electrochemistry

What is the study of the relationship between electrical energy and chemical changes called?

Answer explanation

The study of the relationship between electrical energy and chemical changes is called electrochemistry. It explores how electrical energy can cause chemical reactions and vice versa.

Name the device in which a spontaneous redox reaction generates an electric current.

Answer explanation

The device that generates an electric current through a spontaneous redox reaction is called a Galvanic cell. It converts chemical energy into electrical energy, making it essential in batteries and electrochemical applications.

What kind of cell uses electrical energy to drive a non-spontaneous reaction?

Answer explanation

An electrolytic cell uses electrical energy to drive non-spontaneous reactions, unlike galvanic cells which generate electrical energy from spontaneous reactions.

In electrochemistry, oxidation occurs at which electrode?

Answer explanation

In electrochemistry, oxidation occurs at the anode. This is where electrons are released, making it the site of oxidation reactions.

In electrochemistry, reduction occurs at which electrode?

Answer explanation

In electrochemistry, reduction occurs at the cathode. This is where electrons are gained, making the cathode the site of reduction reactions.

Name the flow of electrons in a circuit from negative to positive.

Answer explanation

The flow of electrons in a circuit is referred to as 'current'. It moves from the negative terminal to the positive terminal, which is the conventional direction of current flow.

Which term describes a substance that conducts electricity by movement of ions?

Answer explanation

An electrolyte is a substance that conducts electricity when dissolved in water or melted, due to the movement of ions. This makes 'electrolyte' the correct term for a substance that conducts electricity through ionic movement.

What term denotes electrodes dipping into solutions that undergo redox reactions?

Answer explanation

The term 'Halfcells' refers to the electrodes that dip into solutions where redox reactions occur. Each halfcell contains a specific electrode and electrolyte, facilitating the transfer of electrons during these reactions.

What instrument can measure the potential difference between two half-cells?

Answer explanation

A voltmeter is the instrument used to measure the potential difference between two half-cells in an electrochemical cell. It provides a direct reading of the voltage, making it the correct choice.

Which path do electrons follow externally: from anode to cathode or cathode to anode?

• Anode

• Cathode

Answer explanation

Electrons flow from the anode to the cathode externally. This is because electrons are negatively charged and are attracted to the positive charge of the anode, making 'Anode' the correct choice.