1) How much heat is lost by 5 grams of a metal if the temperature changed from 9

Question

1) How much heat is lost by 5 grams of a metal if the temperature changed from 90c to 40c? (c=3.95 J/gK)

A) 987.5 J

B) 63.3 J

C) 177.5 J

D) 790.0 J

2)Assume a piece of hot metal is added to a colorimeter containing 50mL of water at 22C. The amount of heat released by the metal was determined to be 1000 J, and the equilibrium temperature in the calorimeter was 26C. Remembering that the specific heat of water is 4.18 J/gC, how much heat in joiles does the clorimeter gain?

A) 164 J

B) 836 J

C) 1300 J

D) 4180 J

3)Assume the heat absorbed by the calorimeter was 200 J. What is the calorimeter constant (Heat Capacity) if the temperature changed from 22C to 26C?

A) 800 J/K

B) 4400 J/K

C) 50 J/K

D) cannot be determined.

4)Calculate the Calorimeter Constant if 25 g of water at 59C was added to 25 g of water at 25C with a resulting temperature of 35C?

Explanation / Answer

1) Q = m x dT x S

= 5 x 50 x 3.95

Q = 987.5 J

So option A) 987.5 J

2) Q for water is = 50 x (26-22) x 4.18 = 836 J so the remaining heat is transfered to the calorimeter which is 1000-836 = 164 J

A) 164 J

3) 200/4 = 50J/C

4) m x dT x S = m x dT x S

25 x (59-35) x 4.18 = 25 x (35-25) x 4.18

= 2508 = 1045

so difference is 1463 J

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