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Enthalpy change refers to the change in heat pressure given out or taken in by a system when the pressure is constant.

A substance that can accept a proton (H+)

A substance that donates a proton (H+)

The valence electrons of transition metals are found in d-orbitals. When the metal ion forms a complex with ligands the d-orbitals split into two different energy levels, and the gap between these levels ...

These two types of bonding are very similar and so can easily be confused however this question specifically wants the difference between them. Covalent bonding occurs when a pair of nuclei share a pair o...