Question

1. what causes the dipole arrow become larger as shown in the pictures below?

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Explanation:

Dipole arrows represent the direction of electron - density shift in a bond. A larger dipole arrow indicates a greater difference in electronegativity. Electronegativity (\(EN\)) is the ability of an atom to attract electrons in a chemical bond. If atom B has a higher electronegativity than atom A, it will pull the bonding electrons more strongly towards itself. This creates a larger separation of charge (a more polar bond), which is visually represented by a larger dipole arrow pointing towards the more electronegative atom (atom B in this case).

Answer:

The higher electronegativity of atom B.