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WorksheetsTRIAL UPS CHAPTER 2: THERMOCHEMISTRY
Total questions: 20
Worksheet time: 15mins
Enthalpy combustion:
"The heat release when 1 mol of ____________ is burned completely in excess oxygen"
compound
element
substance
water
All the following would be expected to have enthalpy of formation values of zero EXCEPT.
CI2 (g)
Mg (s)
Hg (l)
CO2 (s)
Which equation represents the enthalpy change of atomisation of bromine?
Br2 (aq) → 2 Br (g)
½ Br2 (g) → Br (g)
½ Br2 (l) →Br (g)
Br2 (l) → 2Br (g)
If 2H2(g) + O2(g) → 2H2O(g) has ∆H= -241.8 kJ,
what would be the ∆H of the following?
H2O(g) → H2(g) + ½ O2(g)
-120.9 kJ
-241.8kJ
+120.9 kJ
+241.8kJ
Which of the thermochemical equation below represent the standard enthalpy of formation of water.
H2(g) + ½ O2(g) → H2O(g)
H2(g) + ½ O2(g) → H2O(l)
2H2(g) + ½ O2(g) → 2H2O(g)
2H2(g) + ½ O2(g) → 2H2O(l)
Based on this equation, for enthalpy of neutralization, 1 mol is referring to...
HCl(aq) + KOH(aq) → KCl (aq) + H2O(l)
HCl(aq)
KOH(aq)
KCl(aq)
H2O(l)
Which of the equation correct refer to definition of formation, CH3OH (g)
CH3(g) + OH(g) → CH3OH (g)
C(s) + H2(g) + OH2(g) → CH3OH (g)
C(s) + 2H2(g) + 1/2O2(g) → CH3OH (g)
C(s) + H4(g) + O(g) → CH3OH (g)
Which of equation example for the definition:
"The heat release when 1 mol of substance is burned completely in excess oxygen"
C(s) + 2H2(g) → CH4(g)
HCl(aq) + NaOH(aq) → NaCl (aq) + H2O(l)
C2H6(l) + 7/2 O2(g) → 2CO2(g) + 3H2O(l)
Cl-(g) → Cl-(aq)
Which of the following equation not the enthalpy of atomisation:
1/2Br2(l) → Br(g)
Al(l) → Al(g)
1/2Cl2(g) → Cl(g)
Mg(s) → Mg(g)
Given the enthalpy of formation NO2(g)
1/2N2(g) + O2(g) → NO2(g) ΔH = +33.0 kJ
Calculate enthalpy of combustion, N2(g)
ΔH = +16.5 kJ/mol
ΔH = +33.0 kJ/mol
ΔH = -33.18 kJ/mol
ΔH = +66.0 kJ/mol
Define enthalpy solution:
the heat absorbed when 1 mole of gaseous atoms is formed from its element
the heat released when 1 mole of gaseous ions is hydrated in water
the heat change when 1 mole of a substance is dissolves in water to form a very dilute solution
the heat change when 1 mole of a compound is formed from its elements
Which of the equation not the enthalpy of formation:
Na(s) + 1/2Br2(l) →> NaBr(s)
2Na(s) + O2(g) → Na2O(s)
Al(s) + 3/2Cl2(g) → AlCl3(s)
Mg(s) + 1/2Cl2(g) → MgCl2(s)
Lattice energy :
Energy released when 1 mole of solid ionic compound formed from its gaseous ions.
Which of the equation refer for this definition.
Na(s) + 1/2 Cl2(g) → NaCl (s)
Na+(g) + Cl-(g) → NaCl (s)
NaCl (s) → Na+(g) + Cl-(g)
Na+(aq) + Cl-(aq) → Na+Cl- (s)
Based on the diagram, choose the correct statement.
The reaction shown is exothermic
The reaction shown is endothermic
The reactant loses heat to the product
The reaction is reversible
The SI unit of heat and energy is the __________.
Celcius
Kelvin
Joule
Watt
In an endothermic reaction __________.
heat is absorbed from the surroundings causing a rise in the temperature
heat is absorbed from the surroundings causing a drop in the temperature.
heat is released to the surroundings causing a drop in the temperature
heat is released to the surroundings causing a rise in the temperature.
What is the specific heat capacity of water?
8.314 Jmol-1K-1
4.18 JK-1
2.18 J
4.18 Jg-1K-1
Lattice energy depends on:
ionic radii
value of enthalpy
size of molecule
charge of the molecule
Which of the following enthalpy changes is always exothermic?
Enthalpy of atomisation
Enthalpy of formation
Enthalpy of neutralisation
Enthalpy of solution
