PHYSICS CHAPTER 8 SECTION 3 Worksheet 2
NAME
1.
PERIOD
How much heat is evolved when 125 grams of lead cools from 135 degrees Celsius to 10 Co? (Answer 476.56 cal)
2.
If 35 grams of water at 5 Co is mixed with 92 grams of water at 95 Co. Determine the final temperature of the mixture.
(Answer 70.2 Co)
3.
A 0.05-kilogram ingot of metal is heated to 200 Co and then is dropped into a beaker containing 0.4 kilograms of water
initially at 20.0 Co. If the final temperature of the mixed system is 22.4 Co, find the specific heat of the metal, assuming none
of the heat escapes as steam. (Answer .108 cal/g Co)
4.
An aluminum calorimeter of mass 100 grams contains 250 grams of water. They are in thermal equilibrium at 10 Co. Two
metallic blocks are placed in the water. One is a 50-gram piece of copper at 80 Co. The other sample has a mass of 70 grams
and is originally at a temperature of 100 Co. The entire system stabilizes at a final temperature of 20 Co. Determine the
specific heat of the unknown sample.
(Answer .436 cal/gC)
5.
What is the final equilibrium temperature when 10 grams of milk at 10 Co is added to 160 grams of coffee at 90 Co? (Assume
the heat capacities of the two liquids are the same as water and neglect the heat capacity of the container.) (Answer 85.3 Co)
6.
A Styrofoam cup contains 200 grams of mercury at 0 Co. To this is added 50 grams of ethyl alcohol at 50 Co and 100 grams
of water at 100 Co. (A) What is the final temperature of the mixture? (B) How much heat was gained or lost by the mercury,
the alcohol and the water? (The specific heat of mercury is . 033 cal/gC, that of ethyl alcohol is .58 cal/gC. The heat
capacity of the Styrofoam cup is negligible).
(Answer is 84.4 degrees Celsius, Mercury gained 557.04 calories, Ethyl alcohol gained 997.6 calories, and Water lost 1560
calories)
7.
A block of brass, mass 500 grams, temperature 100 Co, is put in 300 grams of water temperature 20 Co, in an aluminum
calorimeter, mass 75 grams. If the final temperature is 30 Co, determine the specific heat of the brass.
(Answer .0904 cal/g Co)
8.
A cylinder of copper has a mass of 95.3 and a specific heat of .092 cal/g Co. It is heated to 90.5 Co and then put in 75.2
grams of turpentine, temperature 20.5 Co. The temperature of the mixture after stirring is 35.5 Co. Determine the specific
heat of the turpentine.
(Answer .428 cal/g Co)
9.
Determine the final temperature of a mixture of 117 grams of water at 24 Co in a 55-gram aluminum calorimeter and 250
grams of silver at 100 Co. (Answer 21.74Co)