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STRAIGHTERLINE CHEMISTRY QUESTIONS WITH ACCURATE ANSWERS
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STRAIGHTERLINE CHEMISTRY QUESTIONS WITHACCURATE ANSWERS
An endothermic reaction causes the surroundings to:
A. warm up
B. become acidic
C. condense
D. decrease in temperature
E. release CO2 Accurate Answer - D
An exothermic reaction causes the surroundings to:
A. warm up
B. become acidic
C. expand
D. decrease its temperature
E. release CO2 Accurate 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
C. 329 J
D. 7.51 kJ
E. 10.5 kJ Accurate Answer - D
Calculate the amount of heat necessary to raise the temperature of 12.0 kg of
water from 15.4oC to 93.0oC.
A. 0.027 kJ B. 324 kJ C. 389 kJ D. 931 kJ
E. 3890 kJ Accurate Answer - E
How much heat is required to raise the temperature of 1500 g of water from
25oC
to 52oC?
A. 1500 kJ B. 169 kJ C. 6.27 kJ D. 40.5 J E. 40.5 kJ Accurate 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.
A. 0.44oC B. 22.5oC C. 225oC D. 360oC E. 444oC Accurate Answer - E
If 325 g of water at 4.2oC absorbs 12.28 kJ, then what is the final temperature
of the water?
A. 4.21oC B. 4.8oC C. 9.0oC D. 13.2oC E. 2938oC Accurate 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?
A. 0.013oC B. 4oC C. 6oC D. 14oC E. 34oC Accurate 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?
A. 0.385 J/g•oC B. 1.83 ´ 104 J/g•oC C. 2.60 J/g•oC D. 1.32 J/g•oC
E. 24.5 J/g•oC Accurate 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)?
A. 0.039 J/mol•oC
B. 0.129 J/mol•oC
C. 25.4 J/mol•oC
D. 39.0 kJ/mol•oC
E. 197 J/mol•oC Accurate 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.
A. 15.87 kJ/oC
B. 4.18 kJ/oC
C. 5.52 kJ/oC
D. 1.34 kJ/oC
E. 752.1 kJ/oC Accurate 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?
A. 32.9 kJ/oC
B. 7.8 kJ/oC
C. 1.76 kJ/oC
D. 1.76 kJ/oC
E. 15.3 kJ/oC Accurate Answer - C
Which of the following processes is endothermic?
a. O2(g) + 2H2(g) 2H2O(g)
b. H2O(g) H2O(l)
c. 3O2(g) + 2CH3OH(g) 2CO2(g) + 2H2O(g)
d. H2O(s) H2O(l) Accurate Answer - D
A 100 mL sample of 0.200 M aqueous hydrochloric acid is added to 100 mL of
0.200 M aqueous ammonia in a calorimeter whose heat capacity is 480 J K ─ 1.
The following reaction occurs when the two solutions are mixed.
HCl(aq) + NH3(aq) NH4Cl(aq)
The temperature increase is 2.34oC. Calculate ΔH per mole of HCl neutralized.
A. 154 kJ B. 44.5 kJ C. 22.5 kJ D. ─22.5 kJ E. ─56.2 kJ Accurate Answer -
E
A 0.1326 g sample of magnesium was burned in an oxygen bomb calorimeter.
The Htotal heat capacity of the calorimeter plus water was 5760 J/oC. If the
temperature rise of the calorimeter with water was 0.570oC, calculate the
enthalpy of combustion of magnesium.
Mg(s) + 1/2O2(g) MgO(s)
A. ─3280 kJ/mol B. ─24.8 kJ/mol C. 435 kJ/mol
D. 106 kJ/mol E. ─602 kJ/mol Accurate Answer - E
Which one of the following reactions occurring at 25oC does the symbol
ΔHof[H2SO4(l)] refer to?
A. 2H(g) + S(g) + 4O(g) H2SO4(l)
B. H2(g) + S(g) + 2O2(g) H2SO4(l)
C. H2SO4(l) H2(g) + S(s) + 2O2(g)
D. H2SO4(l) 2H(g) + S(s) + 4O(g)
E. H2(g) + S(s) + 2O2(g) H2SO4(l) Accurate Answer - E
, Which one of the following reactions occurring at 25oC does the symbol
ΔHof[HNO3(l)] refer to?
A. H(g) + N(g) + O3(g) HNO3(l)
B. 1/2H2(g) + 1/2N2(g) + 3/2O2(g) HNO3(l)
C. HNO3(l) 1/2H2(g) + 1/2N2(g) + 3/2O2(g)
D. HNO3(l) H(g) + N(g) + 3O(g)
E. H2(g) + N2(g) + O3(g) HNO3(l) Accurate Answer - B
When 0.56 g of Na(s) react with excess F2(g) to form NaF(s) at standard state
conditions, 13.8 kJ of heat
are evolved. What is the standard enthalpy of formation (ΔHof) of NaF(s)?
A. 24.8 kJ/mol B. +570 kJ/mol C. ─24.8 kJ/mol D. ─7.8 kJ/mol
E. ─570 kJ/mol Accurate Answer - E
Ethanol undergoes combustion according to the equation:
C2H5OH(l) + O2(g) CO2(g) + H2O(l) (Not Balanced)
The standard heat of combustion of ethanol, C2H5OH(l), is ─1366.8 kJ/mol.
Given that:
ΔHof[CO2(g)] = ─393.5 kJ/mol
ΔHof[H2O(l)] = ─285.8 kJ/mol
What is the standard enthalpy of formation of ethanol?
A. 3010 kJ
B. ─687.6 kJ
C. ─277.6 kJ
D. 687.6 kJ
E. 1367 kJ Accurate Answer - C
Find the standard enthalpy of formation of ethylene, C2H4(g), given the
following data:
C2H4(g) + 3O2(g) 2CO2(g) + 2H2O(l) ΔHof = ─1411 kJ
C(s) + O2(g) CO2(g) ΔHof = ─393.5 kJ
H2(g) + 1/2O2(g) H2O(l) ΔHof = ─285.8 kJ
A. 52 kJ
B. 87 kJ
C. 731 kJ
D. 1.41 103 kJ
E. 2.77 103 kJ Accurate Answer - A
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