Voltaic Cell SR2

In the voltaic cells, which pair of metals below will produce the largest cell voltage?

• zinc/copper

• copper/silver

• aluminium/silver

• magnesium/iron

Which of the following is the similarity between an electrolytic cell and a voltaic cell?

• Converts electrical energy to chemical energy

• Flow of electrons from negative terminal to positive terminal

• Anode is negatively charged while cathode is positively charged

• Carbon or platinum can be used as electrodes

When magnesium metal and copper metal are connected by wire and then immersed in copper(II) sulphate solution, which of the following does not happen?

• Electron flows from copper metal to magnesium metal

• Mass of copper increases

• Mass of magnesium decreases

• The colour intensity of blue copper(II) sulphate solution decreases

Below is the half-equation of a reaction

2Cl^-(aq) --> Cl₂(g) + 2e^-

What is represented by the equation?

• Electrons are received by chlorine

• Electrons are donated by chlorine

• Electrons are received by chloride ions

• Electrons are donated by chloride ions

Figure shows a chemical cell. What is the energy conversion that occurs in the cell?

• chemical energy --> kinetic energy

• chemical energy --> electrical energy

• electrical energy --> chemical energy

• electrical energy --> potential energy

The diagram shows the set-up of the apparatus of a chemical cell. Which of the following occurs in the chemical cell?

• The magnesium rod becomes thicker

• The iron rod becomes thinner

• Electrons flow from iron to magnesium

• the green colour of iron(II) sulphate becomes paler

The diagram shows a chemical cell. Which half-equation represents the reaction at the positive terminal of the chemical cell?

• Mg --> Mg²⁺ + 2e^-

• Zn²⁺ + 2e^- --> Zn

• 2H⁺ + 2e^- --> H₂

• 2Cl^- --> Cl₂ + 2e^-

The diagram shows the apparatus set-up for a simple cell after the experiment is carried out for one hour. Based on the diagram, which statement is correct?

• Metal P is the cathode

• Metal P is the positive terminal

• Metal Q releases electrons

• P can displace Q from its salt solution

The table shows the results of three voltaic cells made up of different pairs of metals. Which of the following is the order of the metals arranged in a decreasing tendency to release electrons?

• Z, X, Y

• Z, Y, X

• X, Y, Z

• X, Z, Y

The table below shows information about four voltaic cells. What is the potential difference of the voltaic cell produced when metal Q is paired with metal T?

• 0.8 V

• 1.4 V

• 1.9 V

• 3.5 V