Chemistry 0620 · IGCSE · Elements, compounds and mixtures
Elements, compounds and mixtures — practice question
The substances in the list are shown below.
ammonia
calcium oxide
carbon monoxide
cobalt(II) chloride
ethane
ethanol
ethene
oxygen
potassium oxide
sodium sulfate
sulfuric acid
water
Use only the substances from this list to answer the questions.
Each substance may be chosen once, more than once, or not at all.
State the name of the substance which:
(a)[1]
is made during photosynthesis.
(b)[1]
belongs to the alkene homologous series.
(c)[1]
contains an ion with a $1-$ charge.
(d)[1]
is the substance used to remove sulfur dioxide during flue gas desulfurisation.
(e)[1]
is produced in a hydrogen-oxygen fuel cell.
(f)[1]
serves as a test for water.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “oxygen gas” …