WorksheetsEletronegatividade
Total questions: 12
Worksheet time: 18mins
Tungsten can be extracted from its oxide, WO3, by heating it with carbon monoxide. Carbon dioxide is produced as shown below.
WO3+ 3CO → W + 3CO2
Explain, in terms of oxidation state, why tungsten in tungsten oxide has been reduced.
In a reaction, MnO4- is converted to Mn2+. Explain, in terms of electron transfer, if manganese (Mn) is oxidised or reduced.
WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION:
Consider the following REDOX reaction:
Cl2(g) → ClO−(aq) + Cl−(aq) (basic solution)
Which species is the result of oxidation?
Cl−
ClO−
Substance X changes aqueous potassium iodide from colourless to brown and changes aqueous potassium manganate(VII) from purple to colourless. Which statement correctly describes X?
It is an oxidising agent only.
It is a reducing agent only.
It is an oxidising agent and a reducing agent.
It is neither an oxidising agent nor a reducing agent.
What element is being Oxidized?
I0
H+1
S+4
O-2
What element is being reduced?
I0
H+1
S+4
O-2
Ammonia reacts with chlorine as shown:
2NH3 + 3Cl2 → N2 + 6HCl
State the oxidising agent.
Explain your answer.
What element is being Reduced?
N+5
H+1
O-2
S-2
A drop of solution S turns acidified potassium dichromate(VI) to green chromium(III) ion.
What does solution S behave as?
an acid
an oxidising agent
a reducing agent
neither oxidising nor reducing agent
WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION:
Balance the following ACIDIC reactions using the half-reaction method.
MnO4−(aq) + I− (aq) → Mn2+(aq) + I2(s)
Water is a product of this reaction. What is the coefficient of water in the final balanced equation?
8
5
2
16
A reducing agent ______________________.
decreases in oxidation state
is reduced at the end of a reaction
gains oxygen
accepts electrons
