CourseCourseConceptConceptDocsDocuments

CAIE A-Level Chemistry AS P3.1 Successful Collection of Data and Observations Questions

Practise collecting appropriate quantities of data and recording subtle experimental observations, including colour changes.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • record appropriate experimental observations and colour changes
  • collect suitable quantities of data using instructed apparatus
  • distinguish subtle visual changes accurately

CAIE A-Level Chemistry AS P3.1 Successful Collection of Data and Observations Questions question 1

[Maximum number: 1]

Aqueous bromine reacts with methanoic acid to form hydrogen bromide and carbon dioxide gas.

Br2(aq)+HCO2H(aq)→2HBr(aq)+CO2( g)\mathrm{Br}_{2}(\mathrm{aq})+\mathrm{HCO}_{2} \mathrm{H}(\mathrm{aq}) \rightarrow 2 \mathrm{HBr}(\mathrm{aq})+\mathrm{CO}_{2}(\mathrm{~g})

The table shows the oxidation numbers of bromine and carbon in the species involved in this reaction.

Table for Question CAIE A-Level Chemistry AS P3.1 Successful Collection of Data and Observations Questions question 1 — CAIE A-Level Chemistry AS

Suggest one change you would observe, ignoring temperature changes, when bromine reacts with methanoic acid.

All question bank results loaded