K12 Chem 4.05 Chemical Thermodynamics

The amount of heat needed to raise 25 g of a substance by 15°C is 293 J. What is the specific heat of the substance? Use the equation C = q/mΔT.

0.78 J/g-°C

The temperature of 100 g of liquid water in a calorimeter changes from 25°C to 50°C. How much heat was transferred? Use the equation C = q/mΔT. The specific heat of liquid water is 4.18 J/g-°C.

10.5 kJ

Which of the following statements is true about the specific heat capacities of various substances?

Liquid water has a relatively high specific heat capacity compared to most other substances.

What is the difference between heat capacity and specific heat?

Only specific heat accounts for mass.

Substances A-D have the following specific heats (J/g-°C): A = 0.90, B = 1.70, C = 2.70, D = 4.18. When equal masses are heated to the same temperature, which substance will cool the fastest?

substance A