Evaporation

Condensation

Boiling

Freezing, Regelation

-- Questions -- MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

1) Increased air pressure on the surface of hot water tends to promote boiling. prevent boiling. C) neither. 2) When a solid is changed to a liquid state, the solid A) neither releases nor absorbs energy. B) releases energy. C) absorbs energy.

3) When a gas is changed to a liquid state, the gas A) absorbs energy. B) releases energy. C) neither releases nor absorbs energy. 4) A refrigerator A) causes internal energy to disappear. B) removes internal energy from inside the refrigerator. C) produces cold. D) changes heat into cold. E) none of these.

5) You can briefly touch a hot clothes iron with your bare finger if it is wet because the wetness A) provides an insulating vapor layer after it changes state. B) absorbs energy in vaporizing. C) both of these. D) neither of these. 6) In the mountains, water in an open pot boils at A) the same temperature as at sea level. B) a lower temperature than at sea level. C) a higher temperature than at sea level.

7) A substance can be sprayed on crops to prevent frost formation under many conditions. If frost did not form on the fields and woods of an entire continent, cold nights would be no different. even colder. C) less cold. 8) Firefighters find that the temperature of burning material is best lowered when water is sprayed as a fine mist. B) used in small amounts. C) pointed away from the flames. D) salted.

9) When bringing water to a boil in the mountains, the time needed to reach the boiling point is A) the same as at sea level. B) less than at sea level. C) more than at sea level. 10) When liquids change to a solid state, they A) release energy. B) neither absorb nor release energy. C) absorb energy.

11) Melting snow A) cools the surrounding air. B) neither warms nor cools the surrounding air. C) warms the surrounding air. 12) When snow forms in clouds, the surrounding air A) neither warms nor cools. B) cools. C) warms.

13) To melt 50 grams of 0-degree-Celsius ice requires 25 calories. 50 calories. 80 calories. D) none of these. 14) The mass of ice that can be melted by 1 gram of 100-degree-C steam is A) 0.125 gram. B) 0.148 gram. C) 6.75 grams. D) 8 grams. E) none of these.

15) Compared to a glass of icewater with ice in it, a glass of plain ice-cold water without ice on a warm day will warm up A) slower. B) in the same amount of time. C) faster. 16) Morning dew on the grass is a result of A) the open-structured form of water crystals. B) slow-moving water molecules sticking to one another. C) air pressure on water vapor. D) evaporation of water. E) none of these.

-- Answers -- MULTIPLE CHOICE. The one alternative that best completes the statement or answers the question.

Chapter 17 1) Answer: B 2) Answer: C 3) Answer: B 4) Answer: B 5) Answer: C 6) Answer: B 7) Answer: B 8) Answer: A 9) Answer: B 10) Answer: A 11) Answer: A 12) Answer: C 13) Answer: D 14) Answer: D 15) Answer: C 16) Answer: B