18. Which process is endothermic? A) gas-liquid B) liquid-gas C)liquid- solid D)

Question

18. Which process is endothermic? A) gas-liquid B) liquid-gas C)liquid- solid D) gas solid E) none of the above 19. Which process is endothermie? A) Water condenses on the outside of a cold soda can. B) The melted wax hardens after a candle is extinguished C) Water vapor forms ice crystals in the upper atmospbere. D) Gasoline spilled on the ground evaporates very quickly E) none of the above 20. Which of the following cannot have hydrogen bonds? B) NHF2 A) H:0 C) NH D) HBr E) none of the above f the assumptions of the kinetio-molecular theory best explains the observation that a balloon collapses when exposed to liquid nitrogen (which is much colder than a cold winter day!)? A) Gas molecules move at random with no attractive forces between them. B) The velocity of gas molecules is proportional to their Kelvin temperature. C) The amount of space occupied by a gas is much greater than the volume of the actual gas molecules, E) none of the above s, energy is conserved. 22. Which represents the largest pressure? B) 1.1 atm A) 101 kPa C) 14.7 lbs/in D) 760 mmHg E) none of the above 23. The number of mmHg in one atmospbere its A) 14.7 B) 760 C) 1.00 D) 101.325 E) none of the above 24. If the volume of a 1.75 liter sample of gas at 40.0C changes to 1.57 liters under constant pressure must be the new temperature? what A)-273C B)7.79C C)-1.18cD)35.8E) one of the above How many grams of Cl; are contained in a 25.0 L sample at 5.20 atm and 28.0°C? A) 1810 g 168 gC)84.2g D)5.26 E)none of the above 26. The concentration of nitrogen in water is 4.89 x 10*M when the partial pressure of nitrogen above the water is 0.782 atm. What will be the concentration if the partial pressure increases to 2.74 atm? A) 7160 atm)1.40x 10at C) 584 atm D) 0.00171 etm E) none of the above 27. What is the total pressure of a respectively? mixture of He and H2 if the partial pressures are 320 mmHg and 800 mmig A) 40 mmHg B) 60 mmHg C) 320 mmHg D) 480 mmHg E) none of the above 28. The amount of energy involved in boiling a substance without changing its temperature is called the A) heat of vaporization. B) calorie. C) heat of combustion D) heat of fusion. E) none of the above Water has a lower boiling point at hi A) the atmospheric pressure is greater. C) the vapor pressure of water is less 29. B) the atmospheric pressure is less E) none of the above D) the vapor pressure of water is greater.

Explanation / Answer

Answer 18 B liquid to gas

Answer 19 D gasoline spilled on the ground evaporates very quickly

Answer 20 D hbr

Answer 21 B the velocity ofgas molecules is proportional to their Kelvin temprature

Answer 22 B 1.1 atm

Answer 23 B 760 mmhg

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