According to sigmund freud, which part of the mind is composed of biological drives and consequently is the source of psychic energy

The Id.

Explanation:

According to Freud, Id is the part of the mind that is composed of biological impulses that contains our basic psychic energy, or libido, and is expressed through stress reduction. Thus we act in an attempt to reduce this tension to a more tolerable level. To meet the needs and maintain a comfortable level of tension, it is necessary to interact with the real world. For example, hungry people should go in search of food if they want to release hunger-induced tension. Therefore, it is necessary to establish some sort of proper link between the demands of id and reality.

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explanation:

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hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds