Name: ______________________

Gizmo Lab: Calorimetry Lab – Alternate Assignment

1. Which of the following substances could be heated from 20°C to 100°C most quickly? Assume identical heat sources are used on all substances.

A. gold

B. platinum

C. silver

D. tin

2. A chemist mixes 500 g of lead at 500°C with 1,200 g of water at 20°C. She then mixes 500 g of copper at 500°C with 1,200 g of water at 20°C. The specific heat capacity of lead is 0.1276 J/g°C and the specific heat capacity of copper is 0.3845 J/g°C. What will be true about the final temperatures of the two systems?

A. The final temperature of the lead-water system will be equal to the final temperature of the copper-water system.

B. The final temperature of the lead-water system will be higher than the final temperature of the copper-water system.

C. The final temperature of the lead-water system will be lower than the final temperature of the copper-water system.

D. Cannot be determined from the given information.

3. A blacksmith heats a 1,540 g iron horseshoe to a temperature of 1445°C before dropping it into 4,280 g of water at 23.1°C. If the specific heat of iron is 0.4494 J / g °C, and the water absorbs 947,000 J of energy from the horseshoe, what is the final temperature of the horseshoe-water system after mixing?

A. 734°C

B. 298°C

C. 76.7°C

D. 29.8°C

4. A chemist mixes 75.0 g of an unknown substance at 96.5°C with 1,150 g of water at 25.0°C. If the final temperature of the system is 37.1°C, what is the specific heat capacity of the substance? Use 4.184 J / g °C for the specific heat capacity of water.

A. 368 J / g °C

B. 13.1 J / g °C

C. 0.368 J / g °C

D. 0.0112 J / g °C

5. Based on the graphs below, which of the following substances has the highest specific heat capacity? Assume each experiment began with 200 g of the substance at 100°C mixed with 500 g of water at 20°C.

6. A chef leaves a copper spoon, a wooden spoon, and a steel spoon in a pot of boiling soup for several minutes. Which spoon should the chef grab with his bare hand to stir the soup?

A. The copper spoon

B. The wooden spoon

C. The steel spoon

D. The three spoons will be equally hot.

7. A hot sun warms the surface of a lake on a calm day. What will happen to the cold water at the bottom of the lake?

A. The cold water at the bottom will rise up and mix with the warm water at the top.

B. The warm water at the top will sink down and mix with the cold water at the bottom.

C. The cold water will remain at the bottom and will not mix with the warm water at the top.

D. Both A and B are true.

8. Which set of flasks will change temperature most quickly?

A. Set A (solid gold chunk between flasks)

B. Set B (solid stone chunk between flasks)

C. Set C (solid glass chunk between flasks)

D. Set D (solid rubber chunk between flasks)

9. A copper rod connects two insulated beakers that contain liquids. The temperature of the liquid in Beaker A is 85°C and the temperature in Beaker B is 15°C. Over the next 60 seconds, what will occur?

A. The temperature in Beaker A will decrease and the temperature in Beaker B will stay the same.

B. The temperature in Beaker A will decrease and the temperature in Beaker B will increase.

C. Both of the temperatures will remain the same.

D. It is impossible to tell without more information.

10. Two sets of flasks are connected by a hollow copper pipe, as shown. Which set will change temperature most quickly?

A. Set A (cold water above, hot water below)

B. Set B (hot water above, cold water below)

C. The temperatures will change at the same rate in each set.

D. More information is needed.

11. Insulators prevent the loss of heat. A company is designing a mug that will keep coffee warm for a long time. Which one of these materials would do this best?

A. Copper

B. Steel

C. Lead

D. Rubber

12. The two insulated beakers shown contain equal amounts of identical liquids. The temperature of Beaker A is 80°C. The temperature of Beaker B is 50°C. A copper rod connects the beakers. The system is then left alone for several hours. What would you expect to find when the system is examined after this time?

A. The temperature of Beaker A would be 50°C and the temperature of Beaker B would be 80°C.

B. The temperatures of the two beakers would be unchanged.

C. Both of the beakers would be at a temperature of 50°C.

D. Both of the beakers would be at a temperature of 65°C.

13. The two insulated beakers shown contain equal amounts of identical liquids. The temperature of Beaker A is 85°C. The temperature of Beaker B is 40°C. A metal rod connects the beakers. Five minutes later, the temperature of Beaker A is 75°C and the temperature of Beaker B is 50°C. What might the temperatures be after another five minutes have passed?

A. Temp. of Beaker A = 68°C, Temp. of Beaker B = 57°C

B. Temp. of Beaker A = 64°C, Temp. of Beaker B = 61°C

C. Temp. of Beaker A = 68°C, Temp. of Beaker B = 48°C

D. Temp. of Beaker A = 68°C, Temp. of Beaker B = 53°C

14. Two insulated beakers contain different amounts of identical liquids. Beaker A contains twice as much liquid as Beaker B. The temperature of Beaker A is 80°C. The temperature of Beaker B is 40°C. An aluminum rod connects the beakers, and the system is left alone for several hours. What would you expect to find at this time?

A. The temperature of both beakers will be 80°C.

B. The temperature of both beakers will be greater than 60°C and less than 80°C.

C. The temperature of both beakers will be less than 60°C and greater than 40°C.

D. The temperature of both beakers will be 60°C.

15. The two systems shown below are identical except for the rod connecting the two beakers. Initially the temperatures of the beakers are as follows:

Beaker A = 88°C

Beaker B = 42°C
Beaker C = 88°C
Beaker D = 42°C

Four minutes later the temperatures are as follows:

Beaker A = 73°C
Beaker B = 57°C
Beaker C = 70°C
Beaker D = 60°C

What can you conclude?

A. Beakers A and B will reach their final temperatures first.

B. Beakers C and D will reach their final temperatures first

C. All four beakers will reach their final temperatures at the same time.

D. It is impossible to determine which will occur based on the given information.

16. Why is your answer to #15 the correct one? What do you know about the materials used to connect the beakers? (Worth 10 points)