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**Q17. Thermal Behavior of Matter**

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**The area of one of its faces increases by:**

When the temperature of a copper penny is increased by 100 C°, its diameter increases by 0.17%. The area of one of its faces increases by: 0.17% 0.34% 0.51% 0.13% 0.27% <PowerClick><Answer>2</Answer><Option>5</Option></PowerClick>

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**the coefficient of volume expansion of mercury is 0.1 per F° **

The mercury column in an ordinary medical thermometer doubles in length when its temperature changes from 95°F to 105°F. Choose the correct statement: the coefficient of volume expansion of mercury is 0.1 per F° the coefficient of volume expansion of mercury is 0.3 per F° the coefficient of volume expansion of mercury is (0.1/3) per F° the vacuum above the column helps to "pull up" the mercury this large amount none of the above is true <PowerClick><Answer>5</Answer><Option>5</Option></PowerClick>

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Volume expansion V of the mercury occurs mainly in the bulb of the thermometer. The increase in length l of the mercury column is therefore given by where A = area of cross section of column V = total volume of mercury with l = l, T = 10 F, we have VC = volume of mercury column at 95 F

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Steam at 1 atm and 100°C enters a radiator and leaves as water (at 1 atm and 80°C). Take the heat of vaporization to be cal/g. Of the total energy given off as heat, what percent arises from the cooling of the water? 100 54 26 14 3.6 <PowerClick><Answer>5</Answer><Option>5</Option></PowerClick>

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**Loss of energy per gram of steam :**

Percentage due to cooling of water :

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Oxygen (molar mass = 32 g) occupies a volume of 12 liters when its temperature is 20°C and its pressure is 1 atm. Using R = literatm/moleK, calculate the mass of the oxygen: 6.4 g 10.7 g 16 g 32 g 64 g <PowerClick><Answer>3</Answer><Option>5</Option></PowerClick>

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