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WorksheetsSalad Quiz 2
Total questions: 7
Worksheet time: 35mins
Name
Class
Date
1.
The decomposition of water can be represented by the chemical equation
2H2O(l)→2H2(g)+O2(g)
ΔH=+571.8 kJ/mol
From this equation, it can be concluded that the FORMATION of two moles of liquid water from gaseous hydrogen and oxygen is an
2H2O(l)→2H2(g)+O2(g)
ΔH=+571.8 kJ/mol
From this equation, it can be concluded that the FORMATION of two moles of liquid water from gaseous hydrogen and oxygen is an
a)
exothermic process releasing 571.8 kJ of heat energy
b)
exothermic process releasing 1143.6 kJ of heat energy
c)
endothermic process absorbing 571.8 kJ of heat energy
d)
endothermic process absorbing 1143.6 kJ of heat energy
2.
947 J of energy is required to raise the temperature of 125 g of stainless steel by 15.7oC. The specific heat capacity of the stainless steel, in J/g/oC, is
a)
8.41×10-3
b)
0.483
c)
7.54
d)
119
3.
A student experimentally determined the molar enthalpy of combustion of ethanol (M=46.0 g/mol) using the equipment shown in the following simplified diagram.
The student made the following experimental measurements.
Mass of water in beaker = 100.0 g
Amount of ethanol combusted = 0.020 mol
Temperature rise of the water = 40.0oC
The molar enthalpy of combustion of ethanol calculated from the student's results is
The student made the following experimental measurements.
Mass of water in beaker = 100.0 g
Amount of ethanol combusted = 0.020 mol
Temperature rise of the water = 40.0oC
The molar enthalpy of combustion of ethanol calculated from the student's results is
a)
-16.7 kJ/mol
b)
-18.2 kJ/mol
c)
-334 kJ/mol
d)
-836 kJ/mol
4.
1.30 g of glucose (M=180 g/mol) underwent complete combustion. The energy released was used to heat an unknown mass of water. If the temperature of the water increased by 24.3oC and it is assumed no heat was lost, the mass of the water heated was
a)
2.00 × 10-1 g
b)
1.02 × 102 g
c)
2.00 × 102 g
d)
3.84 × 103 g
5.
Consider the following energy profile diagram for a reaction represented by the equation X+Y→Z
Which one of the following provides the correct values of the activation energy and enthalpy for the reaction X+Y→Z?
Which one of the following provides the correct values of the activation energy and enthalpy for the reaction X+Y→Z?
a)
Activation Energy =+75 kJ/mol; Enthalpy = +100 kJ/mol
b)
Activation Energy =+100 kJ/mol; Enthalpy = +175 kJ/mol
c)
Activation Energy =+175 kJ/mol; Enthalpy = +100 kJ/mol
d)
Activation Energy =+200 kJ/mol; Enthalpy = -125 kJ/mol
6.
A water bath to be used in the study of reactions at body temperature (37°C) is prepared by mixing hot tap water (75°C) with 80.0 g of cold water (19°C). The mass of hot water which must be added to the cold water to achieve this required water bath temperature is closest to
a)
20 g
b)
30 g
c)
40 g
d)
50 g
7.
Potassium hydroxide and hydrochloric acid react in aqueous solution according to the following equation.
KOH(aq)+HCl(aq)→KCl(aq)+H2O(l)
A 50mL solution containing 0.025 mol of KOH was mixed rapidly in an insulated vessel with a 50 mL solution containing 0.025 mol of HCl. The temperature increased by 3.5oC.
Assuming that the specific heat capacity of the solution is the same as that of water, the enthalpy change, ΔH, of this reaction, in kJ/mol, is closest to
KOH(aq)+HCl(aq)→KCl(aq)+H2O(l)
A 50mL solution containing 0.025 mol of KOH was mixed rapidly in an insulated vessel with a 50 mL solution containing 0.025 mol of HCl. The temperature increased by 3.5oC.
Assuming that the specific heat capacity of the solution is the same as that of water, the enthalpy change, ΔH, of this reaction, in kJ/mol, is closest to
a)
-29
b)
-59
c)
-2.9×104
d)
-5.9×104
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