Practice_Test_1_with_Solutions

Practice_Test_1_with_Solutions - Solutions to Practice Test...

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Solutions to Practice Test 1 1. Temperature of a substance is proportional to b. the average kinetic energy of its molecules 2. The length of the mercury column in a thermometer is 2.8 cm when immersed in ice water and 22.4 cm when immersed in boiling water. What is the length of the mercury column at 72 o C? 0 100 0 100 2.8 cm ( 2.8)100 72 100 22.4 2.8 19.6 1411.2 100 280 16.91 cm o t o tt t t LL tC C L L −− = =− = a. 16.9 cm 3. In question 2, what temperature corresponds to a length of 12.8 cm? 0 100 0 100 12.8 2.8 cm ( 2.8)100 100 51 22.4 2.8 19.6 o t o t L C == c. 51 o C 4. A constant volume gas thermometer has a pressure of 4.0 kPa when it reads a temperature of 373 K. What is the triple point pressure P 3 ? 3 3 3 273.16 273.16 373 4.0 kPa 273.16 4.0 kPa 2.93 kPa 373 TP P P P = = d. 2.9 kPa 5. If the triple point pressure is 4.5 kPa, what is the pressure corresponding to the boiling point of water? Boiling point of water is 373 K
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3 273.16 273.16 373 4.5 373 4.5 6.14 kPa 273.16 TP P P P = × == a. 6.14 kPa 6. When a metal rod is heated, its linear expansion doe not depend on its: d. specific heat capacity 7. When a 1.5-m long steel rod is heated form 20 o C to 80 o C, its length increases by: ( α for steel is 11.0 x 10 -6 /K) l = l α t = 1.5 × 11 × 10 -6 (80 – 20) = 0.0009 m = 1 mm c. 1.0 mm 8. A cylinder contains a gas at a pressure of 2.5 atm when the temperature is 30 o C. If the temperature is increased to 70 o C, what will be the pressure of the gas? Since volume is a constant, P/T is a constant 12 2 1 2.5 atm 340 K 2.83 atm 300 K PP TT PT P T = × = d. 2.83 atm 9. A cubical container of side 1.0 m contains 10 moles of a gas at a temperature of 55 o C. What is the pressure of the gas? V = 1 m 3 , n = 10, T = 325 K PV = nRT 10 8.314 325 27020 Pa 27 kPa 1 nRT P V ×× = = d. 27 kPa 10. If the pressure and volume of an ideal gas are doubled, what happens to its absolute temperature? PV = nRT PV T nR = When P and V are doubled T becomes 4 times as much. c. Its absolute temperature is quadrupled
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11. An isothermal process is one in which a. The temperature remains a constant 12. An isobaric process is one in which c. The pressure remains a constant 13. An adiabatic process is one in which d. No heat is added or removed from the system 14. The kinetic theory of gases assumes that b. The molecules of a gas are in random motion, and their behavior is described by Newton’s laws.
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Practice_Test_1_with_Solutions - Solutions to Practice Test...

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