WorksheetsHess's Law
Total questions: 9
Worksheet time: 4mins
Which of the following reactions enthalpy change cannot be directly measured
Formation of methane
Formation of carbon monoxide
Complete combustion of carbon
Combustion of methane
How would you determine the enthalpy change in a reaction?
Eh = cmΔT and ΔH = Ehn
Eh = cmΔ/T and ΔH = Ehn
Eh = cmΔT and ΔH = Eh/n
Eh = cmΔT and ΔH = Eh/T
If the formation of methane is 1500 and the combustion of methane is 1300 and the enthalpy of combustion of carbon is 40, what is the enthalpy of the combustion of hydrogen?
2840
160
140
40
Hess's Law states that...
all reactions are reversible
the enthalpy change of a reaction is independent of the route taken
the direct route results in a greater enthalpy change
the indirect route results in a lower enthalpy change as energy is lost in the second step
ΔH value in an exothermic reaction is a negative number.
True
False
What symbol represents Enthalpy change?
ΔH
ΔT
ΔG
ΔS
You are given these two equations:
2H2 + O2 → 2H2O ∆H = -572 kJ
H2 + O2 → H2O2 ∆H = -188 kJ
