Define oxidation in terms of oxygen.
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Define oxidation in terms of oxygen.
Oxidation is any reaction in which a substance gains oxygen.
Define reduction in terms of oxygen.
Reduction is a reaction in which a substance loses oxygen.
What is oxidised in the following reaction in terms of oxygen?
Zn + CuO → ZnO + Cu
In Zn + CuO → ZnO + Cu, the zinc / Zn is oxidised as it gains oxygen to become zinc oxide / ZnO.
Define the term redox reaction.
A redox reaction is when oxidation and reduction take place simultaneously.
What does the Roman numeral in iron(III) oxide tell us?
The roman numeral tells us the oxidation number of the iron.
What is the charge of copper in copper(II) chloride?
The copper has a 2+ charge in copper(II) chloride.
True or False?
Iron(II) oxide has the formula Fe2O3.
False.
Iron(II) oxide has the formula FeO. Fe2O3 is the formula for iron(III) oxide.
Which substance is oxidised in the following reaction?
SnO2 + 2C → Sn + 2CO
In the reaction SnO2 + 2C → Sn + 2CO, carbon (C) is oxidised because it has gained oxygen.
What is the name of CoCl2?
The name of CoCl2 is cobalt(II) chloride.
Define oxidation in terms of electrons.
(Extended Tier Only)
Oxidation is the loss of electrons.
Define reduction in terms of electrons.
(Extended Tier Only)
Reduction is the gain of electrons.
What is oxidised in the following reaction?
Mg + Cu2+ → Mg2+ + Cu
(Extended Tier Only)
In Mg + Cu2+ → Mg2+ + Cu, magnesium (Mg) is oxidised as it loses electrons.
Define the term spectator ions. (Extended Tier Only)
Spectator ions are ions that appear unchanged on both sides of a chemical equation and do not participate in the reaction.
Define the term oxidising agent in terms of electrons. (Extended Tier Only)
In terms of electrons, an oxidising agent accepts electrons.
An oxidising agent is reduced.
What is the oxidising agent in the following reaction?
Cu + 2Ag+ → Cu2+ + 2Ag
(Extended Tier Only)
The oxidising agent in the following reaction is Ag+ as it has been reduced / gained electrons.
Cu + 2Ag+ → Cu2+ + 2Ag
Which species is oxidised in the following reaction?
Fe + Cu2+ → Fe2+ + Cu
(Extended Tier Only)
In the reaction Fe + Cu2+ → Fe2+ + Cu, iron (Fe) is oxidised as it loses electrons to become a positive ion.
True or False?
In oxidation, the oxidation number of an element decreases. (Extended Tier Only)
False.
In oxidation, the oxidation number of an element increases.
True or False?
The sum of oxidation numbers in a compound is always zero. (Extended Tier Only)
True.
The sum of oxidation numbers in a compound is always zero.
What is the oxidation number of N in NO2? (Extended Tier Only)
The oxidation number of N in NO2 is +4.