28/03/2020 Ideal Gases and Thermal Expansion(Senior Class Physics Study by Topics) 28/03/2020 0Comments by Gate Academy Welcome to your Ideal Gases and Thermal Expansion(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. When a supply of hydrogen gas is held in a 4-liter container at 320 K it exerts a pressure of 800 torrs. The supply is moved to a 2-liter container, and cooled to 160 K. What is the new pressure of the confined gas? 1600 torr 800 torr 200 torr 400 torr 2. Gas pressure is caused by: Gas molecules heating up Gas molecules hitting other gas molecules Gas molecules reacting with other gas molecules Gas molecules hitting the walls of a container 3. As the volume of confined gas decreases at the constant temperature, the pressure exerted by the gas ______. Increases Decreases Stay the same Fluctuate 4. Two gases are kept at the same temperature. If the molecules of gas A have 4 times the mass of those of gas B, what is the ratio of the rms speed of the A molecules to that of the B molecules? 1/4 4 1/2 2 5. Each of these flasks is the same size and at the same temperature. Which one contains the most molecules? Flask 2 Flask 3 Flask 4 Flask 1 6. What is the temperature of a 500 mL container of 100g of hydrogen gas held at a pressure of 0.25 atm? ____K 0.3 273 0.03 19 7. The Kelvin temperature scale has the same size degree as the_____ scale and its zero is _____ degrees lower. Fahrenheit ... 273 Celsius ... 459 Fahrenheit ... 459 Celsius ... 273 8. The mass of an oxygen molecule is 16 times that of a hydrogen molecule. If the gases are maintained at the same temperature, what is the ratio of the rms speed of an oxygen molecule to that ofa hydrogen molecule? 4 1/4 1/16 16 9. A sample of gas occupies 2.5 liters of space. How many moles of gas are there if its pressure is 1.2 atm and temperature is 25C? ___ mol (round to the nearest hundreth). 12.0 0.2 20.0 0.12 10. Two barometers are made with water and oil. The density of oil is 900 kg/m3 and that of water is 1000 kg/m3. If the oil column is 10 m tall, how tall is the water column? 9.0 m 11.1 m 10.0 m 12.0 m 11. Not all Gas Law problems have Kelvin (K) as the unit of temperature. They can be expressed in Celsius (°C) and Fahrenheit(°F). So, convert 123°C to K. 396K 486K 458K 369K 12. What volume of space would 1 mole of gas occupy if it is at a temperature of 0C and pressure of 1 atm? ____ liters (round to the nearest tenth) 22.4 14,2 24.4 12.2 13. In which direction in a fluid at rest is the pressure the greatest at a given depth? Downward Upward Horizontal The pressure is the same in all directions 14. Which Gas Law is involved when a balloon pops after being sat on? None of the Above Boyle's Law Law of Pressure Gradient Charles Law 15. In a nitrogen gas has occupied a volume of 500ml at a pressure of 0.971atm. What volume will the gas fill at a pressure of 1.50 atm, assuming the temperature remains constant? 324mL 424mL 342mL 442mL 16. Avogadro suggested that each liter of gas under identical conditions has the same Number of moles Number of molecules Mass Density 17. Which of the following types of bench would feel warmer on a cool harmattan day? Wood Marble Aluminium Iron 18. Assuming that the temperature remains constant. How can you increase the pressure of a gas? Increase the container volume Decrease the container volume Add more molecules of the gas None of the above 19. At what pressure is a 5 liter container containing 20g of oxygen gas at a temperature of 10C? ____ atm (round to the nearest tenth) 2.9 5.6 3.6 1.5 20. At constant pressure and 25°C, a sample of gas occupies 4.5 liters. At what temperature will the gas occupy 9.0 liters? 50K 596°C 596K 50°C 21. A small sample of helium gas occupies 6 mL at a temperature of 250 K. At what temperature does the volume expand to 9 mL? 2250K 500K 125K 375K 22. Organize the following gasses in order of their rates of diffusion, from slowest to fastest oxygen, O2 ammonia, NH3 hydrogen, H2 carbon dioxide, CO2 Hydrogen, ammonia, oxygen, carbon dioxide Hydrogen, oxygen, ammonia, carbon dioxide Oxygen, hydrogen, carbon dioxide, ammonia Carbon dioxide, oxygen, ammonia, hydrogen 23. The choice of thermometric liquids in a thermometer should depend on the following properties except: Must have a high coefficient of expansion Must have a high specific heat capacity Must be opaque Must have a low melting point 24. Which of the following explains why we feel cool when we stay very close to a fan? Temperature Evaporation Humidity Wind 25. Each of these flasks contains the same number of molecules. In which container is the pressure highest? Flask 3 Flask 4 Flask 2 Flask 1 1 out of 25 Time is Up! Time's up