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The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.
| C | I | Question | Answer |
|---|---|---|---|
| 10 | The mass of a hot-air balloon and its cargo (not including the air inside) is 200 kg. The air outside is at a temperature of 10°C and a pressure of 1 atm = 10^5 N/m2. The volume of the balloon is 400 m^3. Which temperature below of the air in the balloon will allow the balloon to just lift off? (Air density at 10°C is 1.25 kg/m3.) | 200°C | |
| 10 | The observation that materials expand in size with an increase in temperature can be applied to what proportion of existing substances? | most | |
| 10 | The pressure in a constant-volume gas thermometer extrapolates to zero at what temperature? | 0K | |
| 10 | The sulfur hexafluoride molecule consists of one sulfur atom and six fluorine atoms. The atomic masses of sulfur and fluorine are 32.0 u and 19.0 u respectively. One mole of this very heavy gas has what mass? | 146 g | |
| 10 | The thermal expansion of a solid is caused by: | increasing the distance between equilibrium positions for the vibrating atoms. | |
| 10 | The zeroth law of thermodynamics pertains to what relational condition that may exist between two systems? | thermal equilibrium | |
| 10 | Tricia puts 44 g of dry ice (solid CO2) into a 2.0-L container and seals the top. The dry ice turns to gas at room temperature (20°C). Find the pressure increase in the 2.0-L container. (One mole of CO2 has a mass of 44 g, R = 0.082 1 L*atm/mol*K. Ignore the initial volume of the dry ice.) | 12 atm | |
| 10 | Two ideal gases, X and Y, are thoroughly mixed and at thermal equilibrium in a single container. The molecular mass of X is 9 times that of Y. What is the ratio of root-mean-square velocities of the two gases, vX, rms /vY, rms? | 1/3 | |
| 10 | Two moles of an ideal gas at 3.0 atm and 10°C are heated up to 150°C. If the volume is held constant during this heating, what is the final pressure? | 4.5 atm | |
| 10 | Two moles of nitrogen gas are contained in an enclosed cylinder with a movable piston. If the gas temperature is 298 K, and the pressure is 1.01*10^6 N/m2, what is the volume? (R = 8.31 J/mol*K) | 4.90*10^-3 m^3 | |
| 10 | Two moles of nitrogen gas are contained in an enclosed cylinder with a movable piston. If the molecular mass of nitrogen is 28, how many grams of nitrogen are present? | 56 | |
| 10 | Two one-liter containers each contain 10 moles of a gas. The temperature is the same in both containers. Container A holds helium (molecular mass = 4 u), and Container B holds oxygen (molecular mass = 16 u). Which container has the higher pressure and by what factor? | Both containers have the same pressure. | |
| 10 | What happens to a given mass of water as it is cooled from 4°C to zero? | expands | |
| 10 | What happens to a given volume of water when heated from 0°C to 4°C? | density increases | |
| 10 | What happens to a volume of water when its temperature is reduced from 8°C to 4°C? | density increases |
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