30 Questions
What is the oxidation number of an atom in a chemical compound or in a polyatomic ion?
The theoretical ion charge of the atom.
What is the fundamental property of redox reactions?
One participant will be oxidised and another participant will be reduced by the transfer of one or more electrons.
What happens when a particle is reduced?
Its oxidation number decreases.
What is the sum of a reduction reaction and an oxidation reaction?
A redox reaction.
Why are Roman numbers used for oxidation numbers?
To avoid confusion with charges of ions.
What is the oxidation number of Fe2+ in the reaction Fe3+ + e- → Fe2+?
+II
What happens to the oxidation number of a particle when it is oxidised?
The oxidation number increases.
What is the function of an oxidising partner in a redox reaction?
To be reduced
What is the definition of a reduction in a chemical reaction?
The reception of one or more electrons by a reactant.
What is the oxidation number (ON) of oxygen in a compound?
-II
How are chemical names written to include the oxidation number of the cation?
In roman numbers in round brackets.
What is the minimum requirement for a reaction to be considered a redox reaction?
Transfer of one or more electrons
What is the oxidation number of single atomic particles with no charge and elements?
Zero (±0).
What is the sum of oxidation numbers of all atoms in a molecule without a charge?
Always ±0.
What is the oxidation number (ON) of an element?
±0
What happens to the oxidation number (ON) of M in the reaction M + O2 → MO?
Increases by 2
What happens to the oxidation number of a reactant when it releases one or more electrons?
The reactant gets oxidised.
Which of the redox pairs has the highest redox potential?
Ag+/Ag
What is the purpose of adding NH3 (c = 2 mol/L) to the solution in the experiment?
To observe the reaction and identify the product
What is the oxidising agent in the reaction between copper and nitric acid?
Nitric acid (HNO3)
What is the purpose of using deionised water in the experiment?
To dilute the concentrated nitric acid and prevent overheating
What is the role of the gas collecting device in Experiment 4.2?
To collect and identify the gas produced during the reaction
Why is it important to wear gloves and eye protection during the experiment?
To prevent injury from chemicals and heat
What is the difference in the reaction between aluminium and hydrochloric acid versus nitric acid?
The products and reaction rates differ between the two acids
What is the purpose of the gas collecting device in the experiment?
To identify the produced gas.
Why does the reaction of HCl with Aluminium need a significant amount of time to speed up?
Because the Aluminium surface is initially covered with a passivating compound that slows down the reaction.
Why do we not see a reaction happen between Aluminium and HNO3?
Because the passivating compound on the Aluminium surface completely blocks the reaction with HNO3.
What gas is produced according to the test with the gas collecting device?
The answer will depend on the actual experiment and observation, but typically it is hydrogen gas.
What is the purpose of writing the reaction equation of the formation of the compound on the surface of Aluminium?
To understand the process that slows down the reaction with HCl and blocks the reaction with HNO3.
Is the reaction between HCl and Aluminium a redox reaction?
Yes, it is a redox reaction.
In this quiz, you'll learn how to determine oxidation numbers, identify oxidizing and reducing agents, and form redox reactions. This quiz focuses on qualitative experiments and theoretical understanding of redox reactions, without calculating concentrations, volumes, masses, or pH values.
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