1) Explain why ice floats in water.
- A) Ice is more dense than water.
- B) Steam is less dense than water.
- C) Ice is less dense than water.
- D) Steam is more dense than water.
- E) Ice is the same density as water.
2) Identify the state of matter that is the most compressible.
- A) gas
- B) solid
- C) liquid
- D) All are compressible.
- E) None is compressible.
3) Identify the characteristics of a liquid.
- A) indefinite shape and volume
- B) indefinite shape, but definite volume
- C) definite shape and volume
- D) none of the above
- E) all of the above
4) Identify the characteristics of a gas.
- A) indefinite shape and volume
- B) indefinite shape, but definite volume
- C) definite shape and volume
- D) none of the above
- E) all of the above
5) Which one of the following has a definite shape and volume?
- A) gas
- B) liquid
- C) solid
- D) none of the above
- E) all of the above
6) Which one of the following has a low density?
- A) gas
- B) liquid
- C) solid
- D) none of the above
- E) all of the above
7) Give the change in condition to go from a liquid to a gas.
- A) increase heat or reduce pressure
- B) increase heat or increase pressure
- C) cool or reduce pressure
- D) cool or increase pressure
- E) none of the above
8) The forces between polar molecules are known as
- A) hydrogen bonding.
- B) ion-dipole forces.
- C) dipole-dipole forces.
- D) dispersion forces.
- E) ionic forces.
9) A molecule contains hydrogen bonding if it contains hydrogen covalently bonded to
- A) fluorine, oxygen, or nitrogen.
- B) chlorine, carbon, or iodine.
- C) sulfur, sodium, or fluorine.
- D) oxygen, nitrogen or carbon
10) Which of the following statements is TRUE?
- A) Intermolecular forces are generally stronger than bonding forces.
- B) The potential energy of molecules decreases as they get closer to one another.
- C) Energy is given off when the attraction between two molecules is broken.
- D) Increasing the pressure on a solid usually causes it to become a liquid.
- E) None of the above is true.
11) Place the following compounds in order of decreasing strength of intermolecular forces.
- CH3CH2CH2CH2CH2CH3 II. (CH3)3CCH3 III. (CH3)3CCH2CH3
- A) III > II > I
- B) I > III > II
- C) I > II > III
- D) II > III > I
- E) III > I > II
12) Identify the compound with the lowest boiling point.
- A) CH3OCH3
- B) CH3CH2CH3
- C) CH3CHO
- D) (CH3)2O
- E) CH3CN
13) The two strands in DNA are held together by
- A) dispersion forces.
- B) dipole-dipole forces.
- C) hydrogen bonding.
- D) ion-dipole forces.
- E) ionic bonding.
14) In a liquid, the energy required to increase the surface of the area by a unit amount is called
- A) viscosity.
- B) surface tension.
- C) dipole-dipole force.
- D) hydrogen bonding.
- E) capillary action.
15) A paper clip floating on the top of water is an example of
- A) capillary action.
- B) viscosity.
- C) hydrogen bonding.
- D) surface tension.
- E) dipole-dipole forces.
16) Identify the term used to describe the ability of a liquid to flow against gravity up a narrow tube.
- A) capillary action
- B) viscosity
- C) surface tension
- D) density
- E) none of the above
17) Capillary action occurs because
- A) cohesive forces are greater than adhesive forces.
- B) adhesive forces equal adhesive forces.
- C) adhesive forces are greater than cohesive forces.
- D) surface tension is high.
- E) surface tension is low.
18) Define vaporization.
- A) A liquid becomes a gas.
- B) A gas becomes a liquid.
- C) A gas becomes a solid.
- D) A solid becomes a gas.
- E) A solid becomes a liquid.
19) Define condensation.
- A) A liquid becomes a gas.
- B) A gas becomes a liquid.
- C) A gas becomes a solid.
- D) A liquid becomes a solid.
- E) A solid becomes a liquid.
20) Describe sweating in humans.
- A) It is an endothermic reaction.
- B) The sweat evaporates absorbing heat from the body.
- C) The skin is cooled.
- D) None of the above
- E) All of the above