Chemistry Practice Questions V with Answers

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