15. What will the freezing point (in question 14) do when lots of salt is dissol

Question

15. What will the freezing point (in question 14) do when lots of salt is dissolved in the water a. increase b. decrease c. stay the same 16. The volume of a gas is directly proportional with the temperature in Kelvin. This is whose law? A. Gay Lussac B. Boyle C. Charles 17. (Ideal Gas Law) The following volume-temperature plots were made at different constant pressures (and constant number of moles of gas). Which plot represents the higher pressure? a. A 18. The following figure represents soap. Nat Which end of the anion is hydrophobic? a. left end b. right end 19. What is the expected freezing point of a solution that contains 25.0g of glucose, CH1:0%, in 100 g of water? Kr= 1.86 °C m-1 A. 293 B. 4.89 C-259 D. 36.0 C 20. The units of heat capacity are

Explanation / Answer

15. b) decrease (Freezing point depression is a colligative property. When a solute is added to a solvent its freezing point decreases.)

16. c) Charles's law (According to Charles's law, volume is directly proportional to absolute temperature of the gas)

17. a) A (PV=nRT so V = nRT/P. Greater the pressure, smaller will be the slope. A has lesser slope than B. So A has high pressure.)

18. a) left end (non-polar end is called hydrophobic end since it repels water)

19. moles of glucose = 25g/180 g. mol-1 = 0.14

molality = 0.14 mol/ 0.1 kg = 1.4 m

T (water) - T (solution) = Kf x 1.4 m = 1.86 oC m-1 x 1.4 m = 2.6 oC

0 oC - T(Solution) = 2.6 oC .

T (Solution) = -2.6 oC. Option C) -2,59 oC.

20. c) J/g . K or J/g. oC

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