Focus On Physical Science: California Grade 8

Chapter 8: Chemical Reactions

Math Practice

1.
What is ΔH for the reverse reaction of CH4(g) + 2O2(g) –> CO2(g) + 2H2O(l)?
A)–212.8 kJ
B)212.8 kJ
C)0 kJ
D)106.4 kJ
2.
If a reaction of C + O2 –> CO2 has a potential energy of reactants of 0 kJ and potential energy of products of –94.1 kJ, find ΔH.
A)0 kJ
B)94.1 kJ
C)–94.1 kJ
D)–47.05 kJ
3.
Is the reaction of C + O2 –> CO2, exothermic or endothermic?
A)neither
B)endothermic
C)both
D)exothermic
4.
What is ΔH for the reverse reaction of C + O2 –> CO2?
A)47.05 kJ
B)–94.1 kJ
C)0 kJ
D)94.1 kJ
5.
If a reaction of N2O5(s) –> 2NO2(g) + 1/2 O2(g) has a potential energy of reactants of kJ and potential energy of products of kJ, find ΔH.
A)13.1 kJ
B)–26.2 kJ
C)26.2 kJ
D)–13.1 kJ
6.
Is the reaction of N2O5(s) –> 2NO2(g) + 1/2 O2(g), exothermic or endothermic?
A)exothermic
B)endothermic
C)both
D)neither
7.
What is ΔH for the reverse reaction of N2O5(s) –> 2NO2(g) + 1/2 O2(g)?
A)–26.2 kJ
B)26.2 kJ
C)13.1 kJ
D)–13.1 kJ
8.
If a reaction of CH3OH(l) + 1 1/2 O2(g) –> CO2(g) + 2H2O(l) has a potential energy of reactants of –239 kJ and potential energy of products of –965 kJ, find ΔH.
A)–239 kJ
B)–726 kJ
C)–965 kJ
D)726 kJ
9.
Is the reaction of CH3OH(l) + 1 1/2 O2(g) –> CO2(g) + 2H2O(l), exothermic or endothermic?
A)both
B)endothermic
C)exothermic
D)neither
10.
What is ΔH for the reverse reaction of CH3OH(l) + 1 1/2 O2(g) –> CO2(g) + 2H2O(l)?
A)–965 kJ
B)–726 kJ
C)–239 kJ
D)726 kJ
Grade 8
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