Question

Which are examples of equilibria? Which are chemical? Which are physical? How would you know they reached equilibrium?

Vaporization & condensation of water

Conversion of oxygen gas (O₂) to ozone gas (O₃)

Dissolving & crystallizing of sugar

Answer 1

Vaporization & condensation of water --> physcal equilbirium, since water remains as H2O

Conversion of oxygen gas (O2) to ozone gas (O3 --> this is chemical equilbirium, since O2 turns to O3, changeein molecule

Dissolving & crystallizing of sugar --> this is physical, since ions are spred but remain their molecular form

All those are equilbiriums, since rate of production = rate of reactants

reverse = forward

You will know when:

Vaporization & condensation of water --> no mor vapor is present when condensing or no more liquid is seen when vaporizing

Conversion of oxygen gas (O2) to ozone gas (O3) --> O3 has pungent odor, O2 is flammable, so can burn

Dissolving & crystallizing of sugar --> no more solid can be soluble, so it sinks as a solid