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In the diagram below, particles of the substance are moving from the liquid phase to the gas phase at the same rate as they move from the gas phase to the liquid phase. mc003-1.jpg The gas and liquid are at equilibrium. a high vapor pressure. a low vapor pressure. zero vapor pressure.

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Erudite1
The correct option is this: THE GAS AND LIQUID ARE AT EQUILIBRIUM.
A chemical system is said to be in equilibrium if the forward and the backward reactions are equal. At equilibrium, both the reactants and the products are present in concentrations which have no tendency to change with time.
irocktheworld11

The gas and liquid are at equilibrium.