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WorksheetsChem Energetics review
Total questions: 11
Worksheet time: 11mins
Which of the following chemical equations represents a standard enthalpy change of formation?
Which of the following chemical equations represents both a standard enthalpy change of formation and combustion?
S (g) + O2 (g) -> SO2 (g)
SO (g) + ½O2 (g) -> SO2 (g)
S (s) + O2 (g) -> SO2 (g)
SO2 (g) + ½O2 (g) -> SO3 (g)
Which of the following chemical equations represents a standard enthalpy change of hydration?
NaBr (s) + aq -> Na+ (aq) + Br- (aq)
Na (s) -> Na (l)
Na+ (g) + H2O -> Na+.H2O (aq)
Br- (g) + aq -> Br- (aq)
Which of the following chemical equations represents the second electron affinity of oxygen?
O2 (g) + 2e- -> 2O- (g)
O (g) + 2e- -> O2- (g)
O- (g) + e- -> O2- (g)
O+ (g) -> O2+ (g) + e-
First electron affinity of an element is usually ________ and second electron affinity is ____________.
exothermic, endothermic
exothermic, exothermic
endothermic, endothermic
endothermic, exothermic
Which of the following are true regarding enthalpy change of atomisation?
Enthalpy change of atomisation involves breaking both inter and intramolecular bonds
Enthalpy change of atomisation for F2 = 1/2 Bond energy
Enthalpy change of atomisation for I2 = 1/2 Bond energy
Enthalpy change of atomisation of N2 = 1/2 Bond energy
In the Born-Haber cycle shown, what are the enthalpy change values needed to calculate the lattice energy of MgS(s)?
Enthalpy change of formation of MgS(s)
Enthalpy change of atomisation of Mg
Enthalpy change of vaporisation of Mg
1st ionisation energy of Mg
2nd ionisation energy of Mg
From the energy level diagram shown, which of the following is/are a correct application of Hess' Law?
ΔH1 + ΔH2 + ΔH3 + ΔH4 = ΔH5
ΔH1 + ΔH5 + ΔH4 = ΔH2 + ΔH3
ΔH2 + ΔH3 + ΔH4 = ΔH1 + ΔH5
ΔH1 = ΔH2 + ΔH3 - ΔH4 - ΔH5
On a scale of 1-5, how well do you think you have mastered Chem Energetics (Enthalpy changes, not including Entropy/Gibbs Free Energy)?
1
2
3
4
5
Any other queries/comments
Do you think you need more clarifications/ practice in the following areas?
Calorimetry (mcΔT)
Calculations using bond energies
Born-Haber cycle/ Energy level diagram
Other energy cycles
Definitions
