Multiple Choice Questions 1.) The process of dissolving sugar in water is endoth

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Multiple Choice Questions

1.) The process of dissolving sugar in water is endothermic but this is not true for all compounds. Dissolving vinegar (acetic acid) in water, for example, is exothermic. Will increasing the temperature increase the solubility of vinegar in water?

(No / Sometimes / Yes), because increasing the temperature ( shifts the equilibrium towards the products / provides more heat for the reaction to overcome the activation energy / shifts the equilibrium towards the reactants / breaks the chemical bonds in vinegar / makes the molecules move faster) and (does not change, increases / decreases )  the solubility of vinegar in water.

2.) The process of dissolving sugar in water is endothermic but this is not true for all compounds. Dissolving vinegar (acetic acid) in water, for example, is exothermic. Which side of the reaction will heat appear for the dissolution of vinegar into water?

a. Heat does not appear in the reaction

b. product side

c. reactant side

c. both sides

3.) For the rock candy to form, sugar needs to come out of solution slowly to allow crystal formation. Would adding more sugar after the heat is turned off be an effective way to create crystals?

Adding more sugar will shift equilibrium toward ( neither reactant or product / aqueous sugar / both reactant and product / solid sugar ). This would ( leave undissolved suager crystals / occur slowly / occur quickly / supersaturate the solution ), so the rock candy ( will / will not ) crystalize well.

Explanation / Answer

This reaction is exothermic means energy releases so the value of values of is negative.

According to LeChatellier's law ,increasing temperature favors endothermic reaction. as dissolving sugar is exothermic, it will not be favored.

Solubility will decrease with increasing temperature

Le Chatelier’s Principle:

According to this principle, whenever an equilibrium system is subjected to change, certain processes takes place which have a tendency to partially neutralize the initial change, which result in bringing the system to a new position of equilibrium. This principle mainly explains three different equilibrium changes:

Equilibrium change due to change in the temperature:

According to Le Chatelier’s Principle if heat is removed in a system than the equilibrium will shift towards heat producing direction and if heat is absorbed than the equilibrium will shift towards heat removing direction.

2) Heat is released in the dissolution of vinegar in water. Therefore, heat is lost from the product side. Hence, heat must appear on the reactant side.

(3) the correct answer is Reactant side

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