Free Printable Simple Cell Recap

1.

A Fe/Mg simple cell is set up. Which is the metal with a greater tendency to lose electrons?

a)

Fe

b)

Mg

c)

Both can lose electrons as easily

d)

Both gain instead of losing eletrons

2.

On the diagram, draw 2 arrows to illustrate the flow of electrons. Metal 1 = Mg; metal 2 = Fe

3.

Which of the following will be a suitable strong electrolyte for this simple cell? Check ALL that apply.

a)

Hydrochloric acid

b)

Sulfuric acid

c)

Aqueous sodium chloride

d)

lead(II) chloride

e)

ethanol, $C_2H_5OH$

4.

Which is the correct ionic half-equation for the Mg electrode?

a)

$Mg\left(s\right)\ +\ 2e\ \rightarrow\ Mg^{2+}\left(aq\right)$

b)

$Mg\left(s\right)\ \rightarrow\ Mg^{2+}\left(aq\right)\ +\ 2e$

c)

$Mg^{2+}\left(aq\right)\ +\ 2e\ \rightarrow\ Mg\left(s\right)\$

d)

$Mg^{2+}\left(aq\right)\ \rightarrow\ Mg\left(s\right)\ +\ 2e\$

5.

The ionic half-equation in the previous question, $Mg\left(s\right)\ \rightarrow\ Mg2+\left(aq\right)\ +\ 2e$ shows the process of _______, and this process occurs at the ________.

a)

oxidation, anode

b)

oxidation, cathode

c)

reduction, anode

d)

reduction, cathode

6.

Electrons lost by metal 1 (Mg) end up on the surface of metal 2 (Fe). If the electrolyte was hydrochloric acid, which ion(s) will migrate to the Fe electrode? Check all that apply.

a)

$H^+$

b)

$Cl^-$

c)

$OH^-$

d)

$H_2O$

7.

When the ions come into contact with the electrons on the Fe electrode, which ionic half-equation correctly shows what happens?

a)

$H^+\left(aq\right)\ \rightarrow\ H\left(g\right)\ +\ e$

b)

$2H^+\left(aq\right)\ \rightarrow\ H_2\left(g\right)\ +\ e$

c)

$2H^+\ +\ 2e\ \left(aq\right)\ \rightarrow\ H_2\left(g\right)\$

d)

$H^+\ +\ e\ \left(aq\right)\ \rightarrow\ H_{ }\left(g\right)\$

8.

The ionic half-equation in the previous question, $2H^+\ +\ 2e\ \left(aq\right)\ \rightarrow\ H_2\left(g\right)\$ shows the process of _______, and this process occurs at the ________.

a)

oxidation, anode

b)

oxidation, cathode

c)

reduction, anode

d)

reduction, cathode

9.

How did the chemical reactions above produce electrical energy in a closed circuit? Check all that apply.

a)

The electrons lost by Mg flow in the wire

b)

The electrons lost by Mg flow in the electrolyte

c)

The positive ions in the electrolyte migrate towards the electrons on the surface of the Fe electrode

d)

The positive ions in the electrolyte flow in the wire

10.

Why does the Mg decreases in size? Check all that apply.

a)

It is soluble in water.

b)

It reacts with the hydrochloric acid electrolyte

c)

It is oxidised to $Mg^{2+}\left(aq\right)$

d)

It displaces Fe from its solution

11.

Effervescence of a colourless, odourless gas occurs at Mg (metal 1) as well as Fe (metal 2) electrodes when the electrolyte is hydrochloric acid. Explain the production of this gas at the respective electrodes.

a)

At the Mg electrode, the reaction between Mg and hydrochloric acid produces hydrogen gas

b)

The Mg electrode is oxidised to $Mg^{2+}\left(aq\right)$ and this produces hydrogen gas.

c)

At the Fe electrode, the reaction between Fe and hydrochloric acid produces hydrogen gas

d)

At the Fe electrode, the $H^+$ ions which migrated towards it gained electrons to be reduced to hydrogen gas.

12.

After a long time, what is the identity of the electrolyte?

a)

Hydrochloric acid

b)

Water

c)

Magnesium chloride

d)

Iron(II) chloride

Simple Cell Recap

Total questions: 12

Worksheet time: 9mins

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