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reversible reactions reach equilibrium, provided they occur in a closed container (closed system) that cannot be influenced by external factors.
molecule where the ratio of atoms is 1 : 3. So the bond angle is 1200, for example BF3
a measure of the amount of substance per unit volume. Unit: mol.dm-3
Niels Bohr put forward the theory that electrons move in certain orbits about the nucleus.
there are not enough electrons to contribute to an ordinary covalent bond.