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This quiz is based on Chemistry Enduring understanding: "Two systems with different temperatures that are in thermal contact will exchange energy. The quantity of thermal energy transferred from one system to another is called heat." And "Enduring understanding: Energy is neither created nor destroyed, but only transformed from one form to another." It focuses on problems involving heating and cooling, phase transitions, and gases.
The molar enthalpy of vaporization of water at 100 oC is +40.7 kJ/mol. What is the energy change if 9.0 grams of the steam condenses to water?
-20.4 kJ
20.4 kJ
-366.3 kJ/mol
366.3 kJ/mol
How much energy would it take to heat 100 g of ice at =10 degrees C to water at + 20 degrees C? Use the following heat capacities: Specific heat of ice = 2.09 J/g.degrees C, the heat of fusion of water = 334 J/g, the specific heat of water = 4.18 J/g. degrees C, the heat of vaporization of water = 2257 J/g.
269.2 kJ
43.9 kJ
4390 KJ
10.5 KJ
The piston below is compressed and radiates some heat to the environment. What is the net energy change inside the piston?
- 15 J
+10 J
15 J
9 J
A 190 g piece of copper absorbs 1600 J of heat and increases in temperature from 10 degrees C to 35 degrees C. Determine the specific heat of the copper sample.
0.39 J/g. degrees C
2 J/g. degrees C
0.34 J/g. degrees C
0.51 J/g. degrees C
A piece of iron (50 g, specific heat = 0.45 J/g.degrees C) was heated to 100 degrees C and then placed in a beaker of water (250 mL, specific heat = 4.18 J/g.oC) at 20 degrees C, and the temperature was allowed to equilibrate. Which of the following is the best description of the final temperature of the system?
The temperature will be 60 degrees C, exactly halfway between 20 degrees C and 100 degrees C
The temperature will be closer to 100 degrees C than 20 degrees C
The temperature will be closer to 20 degrees C than 100 degrees C
There is not enough information provided to determine the final temperature
What transformation does the particulate diagram below illustrate, and would this transformation result in the absorbing or release of energy by the system?
Evaporation, release of energy
Condensation, release of energy
Evaporation, absorbing of energy
Condensation, absorbing of energy
Which of the letters (A-D) represents the potential energy of the reactants?
A
B
C
D
Which of the letters (A-D) represents the potential energy of the products?
A
B
C
D
