CHEM 151 RIO SALADO
MIDTERM EXAM
How much heat, in calories, must be added to a 75.0 g iron block with
a specific heat of 0.449 J/g °C to increase its temperature from 25 °C
to its melting temperature of 1535 °C? - ANSWERS-1.21 x 10^4 cal
How much would the temperature of 200.0 g of water increase if 36.5
kJ of heat were added? - ANSWERS-43.6°C
An aluminum kettle weighs 1.05 kg. How much heat in joules is
required to increase the temperature of this kettle from 23.0 °C to 99.0
°C? - ANSWERS-7.2 x 10^4 J
A 45g aluminum spoon (specific heat 0.88 J/g°C) at 24 °C is placed in
180 mL (180g) of coffee at 85 °C and the temperature of the two
become equal. What is the final temperature when the two become
equal? Assume that coffee has the same specific heat as water. -
ANSWERS-82°C
A 70.0 g piece of metal at 80.0 °C is placed in 100 g of water at 22.0
°C contained in a calorimeter like that shown in Figure 3 Section 5.2
of your textbook. The metal and water come to the same temperature
at 24.6 °C. What is the specific heat of the metal? - ANSWERS-0.28
J/g°C
, - ANSWERS-Endothermic
When 50.0 g of 0.200 M NaCl(aq) at 24.1 °C is added to 100.0 g of
0.100 M AgNO3 (aq) at 24.1 °C in a calorimeter, the temperature
increases to 25.2 °C as AgCl(s) forms. Assuming the specific heat of
the solution and products is 4.20 J/g °C, calculate the approximate
amount of heat in joules produced. - ANSWERS-693 J
When 1.0 g of fructose, C6H12O6 (s), a sugar commonly found in
fruits, is burned in oxygen in a bomb calorimeter, the temperature of
the calorimeter increases by 1.58 °C. If the heat capacity of the
calorimeter and its contents is 9.90 kJ/°C, what is q for this
combustion? - ANSWERS-15.6 kJ
A pint of premium ice cream can contain 1100 Calories. What mass of
fat, in grams, must be produced in the body to store an extra 1.1 x 103
Calories if the average number of calories for fat is 9.1 Calories/g? -
ANSWERS-120 g
Which of the following is considered a state function? - ANSWERS-
Ice
How much heat is produced by combustion of 125 g of methanol
under standard state conditions? (Use the Standard Molar Enthalpies
of Combustion table in Section 5.3 in your textbook) - ANSWERS-
2.83 x 10^3 kJ
MIDTERM EXAM
How much heat, in calories, must be added to a 75.0 g iron block with
a specific heat of 0.449 J/g °C to increase its temperature from 25 °C
to its melting temperature of 1535 °C? - ANSWERS-1.21 x 10^4 cal
How much would the temperature of 200.0 g of water increase if 36.5
kJ of heat were added? - ANSWERS-43.6°C
An aluminum kettle weighs 1.05 kg. How much heat in joules is
required to increase the temperature of this kettle from 23.0 °C to 99.0
°C? - ANSWERS-7.2 x 10^4 J
A 45g aluminum spoon (specific heat 0.88 J/g°C) at 24 °C is placed in
180 mL (180g) of coffee at 85 °C and the temperature of the two
become equal. What is the final temperature when the two become
equal? Assume that coffee has the same specific heat as water. -
ANSWERS-82°C
A 70.0 g piece of metal at 80.0 °C is placed in 100 g of water at 22.0
°C contained in a calorimeter like that shown in Figure 3 Section 5.2
of your textbook. The metal and water come to the same temperature
at 24.6 °C. What is the specific heat of the metal? - ANSWERS-0.28
J/g°C
, - ANSWERS-Endothermic
When 50.0 g of 0.200 M NaCl(aq) at 24.1 °C is added to 100.0 g of
0.100 M AgNO3 (aq) at 24.1 °C in a calorimeter, the temperature
increases to 25.2 °C as AgCl(s) forms. Assuming the specific heat of
the solution and products is 4.20 J/g °C, calculate the approximate
amount of heat in joules produced. - ANSWERS-693 J
When 1.0 g of fructose, C6H12O6 (s), a sugar commonly found in
fruits, is burned in oxygen in a bomb calorimeter, the temperature of
the calorimeter increases by 1.58 °C. If the heat capacity of the
calorimeter and its contents is 9.90 kJ/°C, what is q for this
combustion? - ANSWERS-15.6 kJ
A pint of premium ice cream can contain 1100 Calories. What mass of
fat, in grams, must be produced in the body to store an extra 1.1 x 103
Calories if the average number of calories for fat is 9.1 Calories/g? -
ANSWERS-120 g
Which of the following is considered a state function? - ANSWERS-
Ice
How much heat is produced by combustion of 125 g of methanol
under standard state conditions? (Use the Standard Molar Enthalpies
of Combustion table in Section 5.3 in your textbook) - ANSWERS-
2.83 x 10^3 kJ
