Calorimetry Lab

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.

Correct Answer: A. Substance A

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.

Correct Answer: A. gold

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.

Correct Answer: B. 13.1 J / g °C

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?

Correct Answer: C. 76.7°C

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?

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