Certain chemical reactions can be used as a source of direct electrical current in a device called

A battery

Explanation:

A battery is a device which converts chemical energy into electrical energy . Most batteries operate as chemical cells. It is the redox reactions taking place inside the battery that causes electric current to flow via the terminals of the battery to an external circuit.

There are two main types of batteries, viz;

Rechargeable batteries

Non rechargeable batteries

A rechargeable battery is recharged by passing electric current in the reverse direction through the battery; it can be used multiple times to produce electricity in order to power devices. An example of a rechargeable battery is the Lithium-ion battery used in laptops and cell phones.

A non rechargeable battery will give electricity until the chemicals present it are used up(the chemical reactions producing electrical energy attain equilibrium). An example of a non rechargeable battery is a dry cell.

the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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answer: mercury

explanation: