IGCSE Chem Electrochemistry

Front

What is electroplating?

Back

Electroplating is a process that uses electrical current to reduce dissolved metal cations so that they form a coherent metal coating on an electrode.

Front

What is the role of the anode in electroplating?

Back

The anode is the electrode where oxidation occurs, and it typically consists of the metal that is being deposited onto the cathode.

Front

What is the role of the cathode in electroplating?

Back

The cathode is the electrode where reduction occurs, and it is the surface that receives the metal coating.

Front

What happens to the copper sulfate solution during electroplating?

Back

The copper sulfate solution becomes paler as copper ions are deposited onto the cathode.

Front

What is the effect of increasing voltage in electroplating?

Back

Increasing the voltage can enhance the rate of electroplating, leading to a thicker metal layer on the cathode.

Front

What materials are commonly used for anodes in electrolysis?

Back

Common materials for anodes include graphite and the metal being plated.

Front

What is the electrolyte in electroplating?

Back

The electrolyte is a solution that contains metal ions and facilitates the flow of electric current.

Front

What is the significance of the polarity of electrodes in electroplating?

Back

The polarity determines which electrode will gain mass (cathode) and which will lose mass (anode) during the electroplating process.

Front

What color change indicates copper deposition on an object?

Back

The object turns a reddish-brown color when copper is deposited.

Front

What is the relationship between the size of the anode and the amount of metal deposited?

Back

As the anode dissolves, it provides metal ions to the solution, which are then deposited on the cathode.