6. In this temperature time graph for the heating of H 2O at a constant rate, the segment DE represents the

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1 1. Which of the following contains particles with the least freedom of motion? A) CO 2( ) B) HCl(aq) C) F 2(g) D) MgBr 2(s) E) C 6H 12O 6(aq) 2. During boiling, the temperature of a pure liquid substance A) increases B) decreases C) increases then decreases D) decreases then increases E) remains the same 3. The state of matter which exhibits definite volume but not a definite shape is A) liquid B) gas C) solid D) vapor E) aqueous 4. The vapor pressure of water at 50.0 C is 92.5 mmhg. What is the temperature of a sample of boiling water when its vapor pressure is 380. mmhg? A) Between 0.00 C and 50.0 C B) 50.0 C C) Between 50.0 C and 100. C D) 100. C E) Over 100. C 5. What is the approximate boiling temperature of water when the pressure is 5300 mmhg? A) 1,500 C B) 950 C C) 550 C D) 150 C E) 100 C 6. In this temperature time graph for the heating of H 2O at a constant rate, the segment DE represents the A) gas being warmed B) liquid being warmed C) liquid changing to gas D) solid changing to liquid E) gas being warmed 7. The vapor pressure of water, H 2O, at 292 K is kpa. Some oxygen, O 2 is collected over water at 292 K and the total pressure of the gas is kpa. The pressure of the oxygen is A) 98.9 kpa B) 99.9 kpa C) kpa D) kpa E) kpa 8. Which statement about evaporation is true? A) The liquid is much more compressible than the vapor B) The density of the liquid is less than that of the vapor C) The molecules become separated and exhibit relatively great distances during evaporation D) The molecules of the vapor have a different chemical composition than those of the liquid E) The molecules lose energy during the evaporation process 9. The pressure due to the molecules of a substance in the vapor above its corresponding liquid is called the A) air pressure B) vapor pressure C) oxygen pressure D) saturation pressure E) partial pressure

2 10. The vapor pressure of a liquid depends upon A) the amount of liquid present B) the surface area of the liquid C) the temperature of the liquid D) the external pressure on the liquid E) the mass of the liquid 11. The vapor pressure of a liquid depends on its A) volume B) temperature C) exposed surface area D) atmospheric pressure E) density 12. A volume of 125 ml of xenon is collected over water at a temperature of 21 C and a pressure of 817 mmhg. What is the pressure of the pure, dry xenon, in mmhg? (Vapor pressure of H 2O = 18.7 mmhg at 21ºC) A) 18.7 mmhg B) 761 mmhg C) 798 mmhg D) 817 mmhg E) 834 mmhg 13. Which equation represents sublimation? A) I 2(s) I 2(g) B) NH 3(g) NH 3(l) C) CO 2(l) CO 2(g) D) H 2O(s) H 2O(l) E) O 2(g) O 2(s) 14. If wet clothes are put outside on a clear day at a temperature of 10 C, the clothes will A) freeze and therefore not dry B) dry because the sun will heat them to near 100 C C) dry by evaporation of water only D) dry by condensation and evaporation of the water E) dry by sublimation of frozen water

3 15. The phase diagram for a pure substance is shown above. What is the normal melting point temperature for this substance? A) 5.5 o C B) 15.0 o C C) 80.0 o C D) o C E) 0 o C 16. Base your answer to the following question on this phase diagram. The critical temperature of this substance is 290 o C. What is meant by the term "critical temperature"? A) It is the temperature at which the substance can no longer exist. B) It is the temperature above which a substance can no longer be evaporated. C) It is the temperature above which a substance can no longer be liquified. D) It is the temperature above which a substance can no longer be solidified. E) It is the temperature at which all electrons enter the excited state.

4 17. In the phase diagram of water, graphing pressure versus temperature, why does the equilibrium between the solid and liquid phases curve to the left? A) The solid phase is more dense than the liquid phase. B) An increase in pressure causes the liquid to vaporize. C) The liquid phase is more dense than the solid phase. D) The liquid phase has a higher vapor pressure than the solid phase. E) At higher temperatures, the liquid is more likely to vaporize. 18. In which process will energy be evolved as heat? A) melting B) sublimation C) vaporization D) crystallization E) none of the above 19. Which substance is a network of atoms bonded by covalent bonds in a brittle crystalline arrangement A) I B) II C) III D) IV E) None of the above 20. Which compound is a network covalent solid? A) S 8(s) B) SiO 2(s) C) NaCl(s) D) C 25H 52(s) E) CO 2(s) 21. Base your answer to the following question on the table below. Which of the substances in the table are examples of network solids? A) C and SiO 2 B) H 2O and HF C) NaCl and KOH D) He, CCl 4 and CH 4 E) SiO 2 and H 2O 22. Which of the following is not considered standard temperature? A) 0 C B) 273 K C) 32 F D) 25 N E) All of the above are standard temperature mmhg is equivalent to 380. A) K B) C C) ml D) Torr E) atm 24. An example of a chemical change is A) grinding rock. B) baking a cake. C) heating water. D) breaking glass. E) melting ice. 25. Which is the most important factor that shows a substance must be a mixture rather than a compound? When it A) looks like salt B) is a uniform white powder C) is completely soluble in water D) melts in the range of 245 to 300 C E) always reacts violently with water

5 26. What would the correct equation for determining percent error be in a theoretical experiment where the experimental value is determined as 36 J and the accepted value is 38.5 J? A) B) 27. C) D) Where is the hottest part of a bunsen burner flame? A) A B) B C) C D) D E) All are at about the same temperature. 28. I. Water boils at a higher temperature at low altitudes than at high altitudes BECAUSE II. the atmospheric pressure decreases as the altitude increases. A) I is TRUE, II is FALSE B) I is FALSE, II is TRUE C) I and II are BOTH FALSE D) I and II are BOTH TRUE but II IS NOT a correct explanation of I E) I and II are BOTH TRUE and II IS a correct explanation of I

6 Answer Key Practice Questions solids and liquids 1. D 2. E 3. A 4. C 5. D 6. C 7. A 8. C 9. B 10. C 11. B 12. C 13. A 14. E 15. A 16. C 17. C 18. D 19. C 20. B 21. A 22. D 23. D 24. B 25. D 26. A 27. B 28. E