1 markCup | Specific heat capacity of spoon (J / g oC) | Mass of spoon (g) | Initial temperature of spoon (oC) |
|---|---|---|---|
A | 0.90 | 7.0 | 20 |
B | 0.39 | 20.0 | 20 |
C | 0.84 | 15.0 | 20 |
D | 0.24 | 25.0 | 20 |
Four identical 300 mL cups of fresh brewed coffee, originally at 91 °C, were stirred with different spoons, as listed in the table above.
In which cup will the temperature of the coffee be highest at thermal equilibrium?
(Assume that the heat lost to the surroundings is negligible.)
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Which of the following is the minimum amount of data needed to determine the molar enthalpy of solution of KNO3 (s) in pure H2O (l)?
(Assume that the KNO3 (aq) has the same specific heat capacity as pure water and that the initial temperatures of the KNO3 (s) and the water are the same.)
Mass of KNO3 (s), initial temperature of the water, and final temperature of the solution
Mass of H2O, initial temperature of the water, and final temperature of the solution
Mass of KNO3 (s), mass of H2O, initial temperature of the water, and final temperature of the solution
Mass of KNO3 (s), mass of H2O, initial temperature of the water, final temperature of the solution, and atmospheric pressure
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Which of the following phase changes would result in the greatest increase in the potential energy of the system?
Condensation of steam.
Melting of ice.
Sublimation of dry ice (solid CO2).
Vaporization of water.
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During a phase change, which of the following statements is true regarding the kinetic and potential energies of the particles?
Both kinetic and potential energies increase.
Kinetic energy remains constant while potential energy increases.
Kinetic energy increases while potential energy remains constant.
Both kinetic and potential energies remain constant.
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