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WorksheetsGEN CHEM 2 QUARTER 2 MODULE 1 POST-TEST
Total questions: 10
Worksheet time: 58mins
The thermodynamic quantity that expresses the degree of disorder in a system is ___________.
Entropy
Enthalpy
Heat flow
Internal energy
Which one of the following is always positive when a spontaneous process occurs?
ΔHuniverse
ΔSuniverse
ΔHsurroundings
ΔSsurroundings
ΔS will be positive for the reaction ____________________.
CO2(g) --> CO2(s)
2NO2(s) --> N2O4(g)
2H2(s) + O2(g) --> 2H2O(g)
BaF2(s) --> Ba+2(aq) + 2F-(aq)
Given the following thermodynamic quantities at 298.15 K (25 oC), answer the following question.
The value of for the catalytic hydrogenation of acetylene to ethene, C2H2(g) + H2(g) --> C2H4(g) is ____________ J/K.
-18.6
+18.6
+112.0
-112.0
Which of the following changes is ruled by the tendency of particles to become more disordered?
Cooling of the hot frying pan
Dissolving of sugar in water
The condensation of water vapor to rain
The reaction of iron with oxygen to produce rust
Given the following thermodynamic quantities at 298.15 K (25 oC), answer the following question.
The value of for the oxidation of solid elemental sulfur to gaseous sulfur trioxide, 2S(s,rhombic) + 3O2(g) --> 2SO3(g) is ____________kJ.
-790.4
-395.2
+395.2
+790.4
Given the following thermodynamic quantities at 298.15 K (25 oC), answer the following question.
The value of for the formation of POCl3 from its constituent elements, P2(g) + O2(g) + 3Cl2(g) --> 2POCl3(g) is ____________kJ.
-1109
+1109
-606.2
+606.2
1. For the reaction, C2H6(g) --> C2H4(g) + H2(g), ΔHo=+137 kJ and ΔSo=120 J/K. This reaction is _______.
spontaneous at all temperatures
nonspontaneous at all temperatures
spontaneous only at high temperatures
nonspontaneous only at high temperatures
1. A reaction that is not spontaneous at low temperature can become spontaneous at high temperature if ΔH is _______ and ΔS is ________.
+,+
-,-
+,-
-,+
A reaction that is not spontaneous at low temperature can become spontaneous at high temperature if ΔH is _______ and ΔS is ________.
+,+
-,-
+.-
-,+
