General Chemistry 1311 Total: 100 pts TAMUK Chemistry Department 201S Fall Exam

Question

General Chemistry 1311 Total: 100 pts TAMUK Chemistry Department 201S Fall Exam 5 (Chiž & CALS) 6 Ideally, the van't Hoff factor, , can be determined by the following equation: 1. Methunol and water are miscible, they because of the formation ef 1. Methanol and moles of particles moles of dissolved solute a. do not mix together, ion-dipole moment bond do not mix together; hydrogen ix together, ion-dipole moment What is the van't Hoff factor for BeCly? a. I mix together, hydrogen bond b. 2 d. 4 c. 3 hibits the Ter example NaCI (1.0 mol) will be dissociated 2. Which of the following substance exhibits most hydrogen booding? a. HF b. NH into Na" (1.0 mol) and Ct (1.0 mol), therefore (+11-2, the van't Hoff factor is 2 for NaCI) 7. Which statement regarding viscosity of liquid is not correct? d. CHa (no hydrogen bond exists) 3. Based on the H0 phase disgram, identify the a. Viscosity increases if the temperature increases since molecules move faster at higher temperature. significance of point (0.01 'C, 0.006 atm) and point (374 "C, 218 atm) a. Melting point and boiling point b. Melting point and critical point molecules have larger viscosity since molecules make more contacting surface Triple point and boiling point d.Triple point and critical point with each other than the spherical ones. c. Viscosity is the resistance of liquid or gas to flow d. Viscosity decreases if the temperature increases. 8. Which substance is expected to have the lowest dispersion forces? a. CzeHe bCoH 9. Predict which solvent will dissolve more of KBr based on the like dissolive like principle, b. HO 4. Which one is not colligative property of solution? a. Vapor pressure lowering b. Osmotic pressure c. Boiling point elevation and freezing point CH,CH CH:OH 10. What is the driving force of osmotic pressure? depression d. Jyndall Efect 5. Which statement is i a. Colloid is the a. Net movement of solvent b. Difference in the atmospheric pressure .Concentration of solution in terms of the embrane semi-permeable to both solute and solvent eous mixture b. Colloid contains particles larger enough to scatter the visible light c. Colloidal particles range from 1 nm tol GColloidal particles do not change speed and direction erratically

Explanation / Answer

2nd paper

1)a)At a constant temperature, the amount of a given gas that dissolves in a given type and volume of liquid is directly proportional to the partial pressure of that gas in equilibrium with that liquid.

b)Solubility of the gas=3.71*10^-2*3.6

=0.13356

c) moles of soda drink = 0.1335*0.45

=0.06

d) molar mass of CO2=44

e)mass of CO2=44*0.06

=2.644 grams

2)a)molar mass of C2H6O2=62'

b)moles of C2H6O2=992.48/62

=16

c)dTb=0.514*(16/4)

=2.066

d)Tb of the solution = 102.066 C

e) dTf=1.86*(16/4)

=7.44

so Tf=-7.44 C

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