Chemistry 0620 · IGCSE · Elements, compounds and mixtures
Elements, compounds and mixtures — practice question
A set of substances is shown.
aluminium oxide, carbon dioxide, carbon monoxide, chlorine, copper, glucose, iron(III) oxide, limestone, nitrogen, oxygen
Use the substances in the list to answer the questions.
Each substance can be chosen once, more than once, or not used at all.
State which substance is:
(a)[1]
a product produced by respiration
(b)[1]
the principal constituent of hematite
(c)[1]
an element whose sulfate is used for the water test
(d)[1]
a toxic, colourless gas
(e)[1]
a substance that reacts in fermentation
(f)[1]
a reducing agent used in iron extraction
(g)[1]
a solid conductor of electricity
(h)[1]
a gas that makes up approximately 21% of clean, dry air
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “carbon dioxide gas” …