Which heat transfer method involves the movement of heated particles within a fluid?

A. Conduction

B. Convection

C. Radiation

D. Insulation

. In a calorimetry experiment, if the final temperature of the mixture of hot metal and water is 30C, and the initial temperature of the metal was 100C while the water was at 20C, what can be inferred?

A. The metal cooled more than the water heated.

B. Some heat was lost to the environment.

C. The water gained more heat than the metal lost.

D. The system is not in thermal equilibrium.

41.It required 35.0 s for a certain number of moles of an unknown gas to effuse through a small opening. Under the same conditions, 28.0 s were required for the same number of moles of krypton gas to effuse. What is the molar mass of the unknown gas? (Molar mass of Kr = 83.80 g/mol)

A. 104.75 g/mol

B. 118.32 g/mol

C. 130.94 g/mol

D. 149.60 g/mol

42. A 150 g cup of hot tea (water) is allowed to cool to 30C. If the water gave off 231,000 J of energy, what was the initial temperature of the water?

A. 398 C

B. 590 C

C. 798 C

D. 498 C