For a single substance at atmosphericpressure, classify the following as describing a spontaneousprocess, a nonspontaneous process, or an equilibrium system.1. solid melting above its melting point2.liquid freezing below its freezing point3. gas condensing above its condensation point4. liquid vaporizing below its boiling point5. solid melting below its melting point6. solid and liquid together at the melting point with no netfreezing or melting7. gas condensing below its condensation point8. liquid and gas together at the boiling point with no netcondensation or vaporization9. liquid freezing above its freezing point10. liquid vaporizing above its boiling point

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answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.