IMFs Project - Checkpoint #11 - IMF Test

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IMFs Project - Checkpoint #11 - IMF Test - Due 6/12/20

This is your final assignment of the year and it will count as a test grade.

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1. Which has London dispersion forces as its only intermolecular force?

1 point

CH3Cl

HCl

C6H12NH2

CH4

Clear selection

2. The compounds Br2 and ICl have almost identical molecular weights, yet ICl boils at 97°C and Br2 boils at 59 °C. The best explanation for this is

1 point

ICl is an ionic compound and Br2 is covalent

ICl is a nonpolar molecule and Br2 is polar

Cl has a longer bond than that in Br2 .

ICl is polar and Br2 is nonpolar.

Clear selection

3. Which of the following compounds is the most volatile? (Hint: a substance is said to be volatile if it boils at a low temperature, changing from the liquid to the gas phase.)

0 points

NH3

PH3

AsH3

SbH3

Clear selection

4. With which type of substances do London dispersion forces play the most significant role?

1 point

small polar molecules

large non-polar molecules

metals

network compounds

Clear selection

5. Which one of the following has the lowest boiling point?

0 points

C2F6

C2Br6

C2I6

C2Cl6

Clear selection

6. The amount of energy needed to vaporize 1 mole of liquid is given for the samples below. Which compound has the strongest intermolecular forces?

0 points

C2F6

C2Br6

C2I6

C2Cl6

Clear selection

7. Krypton has a higher melting point than Argon because of its

0 points

greater ionization energy.

permanent dipole moment.

stronger dispersion forces

hydrogen bonding

ionic bonds.

Clear selection

8. Elemental iodine (I2) is a solid at room temperature. What is the major attractive force that exists among different I2 molecules in the solid?

1 point

London dispersion force

dipole-dipole rejections

ionic-dipole interactions

hydrogen bonding

dipole-dipole attractions

Clear selection

9. C12H26 molecules are held together by __________.

1 point

hydrogen bonding

ionic-dipole interactions

dipole-dipole interactions

dispersion forces

Clear selection

10. Which of the following compounds shown in the vapor pressure diagram below has the weakest IMFs?

1 point

Diethyl ether

Ethyl alcohol

Water

Ethylene glycol

Clear selection

11. The intermolecular force(s) responsible for the fact that CH4 has the lowest boiling point in the set CH4, SiH4, GeH4, SnH4 is/are __________.

0 points

hydrogen bonding

London dispersion forces

mainly hydrogen bonding but also dipole-dipole interactions

mainly London-dispersion forces but also dipole-dipole interactions

Clear selection

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

0 points

C2H5OH

CH2Cl2

CH3Br

HOCH2CH2OH

Clear selection

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