Condensation
- A5(d)(ii) Decomposes / decays / will not fill up land-fill sites / less litter/ no need for incineration
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →