50 Asked Interview Questions and Answers (2024)

The Aufbau principle states that electrons fill orbitals in order of increasing energy, starting with the lowest energy level.

Example:

For carbon (C), the electron configuration is 1s² 2s² 2p², following the Aufbau principle.

Activation energy is the minimum energy required for a reaction to occur and for bonds to be broken in the reactants.

Example:

Catalysts lower the activation energy, facilitating reactions.

An element consists of only one type of atom, while a compound consists of two or more different types of atoms chemically bonded.

Example:

Water (H2O) is a compound composed of hydrogen and oxygen.

Entropy is a measure of the disorder or randomness in a system. In thermodynamics, systems tend to move towards higher entropy.

Example:

Melting ice increases entropy as the solid structure becomes more disordered.

The Bohr model describes the atom with electrons orbiting the nucleus in fixed energy levels. Each orbit has a specific energy level.

Example:

In the Bohr model, the electron in the first energy level of hydrogen has the lowest energy.

Chemistry Interview Questions and Answers