NEW
Font size
WorksheetsEnthalpy of rxn and Hess's Law
Total questions: 15
Worksheet time: 33mins
What type of reaction is shown in the graph?
endothermic reaction
exothermic reaction
H2 + ½ O2 --> H2O + 285 kJ
is an example of a(n)
Electrical equation
Heat equation
Thermochemical equation
C+ O2 --> CO2 + 60kJ
what is the ΔH for the reaction?
+60
-60
there is no way to know
How do you calculate Enthalpy of a reaction?
ΔH = ΔHproducts - ΔHreactants
ΔT = q / mC
ΔG = ΔH -TΔS
E = mc2
What is the Change in Enthalpy of Reaction for the decomposition of Sodium Bicarbonate?
NaHCO3(s) → Na2CO3(s) + H2O(g) + CO2(g)
129.18 kJ/mol
-818.52 kJ/mol
-947.7 kJ/mol
-1130.9 kJ/mol
What is the Change in Enthalpy of Reaction for the Formation of Sodium Chloride?
Na(s) + Cl2(g) → NaCl(s)
-821.8 kJ/mol
-818.52 kJ/mol
-410.9 kJ/mol
-113.9 kJ/mol
Did you hear about the man who got cooled to absolute zero?
He's 0K now.
He dead.
Can't Happen!
Yep... another science pun I don't understand
What does letter W represent?
Energy of reactants in the forward reaction
Activation energy of forward reaction
Energy of products in the forward reaction
Enthalpy of the forward reaction
What does letter T represent?
Energy of reactants in the forward reaction
Activation energy of forward reaction
Energy of products in the forward reaction
Enthalpy of the forward reaction
What does letter C represent?
Energy of reactants in the forward reaction
Activation energy of forward reaction
Reactants
Activated complex
Is this reaction endothermic or exothermic?
The reaction is exothermic because energy of the products is less than energy of the reactants
The reaction is exothermic because energy of the products is more than energy of the reactants
The reaction is endothermic because energy of the products is less than energy of the reactants
The reaction is endothermic because energy of the products is more than energy of the reactants
The enthalpies of combustion of C(s), H2(g) and C4H9OH(l) (in kJmol-1) are as follows
C(s) + O2(g) -> CO2(g) ∆H=a
H2(g) + ½O2(g) -> H2O(l) ∆H=b
C4H9OH(l) + 6O2(g) -> 4CO2(g) + 5H2O(l) ∆H=c
What is the enthalpy change for the reaction shown below?
4C(g) + 5H2(l) + ½O2(g) -> C4H9OH(l)
c – 4a – 5b
4a + 5b - c
2a + 10b - c
2a + 5b + c
The standard enthalpy changes of combustion of carbon, hydrogen and methane are shown in the table.
Which one of the following expressions gives the correct value for the standard enthalpy change of formation of methane in kJ mol–1?
C(s) + 2H2(g) → CH4(g)
394 + (2 × 286) – 891
–394 – (2 × 286) + 891
394 + 286 – 891
–394 – 286 + 891
You are given these two equations:
2H2 + O2 → 2H2O ∆H = -572 kJ
H2 + O2 → H2O2 ∆H = -188 kJ
