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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-OC-EN-0011 markL1 FoundationCalculatorExo and endo
In an exothermic reaction, the temperature of the surroundings
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Salam Academy Original Practice · Proposed mark scheme
SA-OC-EN-0021 markL1 FoundationCalculatorExo and endo
Which is endothermic?
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Salam Academy Original Practice · Proposed mark scheme
SA-OC-EN-0031 markL1 FoundationCalculatorExo and endo
For an exothermic reaction, ΔH\Delta H is
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Salam Academy Original Practice · Proposed mark scheme
SA-OC-EN-0121 markL1 FoundationCalculatorExo and endo
Which of these is exothermic?
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Salam Academy Original Practice · Proposed mark scheme
SA-OC-EN-0041 markL2 StandardCalculatorBond energies
Bond breaking is
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Salam Academy Original Practice · Proposed mark scheme
SA-OC-EN-0051 markL2 StandardCalculatorExo and endo
Activation energy is
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Salam Academy Original Practice · Proposed mark scheme
SA-OC-EN-0062 marksL2 StandardCalculatorCalorimetry
5050 g of water is heated from 20 ∘C20\,^\circ\mathrm{C} to 40 ∘C40\,^\circ\mathrm{C}. Calculate the energy transferred in joules. (c=4.2 J/g/∘Cc=4.2\ \mathrm{J/g/^\circ C})

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Salam Academy Original Practice · Proposed mark scheme
SA-OC-EN-0091 markL2 StandardCalculatorExo and endo
On an energy profile for an endothermic reaction, the products are
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Salam Academy Original Practice · Proposed mark scheme
SA-OC-EN-0101 markL2 StandardCalculatorExo and endo
A catalyst affects the energy profile by
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Salam Academy Original Practice · Proposed mark scheme
SA-OC-EN-0073 marksL3 ExamCalculatorBond energies
H2+Cl2→2HCl\mathrm{H_2+Cl_2\rightarrow2HCl}. Bond energies (kJ/mol): H–H 436, Cl–Cl 242, H–Cl 431. Calculate ΔH\Delta H in kJ/mol.

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Salam Academy Original Practice · Proposed mark scheme
SA-OC-EN-0083 marksL3 ExamCalculatorBond energies
CH4+2O2→CO2+2H2O\mathrm{CH_4+2O_2\rightarrow CO_2+2H_2O}. Bond energies (kJ/mol): C–H 413, O=O 498, C=O 805, O–H 464. Calculate ΔH\Delta H.

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Salam Academy Original Practice · Proposed mark scheme
SA-OC-EN-0113 marksL3 ExamCalculatorCalorimetry
Neutralising 0.0500.050 mol of acid warms 100100 g of solution by 6.5 ∘C6.5\,^\circ\mathrm{C}. Calculate ΔH\Delta H in kJ/mol. (c=4.2c=4.2)

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Salam Academy Original Practice · Proposed mark scheme