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WorksheetsQUIZIZZ100: Thermochemistry #3
Total questions: 11
Worksheet time: 3hrs 45mins
The enthalpy of formation of copper(II) sulphate is -767 kJ/mol.
Cu(s) + S(s) + 2O2(g) --> CuSO(s)
However, a mixture of copper powder, sulphur and oxygen gas at 25 oC and 1.0 atm does not yield any copper(II) sulphate. This is because...
the reaction is too exothermic.
copper(II) sulphate is not stable.
the activation energy is too high.
copper is not a reactive metal.
The enthalpy of combustion of ethanol is -1430 kJ/mol. How much heat energy will be given off when 1 dm3 ethanol is completely burnt? Given the density of ethanol is 0.79 g cm-3.
1430 kJ
2456 kJ
14300 kJ
24560 kJ
The standard enthalpy of combustion of 2-methyl-1-butene is -3114 kJ/mol. Which of the following compounds is expected to have the same enthalpy of combustion?
Cyclopentane
Cyclopentene
2-pentene
Methylcyclobutane
The enthalpy change represented by the equation:
MgSO4(s) --> Mg2+(aq) + SO42-(aq)
is known as...
the ionisation energy of magnesium and sulphate.
the lattice crystal energy of magnesium sulphate.
the enthalpy of solution of magnesium sulphate.
the enthalpy of hydration of magnesium sulphate.
Which of the following equation(s) will the enthalpy change correspond to an enthalpy change of formation and combustion?
C(s) + O2(g) --> CO2(g)
H2(g) + 1/2O2(g) --> H2O(l)
H2(g) + O2(g) --> H2O2(l)
100 cm3 of 0.50 mol dm-3 sodium hydroxide solution is added to 80 cm3 of 1.0 mol dm-3 hydrochloric acid in a calorimeter. If the enthalpy of neutralisation for this reaction is -57.0 kJ mol-1, calculate the change in the temperature of the solution mixture. Given; specific heat capacity of solution = 4.20 J g-1 oC-1 and density of solution = 1.0 g cm-3.
2.6 oC
3.4 oC
3.8 oC
4.2 oC
The enthalpies of formation for ethene and octane are respectively 52.3 kJ/mol and -250.0 kJ/mol. When octane was cracked, ethene and hydrogen are formed according to the equation:
C8H18(l) --> 4C2H4(g) + H2(g)
How much heat energy is required to crack 1.0 mol of octane?
-40.8 kJ
-459.2 kJ
40.8 kJ
459.2 kJ
Which of the following cannot be found in a Born-Haber cycle?
Heat of combustion
Electron affinity
Heat of formation
Heat of sublimation
Which of the following affect(s) the lattice energy of a compound?
The charge on the anion and cation
The radii of the anion and cation
The electronegativity of the ions
Why does the lattice crystal energy decreases from MgO, CaO, SrO to BaO?
The size of the cation increases
The metals become less electronegative
The compound shows increasing covalent character
Which of the following is/are true about the Born-Haber cycle?
It can be used to determine the enthalpy of hydration
It is closely related to Hess's law
It must include heat of formation of an ionic crystal
