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Chemistry Fall 24' > Chem Exam 2 > Flashcards

Chem Exam 2 Flashcards

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1
Q

Rank the following in order of increasing strength of intermolecular forces.
* hydrogen bonding
* dipole-dipole
* van der Waals
* ion-ion
* ion-dipole

A
  • van der Waals
  • dipole-dipole
  • hydrogen bonding
  • ion-dipole
  • ion-ion
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2
Q

Which of the following statements about intermolecular forces is incorrect.
* Intermolecular forces are due to the proximity of atoms or molecules in space.
* Intermolecular forces are stronger than intramolecular forces.
* The strength of intermolecular forces depends on the magnitude of any real or partial charges that may or may not be present.
* Intermolecular forces are attractive forces that occur between two or atoms of molecules.

A
  • Intermolecular forces are stronger than intramolecular forces.
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2
Q

Which of the following statements is true about hydrogen bonds.
* Hydrogen bond donors donate electron density.
* Hydrogen bond donors are the species with the hydrogen.
* Hydrogen bond acceptor receives the electron density.
* Hydrogen bond acceptors are the species with the hydrogen.

A
  • Hydrogen bond donors are the species with the hydrogen.
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3
Q

Which of the following would have van der Waals forces as their strongest intermolecular force?
* Propane (CH3CH2CH3)
* Ethanol (CH3CH2OH)
* Water (H2O)
* Ammonia (NH3)

A
  • Propane (CH3CH2CH3)
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4
Q

The molecular weight of potassium dichromate (K2Cr2O7) is ________ g/mol.
* 107.09
* 242.18
* 294.18
* 294.18
* 255.08

A
  • 294.18
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4
Q

A molecule can undergo hydrogen bonding if it contains hydrogen covalently bonded to
* chlorine, fluorine, or iodine
* sulfur, oxygen, or fluorine
* fluroine, bromine, or iodine
* fluorine, oxygen, or nitrogen
* nitrogen, fluorine, oxygen, or chlorine

A
  • fluorine, oxygen, or nitrogen
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5
Q

Which intermolecular forces affect the ability of a solvent to dissolve the solute?
* Solute-Solute intermolecular forces
* Solvent-Solvent intermolecular forces
* Solute-Solvent intermolecular forces
* All of the above

A
  • All of the above
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6
Q

In a saturated solution of a salt in water, ________.
* the rate of crystallization = the rate of dissolution
* seed crystal addition may cause massive crystallization
* the rate of crystallization = the rate of dissolution
* the rate of crystallization > the rate of dissolution
* addition of more water causes massive crystallization
* the rate of dissolution > the rate of crystallization

A
  • the rate of crystallization = the rate of dissolution
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6
Q

Which one of the following is a correct expression for molarity?
* mol solute/mL solvent
* µmol solute/L solution
* mol solute/L solvent
* Correct answer:
* mmol solute/mL solution
* mol solute/kg solven

A
  • mmol solute/mL solution
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7
Q

Determine the molarity of a solution formed by dissolving 468 mg of MgI2 in enough water to yield 100.0 mL of solution.

  • 0.337 M M
  • 0.0337 M
  • 0.0168 M
  • 0.168 M
  • 1.68 M
  • 16.8 M
A
  • 0.0168 M
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8
Q

What is the mass percent of a caffeine solution made by dissolving 435 mg of caffeine, C8H10N4O2, in 75 g of benzene, C6H6?
* 5.8%
* 0.055%
* 0.58%
* 0.058%
* 5.5%

A
  • 0.58%
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9
Q

What is the concentration of a solution prepared by dissolving 19.17 g NaOH (density = 2.13 g/mL) in 491 mL of water? (Report your answer to two decimal places. No units are required).

A

0.96

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9
Q

A standard 1.00 L saline IV bag contains 0.9 % (w/w) NaCl. Calculate the molarity of this 1.00 L solution.

  • 0.00015 M
  • 0.15 M
  • 0.015 M
  • 1.5 M
A
  • 0.15 M
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10
Q

A 5 mL dose of children’s tylenol contains 160 mg of acetaminophen (density = 1.26 g/mL). What is the volume percent for this dose?
* 3.9 %
* 3.2 %
* 2.5 %
* 25.2 %

A
  • 2.5 %
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11
Q

What is the maximum amount a 0.5 % (w/w) midazolam soution that can be adminstered to induce anesthesia in a 165 lb patient?
1 kg = 2.205 lbs
Maximum midazolam dose is 0.35 mg/kg

  • 52.4 mL
  • 11.55 mL
  • 5.24 mL
  • 25.47 mL
  • 14.96 mL
A
  • 5.24 mL
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12
Q

What is the temperature in Kelvin at STP? (Report your answer without decimal places. No units required)

A

273

12
Q

Commercial grade HCl solutions are typically 39.0% (by mass) HCl in water. Determine the molarity of the HCl, if the solution has a density of 1.20 g/mL.
* 7.79 M
* 10.7 M
* 9.35 M
* 12.8 M
* 13.9 M

A
  • 12.8 M
13
Q

How many grams of KBr are contained within 60.0 mL of 0.15 M KBr? (Report your answer to two decimal places. No units are required)

A

1.07

14
Q

How much water is required to prepare a 0.25 M solution of FeSO4 that contains 5.00 g of FeSO4 (density = 2.84 g/mL) (Report your answer to two decimal places. No units are required).

A

129.50 to 130.40 inclusive

14
Q

A solution (density = 1.03 g/mL) is 2.5 % KOH in water. How many grams of KOH are contained within 35.0 mL of this solution? (Report your answer to two decimal places. No units required)

A

0.85 to 0.95 inclusive

15
Q

What is the pressure in atmospheres at STP? (Report your answer to two decimal places. No units required)

A

1

16
Q

What is the molar volume of a gas at STP? (Report your answer to one decimal places. No units required)

A

22.4

16
Q

A gas in a 250 mL piston experiences a change in pressure from 760 mmHg to 845 mmHg. What is the new volume of the gas in the piston. (1 atm - 760 mmHg) (Report your answer without decimal places. No units are required)

A

225

17
Q

The volume of a balloon filled with H2 at 275 torr is compressed from 6.40 L to 3.20 L. What is the final pressure of the balloon? (1 atm = 760 torr) (Report your answer without decimal places. No units are required)

A

550

18
Q

2.50 L of N2 gas at 0 oC is heated to 32 oC. What is the new volume of the gas? (Report your answer to two decimal places. No units are required)

A

Correct answer:
2.79

19
Q

200 mL of O2 at 23 oC is heated an additional 50 oC. What is the volume of the gas after warming? (Report you answer to two decimal places. No units are required)

A

Correct answer:
233.78

20
Q

He gas at 32 oC and 1.25 atm is cooled to -40 oC. What is the new pressure of the He gas? (Report your answer to two decimal places. No units are required)

A

Correct answer:
0.95

20
Q

A car tire is inflated to 32 psi on 5.5 oC day. If the overnight temperature drops 15 oC, what is the new tire pressure in psi? (1 atm - 14.7 psi) (Report your answer to one decimal places. No units are required)

A

Correct answer:
30.28

21
Q

150 g of O2 has a volume of 105 L at STP. If 31 g of oxygen are removed, what is the new volume of the gas? (Report your answer to one decimal place. No units are required)

A

Correct answer:
83.3

22
Q

A balloon is filled to 25 L with 5.0 g of He. Determine how many grams of He were added if the volume of the balloon increases 5 L. (Report your answer to one decimal place. No units are required)

A

Correct Answer:
1.0

23
Q

Nitrox is a gas mixture of N2 and O2 that is 68 % N2 (w/w). What is the partial pressure (in atm) of the oxygen if the tank is pressurized 3000 psi? (1 atm = 14.7 psi) (Report your answer to one decimal place. No units are required)

A

Correct Answer:
59.0 to 60.2 inclusive

23
Q

A 5.00 L chamber contains 1.50 g H2, 12.3 g CH4, and 6.00 g O2 at 27C. What is the total pressure of the mixture? (R = 0.08206 (L x atm)/(K x mol)) (Report your answer to two decimal places. No units are required)

A

Correct answer:
8.26

24
Q

A 5.00 L chamber contains 1.50 g H2, 12.3 g CH4, and 6.00 g O2 at 27 oC. What is the partial pressure of H2 in the mixture? (R = 0.08206 (L x atm)/(K x mol)) (Report your answer to two decimal places. No units are required)

A

Correct Answer:
3.60 to 4.00 inclusive

25
Q

A 5.00 L chamber contains 1.50 g H2, 12.3 g CH4, and 6.00 g O2 at 27 oC. What is the partial pressure of O2 in the mixture? (R = 0.08206 (L x atm)/(K x mol)) (Report your answer to two decimal places. No units are required)

A

Correct Answer:
0.87 to 0.97 inclusive

26
Q

A 5.00 L chamber contains 1.50 g H2, 12.3 g CH4, and 6.00 g O2 at 27 oC. What is the partial pressure of CH4 in the mixture? (R = 0.08206 (L x atm)/(K x mol)) (Report your answer to two decimal places. No units are required)

A

Correct Answer:
3.72 to 3.82 inclusive

27
Q

A cylinder (empty weight = 4.5 kg) containing N2O weighs 5.0 kg. What is the volume in L of N2O at 23 oC? (Report your answer without decimal places. No units are required)

A

Correct Answer:
274 to 276 inclusive

Chemistry Fall 24' (8 decks)

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