www.usatestprep.com/modules/test/tq.php?testid%=D983&strandid 4935&element=Bidifficulty assessment&assignmen 11 Combustion Reaction Energy from Bond Energies CH + 02 --> CO2 + 2 H20 + heat energy +3000 C 4H 40 Breek 2 0-0 bonds 988 kj Form 2 C-0 bonds -1598 kj +2000- C+ 4H 2 02 CO2 + 4H 20 Break +1000- 4 C-H Form 4 0-H bonds -1836 kj bonds +1644 kj CH+ 2 0, (Reactants) Net Energy Change -802 kj CO2 • 2 H20 (Products) -1000 Study the graph above. Which statement best describes the reaction energy of the reactants and products? This is an exothermic reaction. The net energy change is -802 kJ indicating a release of energy. This is an endothermic reaction. The net energy change is -802 kJ indicating a requirement of energy. This is an endothermic reaction. Since breaking the four Carbon and Hydrogen bonds requires 1,644 kl of energy and forming the two Carbon Oxygen double bonds release -1598 kl of energy, there is a net gain of energy between the Carbon atoms. This is an exothermic reaction. Since breaking the oxygen double bond requires 988 kl of energy and forming the double bond between Cand O releases -1598 kl of energy, there is a net release of energy between the double bonds broken and formed.
www.usatestprep.com/modules/test/tq.php?testid%=D983&strandid 4935&element=Bidifficulty assessment&assignmen 11 Combustion Reaction Energy from Bond Energies CH + 02 --> CO2 + 2 H20 + heat energy +3000 C 4H 40 Breek 2 0-0 bonds 988 kj Form 2 C-0 bonds -1598 kj +2000- C+ 4H 2 02 CO2 + 4H 20 Break +1000- 4 C-H Form 4 0-H bonds -1836 kj bonds +1644 kj CH+ 2 0, (Reactants) Net Energy Change -802 kj CO2 • 2 H20 (Products) -1000 Study the graph above. Which statement best describes the reaction energy of the reactants and products? This is an exothermic reaction. The net energy change is -802 kJ indicating a release of energy. This is an endothermic reaction. The net energy change is -802 kJ indicating a requirement of energy. This is an endothermic reaction. Since breaking the four Carbon and Hydrogen bonds requires 1,644 kl of energy and forming the two Carbon Oxygen double bonds release -1598 kl of energy, there is a net gain of energy between the Carbon atoms. This is an exothermic reaction. Since breaking the oxygen double bond requires 988 kl of energy and forming the double bond between Cand O releases -1598 kl of energy, there is a net release of energy between the double bonds broken and formed.
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Study the graph. Which statement best describes the reaction energy of the reactants and products?
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Combustion Reaction Energy from Bond Energies
--> CO2 + 2 H20 + heat energy
CH4 + 02
+3000 -
C+ 4H +40
Break 2 0=0
bonds
988 kj
Form 2 C=0 bonds
-1598 kj
+2000 -
C + 4H + 2 02
Co, + 4 H 20
Break
+1000-
4 C-H
Form 4 0-H-
bonds
+1644 kj
bonds
-1836 kj
CH, + 2 02 (Reactants)
Net Energy Change
-802 kj
CO, + 2 H20 (Products)
-1000
Study the graph above. Which statement best describes the reaction energy of the reactants and products?
This is an exothermic reaction. The net energy change is -802 kl indicating
a release of energy.
A)
This is an endothermic reaction. The net energy change is -802 kJ
indicating a requirement of energy.
B)
This is an endothermic reaction. Since breaking the four Carbon and
Hydrogen bonds requires 1,644 kJ of energy and forming the two Carbon
Oxygen double bonds release -1598 kJ of energy, there is a net gain of
energy between the Carbon atoms.
C)
This is an exothermic reaction. Since breaking the oxygen double bond
requires 988 kJ of energy and forming the double bond between C and O
releases -1598 kJ of energy, there is a net release of energy between the
double bonds broken and formed.
D)
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