Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

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12 questions

SA-AC-EN-0011 markL1 FoundationCalculatorDefinitions

The standard enthalpy change of formation of an element in its standard state is

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SA-AC-EN-0081 markL1 FoundationCalculatorDefinitions

Standard conditions are

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SA-AC-EN-0121 markL1 FoundationCalculatorDefinitions

The standard enthalpy of combustion refers to burning

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SA-AC-EN-0021 markL2 StandardCalculatorDefinitions

Which equation represents

\Delta_fH^\ominus

of water?

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SA-AC-EN-0033 marksL2 StandardCalculatorCalorimetry

Burning

0.0100

mol of a fuel heats

200

g of water by

28.5\,^\circ

C. Calculate

\Delta_cH

in kJ mol⁻¹. (

c=4.18

)

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SA-AC-EN-0042 marksL2 StandardCalculatorHess's law

Calculate

\Delta_rH

for

\mathrm{C_2H_4(g)+H_2(g)\rightarrow C_2H_6(g)}

\Delta_fH

: C₂H₄ +52, C₂H₆ −84 kJ mol⁻¹.

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SA-AC-EN-0063 marksL2 StandardCalculatorHess's law

Use bond enthalpies to find

\Delta H

for

\mathrm{H_2+Cl_2\rightarrow2HCl}

. H–H 436, Cl–Cl 243, H–Cl 432 kJ mol⁻¹.

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SA-AC-EN-0071 markL2 StandardCalculatorHess's law

Values from mean bond enthalpies differ from Hess's law values because

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SA-AC-EN-0101 markL2 StandardCalculatorCalorimetry

Experimental enthalpies of combustion from a spirit burner are usually less exothermic than data-book values mainly because

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SA-AC-EN-0053 marksL3 ExamCalculatorHess's law

Calculate

\Delta_fH

of ethanol:

\mathrm{2C+3H_2+\frac12O_2\rightarrow C_2H_5OH}

\Delta_cH

: C −394, H₂ −286, C₂H₅OH −1367 kJ mol⁻¹.

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SA-AC-EN-0093 marksL3 ExamCalculatorCalorimetry

50.0\ \text{cm}^3

1.00

mol dm⁻³ HCl and

50.0\ \text{cm}^3

1.00

mol dm⁻³ NaOH rise by

6.8\,^\circ

C. Calculate

\Delta_{\text{neut}}H

in kJ mol⁻¹. (

c=4.18

, solution density 1.00 g cm⁻³)

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SA-AC-EN-0111 markL3 ExamCalculatorHess's law

Hess's law is a consequence of

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