1. Which force below is the strongest intermolecular attractive force? a. Hydrog

Question

1. Which force below is the strongest intermolecular attractive force?

a.   Hydrogen bonding

b.   Ion-dipole forces

c.   Dipole-dipole forces

d.   London dispersion forces

2. Which force below increases in strength as the molecular weight of the compound increases?

a.Hydrogen bonding

b.Ion-dipole forces

c.Dipole-dipole forces

d.   London dispersion forces

3. Which compound below is not capable of forming hydrogen bonds?

a.CH4

b.NH3

c.H2O

d.   HF

4. Which compound below has the highest boiling point?

a.H2O

b.H2S

c.H2Se

d.   H2Te

5. Which element below has the highest boiling point?

a.Kr

b.F2

c.Cl2

d.   Br2

6. Which substance below has a greater density in its liquid state than in its solid state?

Iron

Glass

Water

d.   Carbon dioxide

7. The resistance of a liquid to flow is called the _______ of the liquid.

density

viscosity

potential energy

d.   flow rate

8. The energy required to cause a liquid to boil is called the _______ of the liquid.

boiling point

freezing point

heat of vaporization

d.   heat of fusion

9. Isopropyl alcohol feels cool to the touch because it has an (X) heat of (Y).

a. X = exothermic,   Y = vaporization

X = endothermic,   Y = vaporization

X = exothermic,   Y = fusion

X = endothermic,   Y = fusion

10. When heat is added to ice at zero degrees Celsius, what will happen?

The temperature will increase.

The temperature will decrease.

The temperature will not change.

A supercritical fluid will form.

11. The highest temperature at which a substance can exist in its liquid state is called its _______ point.

boiling

freezing

triple

d.   critical

12. The temperature and pressure at which all three phases exist simultaneously is called the _______ point of a substance.

boiling

freezing

triple

d.   critical

13. At high altitudes, the boiling point of water is _______.

100 degrees Celsius.

b. greater than 100 degrees Celsius.

less than 100 degrees Celsius.

equal to its freezing point.

14. Substance X has a boiling point of 150 degrees F and a freezing point of 15 degrees F. The condensation point of X _______.

is 150 degrees F.

is 15 degrees F.

is 165 degrees F.

d.   is 135 degrees F.

15. Bonus: Which of the terms below does NOT describe a type of liquid crystal?

Eutectic

Nematic

Smectic

d.   Cholesteric

Explanation / Answer

Question 1.

strongest is

b.   Ion-dipole forces > since the charge of the ION is set, i.e. it is electrostatic force already, for the dipole, it will be strong enough to interact as + / - bond

Question 2

d.   London dispersion force will increase as mass of the species increases, since it is based directly proportional to the amount of protons/electrons in the species

Question 3.

Note that all can form H-bonds since they are part of the group of H-bonding, N,O,F

for C, there is no option for H-bonds so

a.CH4 will not form a bond

Q4.

Must be Water, since it will not only form dipole-dipole interactions as all others, but it will also form hydrogen bonding, which aids in the increase of boiling point

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