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CHM-152 > Test 1 > Flashcards

Test 1 Flashcards

1
Q

Which one of the following substances is expected to have the highest boiling point?

  • Br2
  • Cl2
  • F2
  • I2

Why??

A

I2.

I don’t know why; greatest mass?

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2
Q

Which one of the folowing substances will have both dispersion forces and dipole-dipole forces?

  • Br2
  • BCl3
  • SO2
  • H2
  • CO2
A

SO2

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3
Q

Which one of the following substances should exhibit hydrogen bonding in the liquid state?

  • PH3
  • H2
  • H2S
  • CH4
  • NH3

Which elements can have hydrogen bonds?

A

NH3 only F, O, and N can have hydrogen bonds.

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4
Q

The intermolecular forces present in CH3NH2 include which of the folowing?

  1. Dipole-Dipole
  2. Ion-Dipole
  3. Dispersion
  4. Hydrogen Bonding
A

1, 2, and 4.

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5
Q

Given the following liquids and their boiling points, which has the highest vapor pressure at its normal boiling point?

  • Ethanol, bp = 78°C
  • Methanol, bp = 65°C
  • Water, bp = 100°C
  • Benzene, bp = 80°C
A

The vapor pressure of each of the liquids at its normal boiling point would be the same.

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6
Q

Glass is classified as what kind of solid?

A

An amorphous solid.

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7
Q

Each of the following substances is a gas at 25°C and 1 atm. Which one will liequefy most easily when compressed at a constant temperature?

  • F2
  • H2
  • HF
  • SiH4
  • Ar
A

HF due to the hydrogen bonding.

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8
Q

Which one of the following crystallizes in a metallic lattice?

  • SiO2
  • Cs
  • I2
  • CaCl2
  • None of these
A

Cs. Need to look into this more.

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9
Q

Which of one of the following liquids would mae a good solven for iodine, I2?

  • HCL
  • H2O
  • CH3OH
  • NH3
  • CS2
A

CS2

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10
Q

Which response lsits all the following pairs that are miscible liquids?

  1. octane (C8H18) and wtaer
  2. acetic acid (CH3COOH) and water
  3. octane (C8H18) and carbone tetrachloride (CCl4)
A

2 and 3. Need to look into miscible liquids.

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11
Q

In which of the following solvents would you expect KBr to be most soluble?

  • C6H14 (hexane)
  • CCl4 (carbone tetrachloride)
  • CH3CH2OH (ethanol)
  • C6H12 (cyclohexane)
  • C6H6 (benzene)
A

CH3CH2OH (ethanol); KBr is ionic

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12
Q

Which of the following liquids would have the highest viscosity at 25°C?

  • CH3OCH3
  • CH2Cl2
  • C2H5OH
  • CH3Br
  • HOCH2CH2OH
A

HOCH2CH2OH because it has the strongest bonds.

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13
Q

According to Raoult’s Law, which statement is false?

  • The vapor pressure of a solvent over a solution decrease as its mole fraction increases
  • The solubility of a gas increases as the temperature decreases
  • The vapor pressure of a solvent over a solution is less than that of pure solvent
  • The greater the pressure of a gas over a solution the greater its solubility
  • Ionic solute dissociate in solution causing an enhancement of all colligative properties
A

The vapor pressure of a solvent over a solution decrease as its mole fraction increases

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14
Q

Which of the following involves a change in temperature during the phase transition?

  • Condenstaion of water
  • Liquefaction of ammonia
  • Fusion of ethanol
  • All of these
  • None of these
A

None of these

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15
Q

The solubility of gases in water usually increases with what?

A

Decreasing temperature and increasing pressure

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16
Q

Which of the following aqueous solutions has the highest osmotic pressure at 25°C (assume 100% dissociation for all soluble ionic compounds)?

  • 0.15m K3PO4
  • 0.30m NH3NO3
  • 0.20m KI
  • 0.45m C12H22O11
  • 0.25m K2CO3
A

0.25m K2CO3​

17
Q

What happens to the solvent and solutes during osmosis?

A

Pure solvent diffuses thorugh a membrane but solutes do not

18
Q

A solution of chloroform, CHCl3, and acetone, (CH3)2CO, exhibits a negative debation from Raoult’s law. This result implies:

  1. Chloroform-chloroform interactions are stronger than chloroform-acetone interactions
  2. Chloroform-chloroform interactions are weaker than chloroform-acetone interactions
  3. Acetone-acetone interactions are stronger than chloroform-acetone interactions
  4. Acetone-acetone interactions are weaker than chloroform-acetone interactions
  5. Both 2 and 4
  6. Both 1 and 3
A
  1. Both 2 and 4. C
    * Chloroform-chloroform interactions are weaker than chloroform-acetone interactions* and Acetone-acetone interactions are weaker than chloroform-acetone interactions
19
Q

What is the mass percent CH3OH (mw = 32.0 g) of a 0.256 m CH3OH (aq) solution.

***Can be done in head***

A

0.819%

20
Q

What is the osmotic pressure of a 0.25 M solution of sucrose at 37°C?

Requires math.

A

6.4 atm

21
Q

How many grams of water are needed to disolve 27.8 g of ammonium nitrate (mw = 80) in order to prepare a 0.452 m solution?

Requires math

A

769 g

CHM-152 (3 decks)

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