Multiple
Choice
Identify the letter of the choice that best completes the statement or answers the
question.
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1.
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A battery-operated power tool,
such as a cordless drill, converts a. | electrostatic energy to chemical potential
energy. | b. | mechanical energy to thermal energy. | c. | thermal energy to mechanical energy. | d. | thermal energy to chemical potential energy. | e. | chemical potential energy to mechanical energy. | | |
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2.
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Which one of the following
statements is INCORRECT? a. | Energy is neither created nor destroyed in
chemical reactions. | b. | Kinetic energy is the energy associated
with motion. | c. | Exothermic processes transfer heat from the surrounding into the
system. | d. | Increasing the thermal energy of a gas increases the motion of its
atoms. | e. | Energy is the capacity to do work. | | |
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3.
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How many nutritional calories
are equivalent to 875 kJ? a. | 0.875 Cal | b. | 209 Cal | c. | 3.66 ×
103 Cal | d. | 2.09 ×
105 Cal | e. | 3.66 ×
106 Cal | | |
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4.
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Specific heat capacity
is a. | the quantity of heat needed to change 1.00 g of a substance by 1.00
K. | b. | the mass of a substance that 1.00 J of energy will heat by 1.00
K. | c. | the mass of a substance that 1.00 cal of energy will heat by 1.00
K. | d. | the temperature change undergone when 1.00 g of a substance absorbs
4.184 J. | e. | the quantity of heat required to melt 4.184 g of a
substance. | | |
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5.
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Heat capacity is defined
as a. | the amount of heat required to raise the temperature of 1 gram of substance by 1
K. | b. | the amount of heat required to raise the temperature of a substance by
1 K. | c. | the amount of heat required to vaporize a solid or
liquid. | d. | the amount of heat required to melt a solid. | e. | 4.18 cal/g·K. | | |
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6.
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Which one of the following
statements is INCORRECT? a. | In an exothermic process heat is
transferred from the system to the surroundings. | b. | The greater the heat capacity of an object, the more thermal energy it can
store. | c. | The SI unit of specific heat capacity is joules per gram per
Kelvin. | d. | The specific heat capacity has a positive value for liquids and a
negative value for gases. | e. | When heat is transferred from the system
to the surroundings, q is negative. | | |
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7.
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If 136 J is required to change
the temperature of 8.75 g of mercury by 35.0 K, what is the specific heat capacity of
mercury? a. | 0.0294 J/g·K | b. | 0.311 J/g·K | c. | 0.417
J/g·K | d. | 0.444 J/g·K | e. | 2.25 J/g·K | | |
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8.
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If 50.0 g H2O at
13.6 °C is combined with 85.0 g H2O
at 93.7 °C, what is the final temperature of the
mixture? The specific heat capacity of water is 4.184 J/g·K. a. | 26.1 °C | b. | 40.0 °C | c. | 56.1 °C | d. | 64.0 °C | e. | 80.1 °C | | |
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9.
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The heat of vaporization of
benzene, C6H6, is 30.8 kJ/mol at its boiling point of 80.1 °C. How much heat is required to vaporize 128 g benzene at its boiling
point? a. | 4.04 kJ | b. | 18.8 kJ | c. | 19.3 kJ | d. | 50.5 kJ | e. | 4.04 × 103
kJ | | |
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10.
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If 1.86 g MgO is combined with
100.0 mL of 1.00 M HCl (density 1.00 g/mL) in a coffee cup calorimeter, the temperature of the
resulting solution increases from 21.3 °C to
35.7 °C. Calculate the enthalpy change for the
reaction per mole of MgO. Assume that the specific heat capacity of the solution is 4.18
J/g·K. a. | -6.13 kJ | b. | -28.3 kJ | c. | -130. kJ | d. | -329 kJ | e. | -613 kJ | | |
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