A).5 atm B) 1 atm C) 1.5 atm D) 2 atm E) it is impossible to tell

Transcription

1 1. ne atmosphere is equivalent to A) 1.00 g ml 1 B) 22,400 ml ) 273 K D) 760. mmhg E) 298 K 2. A cylinder contains 2.50 L of air at a pressure of 5.00 atmospheres. At what volume, will the air exert a pressure of 1 atmosphere, at the same temperature? A) L B) 2.00 L ) 7.50 L D) 10.0 L E) 12.5 L 3. At a constant pressure, 20 L of a gas at 400 K is expanded to 30 L. The final temperature of the gas is A) 267 K B) 390 K ) 600 K D) 2,200 K E) 4,000 K 4. There are 2.0 moles of hydrogen, 3.0 moles of nitrogen and 5.0 moles of fluorine in a sealed container. The total pressure is 20.0 atmospheres. What is the partial pressure of the F2, in atmospheres? A) 6.0 atm B) 10.0 atm ) 4.0 atm D) 20.0 atm E) 14.0 atm 5. Which statement is true? A) A decrease in pressure of a gas causes an decrease in volume. B) Absolute zero is 273 K. ) In a mixture of gases, the gas with the most molecules exerts the most pressure. D) An increase in the pressure of a gas could be caused by decreasing the number of molecules. E) The partial pressure of a gas is dependent on its mass. 6. What is the final volume when both the pressure and the Kelvin temperature of 8.0 Liters of an ideal gas are doubled? A) 4.0 L B) 8.0 L ) 16 L D) 24 L E) 32 L 7. A sample of an ideal gas has a volume of ml at 100. mmhg and 127. What would be its volume at ST? A) 341 ml B) 733 ml ) 1,970 ml D) 4,230 ml E) 17,200 ml 8. Which statement best explains why a confined gas exerts pressure? The molecules: A) attract each other B) are in random motion ) travel in straight lines D) collide with the container walls E) collide with each other 9. Under the same conditions of temperature, pressure, and volume, as the molecular mass of gaseous molecules increases, the number of molecules A) decreases B) increases ) remains the same D) is always different E) cannnot be determined from the information given 10. The average kinetic energy of water molecules is greatest in which of these samples? A) 10 g of water at 35 B) 10 g of water at 55 ) 100 g of water at 25 D) 100 g of water at A gas behaves most nearly like an ideal gas when under conditions of A) low pressure and low temperature B) high pressure and low temperature ) low pressure and high temperature D) high pressure and high temperature E) high density and high pressure 12. Based on the image below, what is the atmospheric pressure? A).5 atm B) 1 atm ) 1.5 atm D) 2 atm E) it is impossible to tell

2 13. The vapor pressure of a liquid depends upon A) the amount of liquid present B) the surface area of the liquid ) the temperature of the liquid D) the external pressure on the liquid E) the mass of the liquid 14. During the slow melting of a pure substance, the temperature A) rises B) falls ) stays constant D) changes abruptly E) rises then falls 15. The amount of energy needed to change a given mass of solid to liquid at constant temperature is called the Heat of A) Fusion B) Formation ) rystallization D) ondensation E) Fission 16. Which is the best name for the phase change represented by the equation? 2(s) 2(g) A) condensation B) evaporation ) sublimation D) vaporization E) deposition 17. Base your answer to the following question on this phase diagram. What is the normal boiling point of the substance on the graph above? A) 100 o B) 80 o ) 290 o D) 5.5 o E) 1.5 o

3 18. The temperature of a sample of carbon dioxide gas is a measure of its A) total potential energy B) average kinetic energy ) average potential energy D) total kinetic energy E) kinetic and potential energy 19. Fifty grams ( g) of water is heated from to. How much heat is absorbed? A) B) ) D) E) 20. To what temperature in Kelvin does 273 correspond? A) 0 K B) 32 K ) 273 K D) 546 K E) 646 K 21. A beaker of water is heated for ten minutes. If the water absorbs 370 calories and its temperature is raised from 25 to 47, what is the mass of water contained in the beaker? A) 0.68 g B) 5.95 g ) 16.8 g D) 37.3 g E) 81.4 g 22. Heat of Fusion of Water, H2 = 340 J g 1 What quantity of ice can be melted by 58,000 Joules? A) g B) g ) g D) g E) g 23. At a fixed temperature and pressure, the average distance between molecules would be greatest in a sample of A) air B) wood ) water D) sponge rubber E) diamond 24. If a gas is cooled in a closed container, its molecules A) move faster B) move more slowly ) occupy a smaller volume D) have more collisions per unit time E) decrease in mass 25. Which is a basic assumption of the kinetic molecular theory? A) articles are in constant motion B) articles lose energy as their velocity increases ) articles travel faster as the temperature decreases D) articles lose energy when the temperature increases E) articles lose energy when they collide 26. The effect of gases due to constant striking of the walls of a container by moving molecules is its A) mass B) density ) pressure D) diffusion E) temperature 27. Avogadro s principle states that equal volumes of all gases at the same temperature and pressure contain the same number of A) electrons B) atoms ) ions D) elements E) molecules 28. Water boils only A) at 100 B) above 100 at high elevations ) when its vapor pressure is 760 mmhg D) when its vapor pressure equals atmospheric pressure E) when its vapor pressure goes below atmospheric pressure 29. When a sample of a liquid changes to a gas the A) heat of fusion is absorbed B) heat of fusion is evolved ) heat of vaporization is absorbed D) heat of vaporization is evolved E) potential energy remains the same

4 30. Heat is steadily applied to a sample of a pure substance. What is the melting point of this material? A) 15 B) 35 ) 62 D) 90 E) 148

5 Answer Key BM 1. D 2. E B B 7. A 8. D B B A B 18. B 19. A 20. D B 23. A 24. B 25. A E 28. D B