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WorksheetsBond Energy Practice
Total questions: 10
Worksheet time: 10mins
Breaking a chemical bond...
requires energy
releases energy
is unrelated to energy
Forming a chemical bond...
requires energy
releases energy
is unrelated to energy
An exothermic reaction...
requires energy
releases energy
is unrelated to energy
An endothermic reaction...
requires energy
releases energy
is unrelated to energy
Which bond stores the least energy per mole?
C-H
N-H
H-H
C=C
Which bond stores the most energy per mole?
C-H
N-H
H-H
C=C
The average bond enthalpies for O-O and O=O are 146 and 496 kJ/mol respectively. What is the enthalpy change, in kJ, for the reaction below?
H-O-O-H(g) → H-O-H(g) + ½O=O(g)
-102
+102
+350
+394
When the solids Ba(OH)2 and NH4SCN are mixed, a solution is produced and the temperature drops. Which statement about the energetics of this reaction is correct?
The reaction is endothermic and ΔH is negative
The reaction is endothermic and ΔH is positive
The reaction is exothermic and ΔH is negative
The reaction is exothermic and ΔH is positive
The following equation shows the formation of magnesium oxide from magnesium metal. Which statement is correct for this reaction?
2Mg(s) + O2(g) → 2MgO(s) ΔH = -1204 kJ
1204 kJ of energy are released for every mole of magnesium reacted
602 kJ of energy are absorbed for every mole of magnesium oxide formed
602 kJ of energy are released for every mole of oxygen reacted
1204 kJ of energy are released for every two moles of magnesium oxide formed
