Question

1) The primary driving force for solution formation is the attractive forces between solute molescules. True or False?

2) In an exothermic chemical reaction energy is released as the reaction proceeds. True or False?

3) Addition of a nonvolatile solute to a solvent produces a solution with a lower vapor pressure, a lower freezing point, and a higher boiling point than that of a pure solvent. True or False?

4) For a liquid phase chemical system at equilibrium, increasing the concentraion of a reactant in the forward direction will always cause the equilibrium to temporarily shift to the right. True or False?

5) In reactions that involve solid reactants, the reaction rate increases as the degreee of subdivision of the solid reactant increase. True or False?

6) A 0.16 M sodium chloride solution and 0.92%(m/v) sodium chloride solution both are isotonic relative to red blood cells. True or False?

Questions from intro Chem class.

Answer 1

1. Ans: True

when a solute is added in the solvent, they form an interaction or hydrogen bond. therefore more attracted they are to each other more easily the solution will form.

2. Ans: True.

exothermic reactions are the chemical reaction in which system gives out heat or energy to the surrounding, therefore increase in temperature.

3. Ans: True.

when a nonvolatile solute is added in the solvent, they break the solvent-solvent molecule interaction and forms solute-solvent interaction. therefore more energy has to be given to the solution to boil it, therefore high boiling point, lower vapor pressure, and lower freezing point.

4. Ans: True.

when a reaction occurs in the liquid system, reactants move freely, therefore when the concentration of reactants is increased, chances of collision also increases. therefore shifting the reaction to the right.

5. Ans: True.

As the degree of subdivision increases, surface area increases thus increase in reaction rate.

6. Ans: True.

Two liquids when having same osmotic pressure are called isotonic solutions. 0.92%(m/v) sodium chloride solution have molarity of 0.16M. when red blood cells are placed in this solution, they neither shrinks nor swells, which shows they both have same osmotic pressure.