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This quiz focuses on reaction classification, and redox reactions including balancing redox reactions, galvanic cells, and energy diagrams.
Lithium metal is placed in water and the dissolution of the lithium and evolution of a gas is observed. Which of the following describes the reaction?
Lithium is reduced and water is oxidized
Lithium is oxidized and water is reduced
Lithium hydroxide is oxidized and hydrogen is reduced.
Lithium is oxidized and oxygen is reduced
Consider the following unbalanced redox reaction between permanganate and iodide:
H+ + MnO4- + I- → I2 + Mn2+ + H2O
When the equation is balanced, what is the coefficient for the iodine produced by the reaction?
3
5
10
6
Consider the following unbalanced redox reaction between permanganate and iodide:
H+ + MnO4- + I- → I2 + Mn2+ + H2O
When the equation is balanced, what is the coefficient for the iodine produced by the reaction?
0
2
3
5
A 25.00 mL sample of a solution of iron(II) sulfate is titrated with a 0.0968 mol/L solution of potassium permanganate. 7.75 mL of the permanganate solution is required to reach the equivalence point. What is the concentration of the iron(II) sulfate solution? The balanced redox equation is:
MnO4- + 5Fe2++ 8H+ → Mn2+ + 5Fe3+ + 4H2O
0.45 mol/L
0.75 mol/L
0.15 mol/L
0.35 mol/L
Classify the following reaction:
AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq)
Redox
Synthesis
Decomposition
Precipitation
The formation of metallic oxides involves the transfer of electrons from metal atoms to oxygen atoms. In the formation of one mole of which metallic oxide do the metal atoms not transfer exactly 2 moles of electrons?
Magnesium oxide
Sodium oxide
Aluminum oxide
Iron (III) oxide
An old commercial process for aluminium extraction used large quantities of sodium to convert aluminium ions into aluminium atoms. The modern aluminium extraction process uses electrolysis. Which statements are correct? In the old process:
1 The sodium acted as an oxidising agent.
2 The reaction worked because sodium is more reactive than aluminium.
In the modern process:
3 The equation for the cathode reaction is Al3+(l) + 3e– → Al(l).
4 The carbon anode needs replacing often because it is oxidised to carbon dioxide by the oxygen evolved.
A
B
C
D
Four processes using electrolysis are listed.
1 the electrolysis of concentrated aqueous sodium chloride 2 the electrolysis of dilute sulfuric acid
3 the extraction of aluminum from pure aluminum oxide
4 the purification of copper using aqueous copper(II) sulfate Which processes produce oxygen at one of the electrodes?
1 and 2
2 and 3
3 and 4
2 and 4
