Ch. 13 (States of Matter)

True/False. When the molecules of gases are heated, the average kinetic energy of the molecules increases.

• True
• False

True/False. The kinetic-molecular theory assumes that the distance between the particles of a gas is so large that there are no significant attractive or repulsive forces.

• True
• False

True/False. The meniscus in a test tube of water demonstrates the equal effect intermolecular forces have on all particles in a liquid.

• True
• False

Water has an extremely high boiling point compared to other compounds of similar molar mass because of

• hydrogen bonding.
• adhesive forces.
• covalent bonding.
• dispersion forces.

The addition of energy to water molecules will cause them to ____.

• freeze
• change to water vapor
• form a crystal lattice
• move closer together

Which of the following is the general definition of a gas?

• Matter with a fixed volume and a fixed shape.
• Matter with a fixed volume but no fixed shape.
• Matter with no fixed volume and no fixed shape.
• Matter with a fixed shape but no fixed volume.

The measure of the average kinetic energy of the particles in a sample of matter is ______________.

• Temperature
• Speed
• Velocity
• Heat

The diagram below shows how liquid water is transformed into a solid and a vapor. Which of these labels should be placed above each of the arrows in the diagram?

• Energy added over the gray arrow; energy released over the black arrow
• Particle velocity decreased over the gray arrow; particle velocity increased over the black arrow
• Energy released over the gray arrow; energy added over the black arrow
• Density decreased over the gray arrow; density increased over the black arrow

The process of hydrogen bonding involves hydrogen atoms bonding with —

• either oxygen, carbon, or silicon
• either nitrogen, boron, or hydrogen
• either fluorine, oxygen, or nitrogen
• either fluorine, hydrogen, or sodium

At the same ______________, the particles of different gases have the same average kinetic energy.

• Volume
• Pressure
• Density
• Temperature