Free Practice Quiz Question List

05/14 Intermolecular Forces and Phases of Matter Online Quiz Questions

Use this free practice quiz with 20 questions to review 05/14 Intermolecular Forces and Phases of Matter, test your knowledge, and prepare for your next test or exam.

20 questions

Choose one

1 point

A sample keeps a definite volume but takes the shape of whatever container holds it. Which state of matter best describes the sample?

A
A gas, because its particles move independently
B
A liquid, because it has a definite volume but no definite shape
C
A solid, because its particles are closely packed
D
A plasma, because its particles are highly energetic

True or false

1 point

True or false: During an ordinary phase change, the covalent bonds within each molecule are generally broken.

A
True
B
False

Fill in the blank

1 point

At the same temperature, a liquid with stronger intermolecular attractions generally has vapor pressure.

Written response

1 point

What phenomenon causes water to rise in a narrow, clean glass tube when adhesion to the glass helps draw the liquid upward?

Choose one

1 point

Two isomers have the same molecular formula and similar polarity. Which isomer will generally have stronger London dispersion attractions and a higher boiling point?

A
The more-branched isomer, because branching always increases contact area
B
The less-branched isomer, because it usually has a larger contact area
C
Both must have identical boiling points because their formulas are the same
D
The more-branched isomer, because compact molecules always have more electrons

Choose all

1 point

Select all of the phase changes that are endothermic.

A
Melting
B
Vaporization
C
Sublimation
D
Freezing
E
Condensation
F
Deposition

True or false

1 point

True or false: On a heating-curve plateau, added heat primarily increases intermolecular potential energy while the average kinetic energy remains constant.

A
True
B
False

Written response

1 point

How much heat is absorbed when 3.00 mol of ice melts at its melting point? Use $(\Delta H_{\mathrm{fus}}=6.01\ \mathrm{kJ\ mol^{-1}})$ and report the value in kJ.

Choose one

1 point

Which condition defines the boiling point of a liquid at a particular external pressure?

A
When the liquid has no intermolecular attractions remaining
B
When the liquid reaches exactly 100 °C under every condition
C
When the liquid's vapor pressure equals the external pressure
D
When all molecules in the liquid have the same kinetic energy

Choose all

1 point

Select all properties that are characteristic of ionic solids.

A
They typically have high melting points.
B
They are generally brittle.
C
They conduct electricity when molten or dissolved.
D
They are typically malleable and ductile as solids.
E
They are usually good electrical conductors as solid crystals.

Fill in the blank

1 point

Hydrogen bonding can occur when hydrogen is covalently bonded to .

Open ended

1 point

Explain why water's solid–liquid boundary slopes slightly to the left on a phase diagram. Relate the unusual slope to the densities of ice and liquid water and to the effect of increasing pressure.

True or false

1 point

True or false: Because ice is less dense than liquid water, increasing pressure can favor melting under appropriate conditions.

A
True
B
False

Choose one

1 point

On a phase diagram, what point marks the end of the liquid–gas boundary, beyond which no amount of pressure can produce an ordinary liquid above the critical temperature?

A
The triple point
B
The critical point
C
The normal boiling point
D
The melting point

Choose one

1 point

A sample has a definite volume, takes the shape of its container, and consists of particles that remain close together while moving past one another. Which state of matter best describes the sample?

A
The particles are widely separated and the substance has neither a definite shape nor a definite volume.
B
The particles remain close together but can move past one another, so the substance has a definite volume but no definite shape.
C
The particles vibrate about fixed positions, so the substance has a definite shape and volume.
D
The particles are completely stationary and occupy no volume.

Choose one

1 point

Which intermolecular force must be present between two nonpolar molecules?

A
Only hydrogen bonding
B
Only dipole–dipole attraction
C
London dispersion forces
D
Ion–dipole attraction

Choose one

1 point

Why do small droplets of a liquid tend to be approximately spherical?

A
Surface molecules experience a net inward attraction that favors a smaller surface area.
B
Surface molecules have no intermolecular attractions and therefore spread indefinitely.
C
Surface molecules are held in place by covalent bonds to the air.
D
Surface molecules move faster than all molecules inside the liquid.

Choose one

1 point

A solid is brittle, has a high melting point, and conducts electricity when molten but not as a solid. Which type of solid is it most likely to be?

A
Molecular solid
B
Metallic solid
C
Network covalent solid
D
Ionic solid

Written response

1 point

How much energy is required to vaporize 2.00 mol of water at its boiling point if ΔH_vap = 40.7 kJ/mol? Enter the value in kJ. Use zero absolute tolerance.

Written response

1 point

A 250.0 g sample of water is warmed from 20.0 °C to 35.0 °C. What amount of heat is absorbed? Use $c=4.18\ \mathrm{J\ g^{-1}\ ^\circ C^{-1}}$ . Enter your answer in kJ. Answers within 0.1 kJ of the reference value are accepted.