Which element removes oxygen from iron(III) oxide in the industrial extraction of iron?
Copper
Calcium
Carbon
Which of these is a description of oxidation?
The gain of oxygen
The loss of oxygen
The gain of hydrogen
Which of these elements is a transition element?
Chlorine
Which property is typical of transition elements?
They form ions with different charges
They are not strong
They are in the gas state at room temperature
Where are the transition metals found in the periodic table?
On the left of the periodic table, in groups 1 and 2
In the middle of the periodic table, between groups 2 and 3
On the right of the periodic table, in groups 7 and 8
Which of these is a property of transition metals?
Malleable
Brittle
Low melting point
Which substance is the reducing agent in this reaction?
Fe2O3 + 3CO → 2Fe + 3CO2
Fe2O3 (Iron(III) oxide)
CO (Carbon monoxide)
CO2 (Carbon dioxide)
Which of these equations shows reduction taking place? [Higher tier only]
Mg → Mg2+ + 2e
Cu - 2e → Cu2+
Cu2+ + 2e → Cu
What is the purpose of adding limestone to a blast furnace?
To remove impurities, eg sand, from the reaction
To burn and provide the heat needed for the reaction to occur
To reduce the iron(III) oxide in iron ore which then produces iron metal
When iron(III) compounds react with sodium hydroxide solution, a precipitate of iron(III) hydroxide is produced. Which of the following is the correct ionic equation?
Fe3+(aq) + 3OH–(aq) → Fe(OH)3(s)
Fe3+ Cl–(aq) + 3Na+ OH–(aq) → Fe3+(OH–)3(s) + Na+Cl–(aq)
Fe3+(aq) + 3OH–(aq) → Fe(OH)3(aq)