10.1 Galvanic Cell - A

Which energy conversion shown below takes place in a galvanic cell?

• Electrical to chemical

• Mechanical to chemical

• Mechanical to electrical

• Chemical to electrical

Answer explanation

Chemical reactions in the electrolyte generate electric current. This can be observed from the deflection of voltmeter needle

In a voltaic cell, the salt bridge is necessary for

• the movement of electrons to create a current

• the movement of ions to create a current

• the movement of electrons and maintain the electrical neutrality of solution

• the movement of ions and maintain the electrical neutrality of solution

Answer explanation

Salt bridge is made of a U-tube containing an electrolyte like sodium nitrate, potassium chloride or ammonium chloride.

In a Galvanic Cell, the anode is the _________ terminal.

Oxidation occurs at the...

• anode

• cathode

In the above Galvanic Cell, which half cell is undergoing reduction?

• Cu | Cu²⁺

• Zn | Zn²⁺

Answer explanation

Copper is the less electropositive metal compared to Zinc. Thus, Reduction take place whereby Cu²⁺ ions are converted to Cu

In a redox reaction, the reducing agent... (choose two options)

• is oxidised

• is reduced

• increases its oxidation number

• decreases its oxidation number

If an electrochemical reaction is spontaneous, what will E_cell be?

• positive

• negative

What is the standard electrode which all other standard electrode potentials are measured against?

• helium

• hydrogen

• magnesium

• potassium

E_cell = E_cathode - E_anode. Is this equation true or false?

• True

• False

Answer explanation

Kakak tolak adik. Remember ya :)

If the cell potential, E_cell is negative, the reaction is?

• a success

• spontaneous

• not spontaneous

• exothermic