Electrolysis involves using electricity to break down electrolytes to form elements. The products of electrolysis can be predicted for a given electrolyte. Copper can be purified using electrolysis.
What kind of substances can form electrolytes?
What is the positive electrode in electrolysis called?
Which of the following is a true statement about the electrolysis of sodium chloride solution?
Hydrogen forms at the positive electrode
Sodium forms at the negative electrode
Chlorine forms at the positive electrode
What is formed at each electrode during the electrolysis of dilute sulfuric acid?
Hydrogen at the positive electrode and oxygen at the negative electrode
Hydrogen at the negative electrode and oxygen at the positive electrode
Hydrogen at the negative electrode and sulfur dioxide at the positive electrode
What can happen to the carbon electrodes during the electrolysis of copper sulfate solution?
The negative electrode loses mass
The negative electrode gains mass
The positive electrode gains mass
Which of these describe a property of the gas formed during the electrolysis of copper sulfate solution using inert electrodes?
The gas relights a glowing splint
The gas pops when lit
The gas turns limewater milky
Which of the following is a true statement about the purification of copper by electrolysis?
The positive electrode is impure copper
The positive electrode is pure copper
The negative electrode is impure copper
Which of these changes occurs during electrolysis?
Negative ions lose electrons at the negative electrode and are oxidised
Negative ions lose electrons at the positive electrode and are oxidised
Negative ions gain electrons at the negative electrode and are oxidised
Which of these statements about reduction is correct?
Reduction involves the loss of electrons
Reduction involves the gain of electrons
Reduction involves a reaction in which oxygen atoms are gained by another atom
Which of these is a correct half equation for the oxidation of copper metal? - Higher
Cu → Cu2+ + e-
Cu2+ + 2e- → Cu
Cu → Cu2+ + 2e-