O-LevelChemistryStoichiometry5070/11 · Oct/Nov 2018 · Q381 Mark

An ester is formed from a carboxylic acid and an alcohol. How does the number of carbon, hydrogen and oxygen atoms in an ester differ from the total number of these atoms in the carboxylic acid and alcohol from which the ester is formed?

Acarbon atoms: fewer, hydrogen atoms: fewer, oxygen atoms: fewer

Bcarbon atoms: fewer, hydrogen atoms: same, oxygen atoms: fewer

Ccarbon atoms: same, hydrogen atoms: fewer, oxygen atoms: fewer

Dcarbon atoms: same, hydrogen atoms: same, oxygen atoms: same

✓ Correct answer

C: carbon atoms: same, hydrogen atoms: fewer, oxygen atoms: fewer

Oracle Prep sorts past-paper questions by topic, so you can drill Stoichiometry and see which topics are most likely to come up next.

Topic: Stoichiometry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2018 Paper 1 Variant 1, question 38.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content