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STRAIGHTERLINE CHEMISTRY FINAL
EXAM VERSION 2 LATEST 2024 WITH 450
QUESTIONS AND CORRECT VERIFIED
ANSWERS/ STRAIGH ERTLINE CHEMISTRY
FINAL EXAM 2024/2025 (NEW!!)
For the reaction:
C(s) + O2(g) CO2(g) ΔHof = ─393 kJ How many grams of C(s) must be burned to release 275 kJ of heat?
- 22.3 g B. 0.70 g C. 12.0 g D. 17.1 g E. 8.40 g - ANSWER-E
The combustion of butane produces heat according to the equation:
2C4H10(g) + 13O2(g) 8CO2(g) + 10H2O(l) ΔHorxn = ─5,314 kJ What is the heat of combustion per gram of butane?
- -32.5 kJ B. -45.7 kJ C. -91.5 kJ D. -2,656 kJ E. -15,440 kJ - ANSWER-B
The combustion of octane produces heat according to the equation:
2C8H18(l) + 25O2(g) 16CO2(g) + 18H2O(l) ΔHorxn= ─11,020 kJ What is the heat of combustion per gram of octane?
- 5.510 MJ B. 96.5 kJ C. 48.2 kJ D. 193 kJ E. 629.2 MJ - ANSWER-C
The combustion of butane produces heat according to the equation:
2C4H10(g) + 13O2(g) 8CO2(g) + 10H2O(l) ΔHorxn= ─5314 kJ How many grams of butane must be burned to release 6375 kJ of heat?
- 1.20 g B. 139 g C. 0.0413 g D. 69.7 g E. 97.8 g - ANSWER-B 1 / 4
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Given the following information:
CaO(s) + H2O(l) Ca(OH)2(s) ΔHorxn = ─64.8 kJ/mol How many grams of CaO must react in order to liberate 525 kJ of heat?
- 6.92 g B. 56.1 g C. 455 g D. 606 g E. 3.40 104 g - ANSWER-C
An endothermic reaction causes the surroundings to:
- warm up
- become acidic
- condense
- decrease in temperature
- release CO2 - ANSWER-D
An exothermic reaction causes the surroundings to:
- warm up
- become acidic
- expand
- decrease its temperature
- release CO2 - ANSWER-A
Copper metal has a specific heat of 0.385 J/g•oC and has a melting point of 1083oC.calculate the amount of heat required to raise the temperature of 22.8 g of Cu from 20.0oC to 875oC.
A. 1.97 10 ─ 5 J
B. 1.0 10 ─ 2 J 2 / 4
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C. 329 J
- 7.51 kJ
- 10.5 kJ - ANSWER-D
Calculate the amount of heat necessary to raise the temperature of 12.0 kg of water from 15.4oC to 93.0oC.
- 0.027 kJ B. 324 kJ C. 389 kJ D. 931 kJ
- 3890 kJ - ANSWER-E
How much heat is required to raise the temperature of 1500 g of water from 25oC to 52oC?
- 1500 kJ B. 169 kJ C. 6.27 kJ D. 40.5 J E. 40.5 kJ - ANSWER-B
How many degrees of temperature rise will occur when a 25.0 g block of aluminum absorbs 10 kJ of heat? The specific heat of Al is 0.900 J/g•oC.
- 0.44oC B. 22.5oC C. 225oC D. 360oC E. 444oC - ANSWER-E
If 325 g of water at 4.2oC absorbs 12.28 kJ, then what is the final temperature of the water?
- 4.21oC B. 4.8oC C. 9.0oC D. 13.2oC E. 2938oC - ANSWER-D
A glass containing 200 g of H2O at 20oC was placed into a refrigerator. The water loses 11.7 kJ as it cools to a constant temperature. What is its new temperature?
- 0.013oC B. 4oC C. 6oC D. 14oC E. 34oC - ANSWER-C
A piece of copper with a mass of 218 g has a heat capacity of 83.9 J/oC. What is the specific heat of copper? 3 / 4
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- 0.385 J/g•oC B. 1.83 ´ 104 J/g•oC C. 2.60 J/g•oC D. 1.32 J/g•oC
- 24.5 J/g•oC - ANSWER-A
The specific heat of gold is 0.129 J/g•oC. What is the molar heat capacity of gold (unit is J/mol•oC)?
- 0.039 J/mol•oC
- 0.129 J/mol•oC
- 25.4 J/mol•oC
- 39.0 kJ/mol•oC
- 197 J/mol•oC - ANSWER-C
When 0.7521 g of benzoic acid was burned in a calorimeter containing 1000 g of water, a temperature rise of 3.60oC was observed. What is the heat capacity of the bomb calorimeter, excluding water? The heat of combustion of benzoic acid is ─26.42 kJ/g.
- 15.87 kJ/oC
- 4.18 kJ/oC
- 5.52 kJ/oC
- 1.34 kJ/oC
- 752.1 kJ/oC - ANSWER-D
Naphthalene combustion can be used to determine the heat capacity of a bomb calorimeter. The heat of combustion of naphthalene is 40.1 kJ/g. When 0.8210 g of naphthalene was combusted in a calorimeter containing 1000 g of water a temperature rise of 4.21oC was observed. What is the heat capacity of the bomb calorimeter excluding the water?
- 32.9 kJ/oC
- 7.8 kJ/oC
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