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Understanding Gas Pressure and Volume Relationships in Chemical Reactions

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This chapter explores the principles of gas pressure and volume in various chemical scenarios. It delves into how gas pressures relate within a bulb, the necessary volume of O2 for the complete reaction with NO, and how equal masses of different gases each behave under the same conditions. Additionally, it discusses the impact of temperature and molecular speed on gas behavior, illustrated through comparisons of He and Ne at varying temperatures. Finally, the chapter addresses the effects of moving gas mixtures between flasks on their pressures.

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Understanding Gas Pressure and Volume Relationships in Chemical Reactions

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  1. Chapter 10Gases Chemistry, The Central Science, 11th edition Theodore L. Brown; H. Eugene LeMay, Jr.; Bruce E. Bursten and Catherine J. Murphy Donna Narsavage Heald Siena College Loudonville, NY  2009, Prentice-Hall

  2. What is the pressure of the gas in the bulb? • Pgas = Ph • Pgas = Patm • Pgas = Ph+ Patm • Pgas = Ph – Patm • Pgas = Patm – Ph

  3. What is the pressure of the gas in the bulb? • Pgas = Ph • Pgas = Patm • Pgas = Ph+ Patm • Pgas = Ph – Patm • Pgas = Patm – Ph

  4. 2 NO(g) + O2 (g) 2 NO2 (g) If 250 mL of NO is placed in a flask with O2, what volume of O2 is needed for complete reaction? • 100 mL • 125 mL • 200 mL • 250 mL • Cannot be determined from the given information.

  5. 2 NO(g) + O2 (g) 2 NO2 (g) If 250 mL of NO is placed in a flask with O2, what volume of O2 is needed for complete reaction? • 100 mL • 125 mL • 200 mL • 250 mL • Cannot be determined from the given information.

  6. If an equal mass of each gas is put into a separate balloon, which will have the greatest volume?Assume that they are all the same temperatureand pressure. • He • H2 • N2 • Ne • O2

  7. If an equal mass of each gas is put into a separate balloon, which will have the greatest volume?Assume that they are all the same temperatureand pressure. • He • H2 • N2 • Ne • O2

  8. If equal masses of CH4, C2H6, and C3H8 are placedin a flask, which of the following is true? • PCH4 = PC2H6 = PC3H8 • PCH4 ~ PC2H6 ~ PC3H8 • PCH4 > PC2H6 > PC3H8 • PCH4 < PC2H6< PC3H8 • None of the above

  9. If equal masses of CH4, C2H6, and C3H8 are placedin a flask, which of the following is true? • PCH4 = PC2H6 = PC3H8 • PCH4 ~ PC2H6 ~ PC3H8 • PCH4 > PC2H6 > PC3H8 • PCH4 < PC2H6< PC3H8 • None of the above

  10. Arrange the gases according to increasing molecular speed. He (25°C) He (100°C) Ne (25°C) Ne (0°C) • He (25) < He (100) < Ne (25) < Ne (0) • He (25) < He (100) < Ne (0) < Ne (25) • Ne (0) < Ne (25) < He (25) < He (100) • Ne (25) < Ne (0) < He (100) < He (25) • Ne (0) < He (25) < Ne (25) < He (100)

  11. Arrange the gases according to increasing molecular speed. He (25°C) He (100°C) Ne (25°C) Ne (0°C) • He (25) < He (100) < Ne (25) < Ne (0) • He (25) < He (100) < Ne (0) < Ne (25) • Ne (0) < Ne (25) < He (25) < He (100) • Ne (25) < Ne (0) < He (100) < He (25) • Ne (0) < He (25) < Ne (25) < He (100)

  12. flask 1 flask 2 If a mixture of gas A and gas B is moved from flask 1 to flask 2, which of the following is true: • PA, PB, and Ptot decrease. • PA, PB, and Ptot increase. • PA and PB decrease; Ptot remains the same. • PA, PB, and Ptot remain the same. • PA and PB remain the same; Ptot decreases.

  13. flask 1 flask 2 If a mixture of gas A and gas B is moved from flask 1 to flask 2, which of the following is true: • PA, PB, and Ptot decrease. • PA, PB, and Ptot increase. • PA and PB decrease; Ptot remains the same. • PA, PB, and Ptot remain the same. • PA and PB remain the same; Ptot decreases.

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