Evaporation 23 Quiz

1) Evaporation is a cooling process because A) heat is radiated during the process. B) of conduction and convection. C) the more energetic molecules are able to escape the liquid. D) the temperature of the remaining liquid decreases. E) none of these

2) To say that evaporation is a cooling process is to say that the A) more energetic particles escape. B) more energetic particles remain in the water. C) the less energetic particles escape.

3) Evaporation is a cooling process and condensation is A) a warming process. B) a cooling process also. C) neither a warming nor cooling process

4) Steam burns are more damaging than burns caused by boiling water because steam A) gives up additional energy when it condenses. B) has more energy per kilogram than boiling water. C) Choices A and B are both correct. D) Choices B and C are both incorrect.

5) We feel uncomfortably warm on a muggy day because water molecules are A) evaporating from our moist bodies. B) condensing on our bodies. C) evaporating and condensing on our bodies at the same rate.

6) We are warmed by condensation because water molecules in the air that strike our bodies A) transfer some of their kinetic energy to us. B) gain kinetic energy as they change state. C) form an insulating layer on our bodies.

7) Which could burn a boy scout the most? A) 100 g of water at 100 degrees C B) 100 g of steam at 100 degrees C C) Both would be equally damaging.

8) On a humid day, water condenses on the outside of a glass of ice water. This phenomenon occurs mainly because of A) the porosity of glass. B) capillary action. C) adhesion of water molecules to glass. D) the saturation of cooled air. E) evaporation.

9) When water vapor condenses on the inside of a window, the room becomes slightly A) warmer. B) cooler. C) neither warmer nor cooler.

10) For increased atmospheric pressure, the boiling temperature of a liquid A) goes down. B) goes up. C) remains at 100 degrees C.

11) Increased air pressure on the surface of hot water tends to A) prevent boiling. B) promote boiling. C) Neither choice A nor choice B is true. D) Choice A and choice B are both true.

12) Near the top of a mountain, water in an open pot boils at A) a higher temperature than at sea level. B) a lower temperature than at sea level. C) the same temperature as at sea level. D) None of the above choices are true.

13) When bringing water to a boil in the mountains, the time needed to reach the boiling point is A) less than at sea level. B) more than at sea level. C) the same as at sea level.

14) Food in a pressure cooker is cooked faster because of the A) higher temperature. B) greater rate of bubble formation in the water. C) increased internal energy in the water. D) Choices A, B, and C are all true.

15) When a gas is changed to a liquid state, the gas A) releases energy. B) absorbs energy. C) neither releases nor absorbs energy. D) both releases and absorbs energy.

16) When a solid is changed to a liquid state, the solid A) releases energy. B) absorbs energy. C) neither releases nor absorbs energy. D) both releases and absorbs energy.

17) When liquids change to a solid state, they A) absorb energy. B) release energy. C) neither absorb nor release energy. D) both absorb and release energy.

18) To turn ice at zero degrees Celsius to water at zero degrees Celsius, we must add A) temperature. B) energy. C) force. D) time. E) It can't be done - water is always warmer than that.

19) A refrigerator A) produces cold. B) causes internal energy to disappear. C) removes internal energy from inside the refrigerator. D) changes heat into cold. E) none of these

20) The cooling effect inside a refrigerator is produced by A) an electric motor that converts electrical energy into internal energy. B) compressing the refrigeration gas into a liquid. C) vaporizing the refrigeration liquid. D) proper insulation. E) replacing the warmer air with colder air.

21) The food in a refrigerator is cooled by A) vaporization of the refrigerating fluid. B) condensation of the refrigerating fluid. C) the ice in your nearby freezer.

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

23) Melting snow A) warms the surrounding air. B) cools the surrounding air. C) neither warms nor cools the surrounding air.

24) To increase the temperature of 50 grams of water by 2 Celsius degrees requires A) 0.04 calorie. B) 2 calories. C) 4.18 calories. D) 25 calories. E) 100 calories.

25) To melt 50 grams of 0-degree-Celsius ice requires A) 25 calories. B) 50 calories. C) 80 calories. D) none of these

26) To turn 50 grams of boiling water to steam requires A) 50 calories. B) 500 calories C) 540 calories. D) more calories than are required to bring 50 grams of ice at absolute zero to the boiling point. E) None of the above choices are correct.

27) The calories needed to change 10 grams of ice at zero degrees C to steam at 100 degrees C is A) 6200. B) 6400. C) 7200. D) 8000. E) None of the above choices are correct.

28) Which involves the larger number of calories? A) the condensation of 1 gram of steam at 100 degrees Celsius to water at 100 degrees B) the cooling of 1 gram of water at 100 degrees Celsius to 1 gram of ice at absolute zero C) Both involve the same number of calories. D) Neither involves calories.

29) The minimum amount of 100-degree-C steam needed to melt 1 gram of 0-degree-Celsius ice is A) 0.125 gram. B) 0.148 gram. C) 6.75 grams. D) 8 grams. E) none of these

30) The mass of ice that can be melted by 1 gram of 100-degree-C steam is (Hint: Don't forget about hot water remaining from condensed steam.) A) 0.125 gram. B) 0.148 gram. C) 6.75 grams. D) 8 grams. E) none of these

31) When a block of ice at zero degrees Celsius melts, the ice A) absorbs energy from its environment. B) releases energy to its environment. C) absorbs energy and gets warmer. D) releases energy and gets warmer. E) absorbs energy but does not change its temperature.

32) The lowest temperature possible in nature is A) 0 degrees C. B) -273 degrees C. C) 4 K.

33) The first law of thermodynamics is a restatement of the A) principle of entropy. B) law of heat addition. C) Carnot cycle. D) conservation of energy. E) none of these

34) Suppose you rapidly stir some raw eggs with an eggbeater. The temperature of the eggs will A) increase. B) decrease. C) remain unchanged.