Chemistry Questions et reponses d'entretien
Question 41. What is the Aufbau principle in electron configuration?
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.
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Question 42. Define activation energy in a chemical reaction.
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.
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Question 43. What is the difference between an element and a compound?
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.
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Question 44. Explain the concept of entropy in thermodynamics.
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.
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Question 45. What is the Bohr model of the atom?
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.
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Les plus utiles selon les utilisateurs :
- What is the difference between an atom and a molecule?
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