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WorksheetsCHECC481
Total questions: 25
Worksheet time: 1hrs 15mins
How many joules are equivalent to 1.50 x 103 calories?
1.50 x 106 J
3.59 x 102 J
6.28 x 103 J
6.28 x 106 J
If the same amount of energy in the form of heat is added to 5.00 g samples of each of the metals below, which metal will undergo the largest temperature change?
Ag
Cu
Hg
Fe
Aluminum has a specific heat of 0.902 J/g×°C. How many joules of heat are required to change the temperature of 8.50 grams of aluminum from 25.0°C to 93.4°C?
7.67 J
524 J
71.7 J
192 J
If 50.0 g of benzene, C6H6, at 25.0°C absorbs 2.71 kJ of energy in the form of heat, what is the final temperature of the benzene? The specific heat of benzene is 1.72 J/g×°C.
32.3°C
31.5°C
57.3°C
56.5°C
Copper has a specific heat of 0.382 J/g×°C. The temperature of an unknown mass of copper increases by 4.50°C when it absorbs 3.97 J of heat. What is the mass of the copper?
2.31 g
4.90 g
6.82 g
8.85 g
The heat capacity of 5.00 grams of iron is 2.23 J/°C. How much heat is required to change the temperature of the iron by 50.0°C?
612 J
112 J
558 J
22.3 J
Water has a specific heat of 4.18 J/g×°C. If 35.0 g of water at 98.8°C loses 4.94 kJ of heat, what is the final temperature of the water?
46.2°C
47.2°C
57.2°C
65.0°C
When 66.0 g of an unknown metal at 28.5°C is placed in 83.0 g H2O at 78.5°C, the water temperature decreases to 75.9°C. What is the specific heat capacity of the metal? The specific heat capacity of water is 4.184 J/g×°C.
0.69 J/g×°C
0.18 J/g×°C
0.055 J/g×°C
0.29 J/g×°C
A coffee-cup calorimeter contains 50.0 g of water at 60.51°C. A 12.4 g piece of graphite at 24.21°C is placed in the calorimeter. The final temperature of the water and the carbon is 59.02°C. Calculate the specific heat of carbon. The specific heat of water is 4.18 J/g×°C.
0.328 J/g×°C
0.639 J/g×°C
0.692 J/g×°C
0.721 J/g×°C
A coffee-cup calorimeter contains 10.0 g of water at 59.00°C. If 3.00 g gold at 15.20°C is placed in the calorimeter, what is the final temperature of the water in the calorimeter? The specific heat of water is 4.18 J/g×°C; the specific heat of gold is 0.128 J/g×°C.
55.37°C
58.60°C
59.40°C
60.80°C
When 1.75 g of CaCl2 dissolves in 125 g of water in a coffee-cup calorimeter, the temperature increases by 2.44°C. What is the heat change per mole of CaCl2 dissolved in water? Assume that all the heat is absorbed by the water (c = 4.18 J/g×°C).
-11.3 kJ
-728 J
-80.9 kJ
-91.9 kJ
A chemical reaction in a bomb calorimeter evolves 3.15 kJ of heat. If the temperature of the calorimeter is raised from 19.19°C to 22.03°C, what is the heat capacity of the calorimeter?
1.11 kJ/°C
2.01 kJ/°C
8.95 kJ/°C
14.5 kJ/°C
The combustion of benzoic acid, C7H6O2, can be used to determine the heat capacity of a bomb calorimeter. The heat evolved per mole of benzoic acid combusted is 3.09 ´ 103 kJ. If the combustion of 1.000 g of benzoic acid increases the temperature of a calorimeter by 7.53°C. What is the heat capacity of the calorimeter?
1.36 kJ/°C
3.36 kJ/°C
4.10 kJ/°C
51.3 kJ/°C
Acetylene, C2H2, is a gas used in welding. The molar enthalpy of combustion for acetylene is –2599 kJ. A mass of 0.338 g C2H2(g) is combusted in a bomb calorimeter. If the heat capacity of the calorimeter is 5.54 kJ/°C, what is the temperature increase of the bomb calorimeter?
1.59°C
7.01°C
6.09°C
18.0°C
Iron oxide reacts with aluminum in an exothermic reaction.
Fe2O3(s) + 2Al(s) ® 2Fe(s) + Al2O3(s)
The reaction of 5.00 g Fe2O3 with excess Al evolves 26.6 kJ of energy in the form of heat. Calculate the enthalpy change per mole of Fe2O3 reacted.
–1.33 x 102 kJ
–2.12 x 104 kJ
–2.12 x 102 kJ
–8.50 x 102 kJ
631 kJ
1262 kJ
3760 kJ
8782 kJ
–206.1 kJ
–27.3 kJ
+206.1 kJ
+27.3 kJ
-814.0 kJ
-1099.9 kJ
-2164.7 kJ
-3869.9 kJ
38.7 kJ
-1681.9 kJ
-1143.1 kJ
-824.4 kJ
All of the following statements are true EXCEPT
the molar enthalpy of formation of a compound is equal to the enthalpy change when one mole of the compound is formed from elements.
a reaction with a negative enthalpy is exothermic.
the enthalpy of formation of an element in its most stable state is equal to zero.
the sum of the enthalpies of formation of the products in a chemical reaction is defined as the enthalpy of reaction.
+30.24 kJ
-206.9 kJ
-298.6 kJ
-1398.8 kJ
-726.4 kJ
-918.0 kJ
-1452.8 kJ
-2407.6 kJ
Carbon and oxygen react to give carbon dioxide. The reaction of 4.49 g C(s) with 9.21 g O2(g) releases -113.2 kJ of heat. What is the enthalpy of formation of CO2(g)?
-393 kJ
-303 kJ
-285.8 kJ
-113.2 kJ
Calculate DE of a gas for a process in which the gas absorbs 25 J of heat and does 7 J of work by expanding.
+18 J
-18 J
-32 J
+32 J
You decide to go on a diet to lose 5 lbs (1 lb = 454 g). Fatty tissue consists of about 85% fat and 15% water. In order to lose that much weight how many Calories (kcal) must be eliminated from your normal intake? Fat contains 9.0 kcal/g.
17400 kcal
20600 kcal
3100 kcal
3500 kcal
