6.3-6.4

Possible Quiz Questions

Multiple Choice

A 30. g sample of Al (s) is heated to 50 C and placed in a calorimeter containing 150 g of water at 20 C. As the system approaches thermal equilibrium, energy is transferred...

• from the AL (s) to the water and the temperature of the water decreases

• from the Al (s) to the water and the temperature of the Al (s) decreases

• From the water to the Al (s) and the temperature of the water increases

• from the water to the Al (s) and the temperature of the Al (s) increases

Multiple Choice

A piece of Fe (s) at 25 C is placed into H2O (l) at 75 C in an insulated container. A student predicts that when thermal equilibrium is reached, the Fe atoms, being more massive than the H2O molecules, will have a higher average kinetic energy than the H20 molecules. Which of following best explains why the student's prediction is incorrect>

Multiple Choice

The graphs show Maxwell-Boltzmann distributions for one-mole samples of Ar (g). Graph 1 shows the distribution of particle energies at 300K and graph 2 shows the distribution of energies at 600 K. A student predicts that if the samples are combined in an insulated container and thermal equilibrium is attained, then the most probable particle energy will be between the most probable energy shown in graph 1 and the most probable energy shown in graph 2. Which of the following is the best justification for the students claim?

​Al (s)

Possible Quiz Questions

Multiple Choice

For an experiment, 50.0g of H2O was added to a coffee-cup calorimeter, as shown in diagram 1. The initial temperature of the H2) was 22.0 C, and it absorbed 300 J of heat from an object that was carefully placed inside the calorimeter. Assuming no heat is transferred to the surroundings, which of the following was the approximate temperature of the H2O after thermal equilibrium was reached (specific heat for water is 4.2 J/g K)

• 21.3 C

• 22.0 C

• 22.7 C

• 23.4 C

Multiple Choice

Four identifal 50 mL cups of coffee, originally at 95 c, were stirred with four different spoons as listed in the table. In which cup will the temperature of the coffee be the HIGHEST at thermal equilibrium?

• Cup A

• Cup B

• Cup C

• Cup D

Multiple Choice

In an insulated cup of negligible heat capacity, 50 g of water at 40 C is mixed with 30 g of water at 20 C. The final temperature of the mixture is closest to: (specific heat of water is 4.186 J / g C

• 27 C

• 30 C

• 33 C

• 38 C