Ch. 11 Clickers & Qs - Liquids & Intermolecular Forces

Which compound do you think is more volatile at 25^oC: CCl₄ or CBr₄

A. CBr4 because dispersion forces between its
molecules are greater than in CCl4 .

B. CBr4 because polar forces between its
molecules are smaller than in CCl4 .

C. CCl4 because polar forces between its
molecules are greater than in CBr4 .

D. CCl4 because dispersion forces between its
molecules are smaller than in CBr4

A. CBr4 because dispersion forces between its
molecules are greater than in CCl4 .

In which micture do you expect to find ion-dipole forces: CHO₃H in water or Ca(NO₃)₂ in water?

A. CH3OH in water, because CH3OH is a strong electrolyte and forms ions.

B. Ca(NO3)2 in water, because Ca(NO3)2 is a strong electrolyte and forms ions.

C. CH3OH in water, because CH3OH is a weak electrolyte and forms ions.

D. Ca(NO3)2 in water, because Ca(NO3)2 is a weak electrolyte and forms ions.

B. Ca(NO3)2 in water, because Ca(NO3)2 is a strong electrolyte and forms ions.

List the substances CCl₄, CBr₄, and CH₄ in order of increasing boiling point

A. CH4 < CBr4 < CCl4
B. CCl4 < CH4 < CBr4
C. CH4 < CCl4 < CBr4
D. CBr4 < CCl4 < CH4

C. CH₄ < CCl₄ < CBr₄

How do viscosity and surface tension change as temperature increases & as intermolecular forces of attraction become stronger?

A. Viscosity increases as intermolecular forces increase while surface tension decreases. Both viscosity and surface tension increase with increasing temperature.

B. Viscosity decreases as intermolecular forces increase while surface tension increases. Both viscosity and surface tension increase with decreasing temperature

C. Both viscosity and surface tension increase as intermolecular forces increase and temperature decreases.

D. Both viscosity and surface tension decrease as intermolecular forces increase and temperature increases.

C. Both viscosity and surface tension increase as intermolecular forces increase and temperature decreases.

What is the name of the phase change that occurs when ice left at room temperature changes to liquid water? is this change exothermic or endothermic?

A. Melting (or fusion) and endothermic
B. Melting (or fusion) and exothermic
C. Freezing and endothermic
D. Freezing and exothermic

A. Melting (or fusion) and endothermic

Which force is the strongest intermolecular attractive force?

A. Dipole-Dipole
B. Ion-Dipole
C. London
D. Hydrogen

Ion- Dipole

Which force INCREASES in strength as the molecular weight of the compound INCREASES

A. Dipole-Dipole
B. Ion-Dipole
C. London
D. Hydrogen

London

Isopropol alcohol feels cool to the touch because it has an _____ heat of ______

A. Endothermic, Fusion
B. Exothermic, Fusion
C. Endothermic, Vaporaization
D. Exothermic, Vaporaization

Endothermic, Vaporaization

The highest temperature at which a substance can exist in its LIQUID state is called its

A. Triple Point
B. Critical Point
C. Supercritical Point
D. Vapor

Critical Point

The resistance of a liquid to flow is called

Viscosity

When heat is added to ice at 0^oC, what will happen?

A. Will not change
B. Will decrease in temp
C. Will increase in temp
D. A supercritical fluid will form

Will not change

The highest temp at which a substance can exist in its liquid state is called its ______

A. Triple Point
B. Critical Point
C. Supercritical Point
D. Vapor

Critical Point

The temp & pressure at which all 3 phases exist simultaneosly is called the _____ of a substance

A. Triple Point
B. Critical Point
C. Supercritical Point
D. Vapor

Triple point

Which compound below is not capable of forming hydrogen bonds?

a. CH₄
b. NH₃
c. H₂O
d. HF

a. CH₄

Which compound below has the highest boiling point?
a. H₂O
b. H₂S
c. H₂Se
d. H₂Te

a. H₂O

Which element below has the highest boiling point?
a. Kr
b. F₂
c. Cl₂
d. Br₂

d. Br₂

Which substance below has a greater density in its liquidstate than in its solid state?

a. Iron
b. Glass
c. Water
d. Carbon dioxide

Water

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

a. boiling point
b. freezing point
c. heat of vaporization
d. heat of fusion

c. heat of vaporization

At high altitudes, the boiling point of water is

a. 100 degrees Celsius.
b. greater than 100 degrees Celsius.
c. less than 100 degrees Celsius.
d. equal to its freezing point.

less than 100 degrees Celsius.

Substance X has a boiling point of 150 degrees F and afreezing point of 15 degrees F. The condensation point of X

a. is 150 degrees F.
b. is 15 degrees F.
c. is 165 degrees F.
d. is 135 degrees F.

a. is 150 degrees F.