(Question and Answer): What best explains why dissolving a gas in water is always exothermic? A) There are no

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always exothermic? 21. What best explains why dissolving a gas in water is A) There are no solute-solute interactions to break up B) There are no solvent-solvent interactions to break up C) The resulting solute-solvent interactions are D) The solubility of gases in water is higher in temperature E) Water is a polar solvent especially powerful 22 Given the solubility graph below determine which statement is 240 200 」160 8120 80 兰40 O 0 20 40 60 80 100 Temperature OC A) Both substance X and Y represent gaseous substances. B) Substance Y is more soluble for a given temperature and quantity of solvent than substance X. C) Substance Y is unsaturated at 30 g/100mL water and a temperature of 100 °C. D) At 0 ℃ substance X is more soluble than substance Y E) An increase in pressure would cause an increase in solubility for both substance X and Y 23. Which of the following properties are not considered to be colligative properties? A) Vapor-pressure lowering B) Boiling-point elevation C) Freezing-point depression D) Osmotic pressure E) All of these represent colligative properties 24. Solubility and miscibility are different in that miscibility has no limits to the quantity of solute and solvent that can be made into a homogeneous mixture whereas solubility does A) True B) False

What best explains why dissolving a gas in water is always exothermic? A) There are no solute-solute interactions to break up B) There are no solvent-solvent interactions to break up C) The resulting solute-solvent interactions are especially powerful D) The solubility of gases in water is higher in temperature E) Water is a polar solvent Given the solubility graph below determine which statement is correct. A) Both substance X and Y represent gaseous substances. B) Substance Y is more soluble for a given temperature and quantity of solvent than substance X. C) Substance Y is unsaturated at 30 g/100mL water and a temperature of 100 degree C. D) At 0 degree C substance X is more soluble than substance Y. E) An increase in pressure would cause an increase in solubility for both substance X and Y. Which of the following properties are not considered to be colligative properties? A) Vapor-pressure lowering B) Boiling-point elevation C) Freezing-point depression D)

Expert Answer

Answer

21, option C i.e. solute – solvent interactions are powerful as the new interactions formed are strong hence enthalpy change is negative thus, dissolving of gas in water is exothermic

22, option E – an increase in pressure would increase in solubility of both substances X and Y

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23, option E is correct

24, statement is true

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