Chemistry_Exam_1

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Chemistry

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Feb 20, 2024

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QUESTION 1 ‘Which of the following pairs of molecules would interact primarily through dispersion forces? ® Br) with Bry © CHy with H3C-0-H 137 with Brp O NH; with Cly © None of these is correct QUESTION 2 Which of the following pairs of molecules would interact primarily through dipole-dipole interactions? © H,0 and H3C-O-H O H3C-0-Hand Cly O HCl and Fa O HF and Br) O None of these is correct QUESTION 3 Which of the following pairs of molecules would interact primarily through hydrogen bonding interactions? © NH3 and H3C-O-H o Cly and Brp O CHy and H3C-0-CH3 O H3C-Cl and H3C-Br O None of these is correct QUESTION 4 Which of the following pairs of molecules would interact primarily through dispersion forces? O CHy and HHO ® Bryand Ip O H3C-Cl and H3C-Br © Br) and HBr © None of these is correct QUESTION 5 Which of the following would you expect to have the highest boiling point? O Bry @ 1c1 OF, O All are equal O Can't tell from just the formula QUESTION What s the vapor pressure of ethanol at 84.6 °C i its vapor pressure at 45.9 °C is 108 mmHg? (3Hyap = 39.3 kiimole) © 107.8 mmHg © 312 mmHg O 113 mmHg © 2176 mmHg © 5392 mmHg QUESTION 7 What s the vapor pressure of benzene at 75.3 °C if ts vapor pressure at 11.6 °C is 45.1 mmHg? (sHyap = 31.0 klimole) © 503 mmHg © 410 mmHg © 2464 mmHg © 4927 mmHg © 452 mmHg 10 points @ 10 points. m 10 points 10 points m 10poms [ o 10poimts [ 10p0imts [
QUESTION 8 Which of the following describes an amorphous solid? © A solid that lacks regular three-dimensional order of the component molecules © Asolid that does not melt well @ A highly ordered solid O A highly crystalline solid O Acolortul soiid QUESTION 9 Agiven solid s britle hard, and does not conduct electriciy. However, when dissolved in water, this compound's solution conducts electricity very well. What type of solid s if? O A molecular crystal O A metallic crystal O A covalent erystal © An ionic crystal None of the above. A solid that does not conduct electricity in the solid wil not conduct electricity in solution QUESTION 10 Which of the following would form an ionic crystal? O cHy @ csct O cry O Na O Can't tell from just the formula
QUESTION 11 ‘Which of the following would form a metallic crystal? ®ca O H3C-CH3 O co, © Nact O Can't tell from just the formula QUESTION 12 Which of the following would form a molecular crystal? O Fe O H3c-0H © KoH O BaF, O Can't tell from just the formula QUESTION 13 Calculate the molar heat of vaporization (sHyap) for fodine (13) using its molar heat of fusion (AHys = 16.27 kJimole) and molar heat of sublimation (Hgyp = 62.30 ki/mole). © 6230 kT/mole © 3879 KI/mole © 7757 KT/mole © 47.03 KT/mole © 406 kT/mole
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QUESTION 14 ‘Which of the following molecules experiences dipole-dipole interactions and hydrogen bonding interactions in its liquid phase? © 1,0 QUESTION 15 ‘What is the molality of an SOy solution containing 36.5 g of H)SO4 in 250 mL of Hy0? Oo146m O 146m © 149m © 0.00149m Oot4em QUESTION 16 ‘Which of the following compounds would you predict willdissolve well in the organic solvent “foluene” (C7Hg)? O csF O NaF © ceHig O 10 O All of these compounds dissolve in toluene because organic solvents are strong
QUESTION 17 Which of the following statements is correct regarding the solubilty of a solute in a solvent? Anincrease in temperature causes an increase in the solubilty of a solid Solute O An increase in temperature causes a decrease in the solubility of a solid solute. O Changes in temperature generally do NOT affect the solubility of a solute. o Only if the solvent is boiling. o None of these statements is correct. QUESTION 18 Which of the following describes a saturated solution?” A solution that can no longer dissolve more of 2 given solute. © Asolution that can still dissolve more solute. O A solution that was cooled very quickly below its freezing point None of the above.
QUESTION 19 Calculate the percent composition by mass of the solute for a solution that contains 15.20 g of NaBr in 109.6 g of solution. ®139% O 161% O 135% O 122% O 013% QUESTION 20 Whatis the molalty of soluton containing 12.8 g of urea [(NH2)2CO] in 300 miL of water? O 427m © 409m O 126m O 135m ©o071m QUESTION 21 Whatis the molality of a solution of NaCl that is 44 6% by mass in water? ® 138m O o00138m O 0s05m O 02s4m O 805m
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QUESTION 22 How many moles of NaCl are there in the solution above (problem £21)? © 6.02 moles © 0.763 moles © 68 moles © 58.45 moles © 7.63 moles QUESTION 23 ‘The solubiy of CO3 in water at 25 *C and normal pressure is 0.034 mole/L. What would happen to the solubily of this compound at a higher temperature? O Stay the same © Increase O Depends on the ideal gas law © Decrease QUESTION 24 Related to problem #23, what would happen to the solubilty of CO at lower temperature? © Icrease © Decrease O Stay the same O Depends on the ideal gas law
QUESTION 25 What is the change in vapor pressute of a solution of 298 g of glucose (MW = 180.2 g/mole) in 585 mL of water at 30 °C? (At 30 °C, P1 = 31.82 mm¥g). © 282 mmHg © 89.7 mmHg © 196 mmHg © 10.7 mmHg © 152 mmHg QUESTION 26 ‘What is the vapor pressure of the solution in problem #257 © 333 mmHg © 315 mmHg © 29.0 mmHg O 303 mmHg O 303 mmHg QUESTION 27 Whatis the boiling point elevation of a solution that s 651 ethylene glycol (MW = 62.01) in 2,505 g of water? Ky (H20) = 0.52 “C/m) O 101°c O 419°C ®218°C ©779°C © oasec
QUESTION 28 Whatis the molality for the solution in problem #272 O 105m ©s19m © 419x10%m O 186m O 0419m QUESTION 29 Whatis the osmotic pressure of a solution of FeCly? (Given: M = 0.04 M, T=25°C, and i = 3.4) © 033atm © 028atm © 405 atm © 098 atm ©333 QUESTION 30 Diamond is a form of pure carbon in crystalline form. Which of the following describes the type of crystal that diamond forms? O Tonic crystals ® Covalent crystals O Molecular crystals O Metallic erystals © Carbon-based conductors
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QUESTION 31 Calculate the molaity of solution in water that is 3.48 M of a compound (H2CO). The density of the solution is 0.881 g/mL O 223m O 395m O 0395m © 00395 m © s46m QUESTION 32 Calculate the molaity of a solution of sulfuric acid (H2S04) in water that is 43 5% by mass. O 0961m © 0.0861m O s61m © s561m O o495m QUESTION 33 Which of the noncovalen ineractons below s the strongest? O Van der Waals © gipole-dipole interactions O Hydrogen bonding O Dipole-induced dipole interactions
QUESTION 34 Which of the noncovalent interactions below is the weakest? O Van der Waals O London forces O Dispersion forces O None of these is correct © All of these are the same! QUESTION 35 Electrolytes are compounds that in solution are able to conduct electricity. Which of the following solutions would behave as a good conductor of electricity? O CaBr; in benzene (CgHg) ® CaBr) in HyO O CaBr, in hexanes (CgHy4) o CaBr; in chloromethane (H3C-Cl) O CaBr; in CFyCly Question 12 0 out of 10 points. Which of the following would form a molecular crystal? Question 13 0 out of 10 points Calculate the molar heat of vaporization (AHyap) for iodine (I2) using its molar heat of fusion (AHfys = 15.27 kJ/mole) and molar heat of sublimation (AHsyp = 62.30 kJ/mole). Question 18 0 out of 10 points Which of the following describes a "saturated solution?" Question 33 0 out of 10 points ‘Which of the noncovalent interactions below is the strongest? Question 8 0 out of 10 points Which of the following describes an amorphous solid?