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a level chemistry exam
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The chemistry exam is an exam that covers various topics in chemistry, including acid-base reactions, atomic structure, enzymes, electrolysis, and radioactivity. The exam includes multiple choice, short answer, and extended response questions that test the student's knowledge and understanding of t...

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  • January 4, 2023
  • 2
  • 2022/2023
  • Exam (elaborations)
  • Questions & answers

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1. Write the balanced chemical equation for the combustion of propane (C3H8). (5 marks)



2. Calculate the mass of oxygen required to react with 2.50g of sulfur to form sulfur dioxide
(SO2). (5 marks)



3. Write the Lewis structure for water (H2O). (5 marks)



4. Calculate the percentage yield of a reaction if the actual yield is 15.0g and the theoretical
yield is 20.0g. (5 marks)



5. Write the balanced chemical equation for the decomposition of hydrogen peroxide (H2O2)
into water and oxygen gas. (5 marks)

6. Calculate the equilibrium constant (Kc) for the following chemical reaction at 25°C:
2SO2(g) + O2(g) → 2SO3(g)

Given the following equilibrium concentrations: [SO2] = 0.40 M, [O2] = 0.40 M, [SO3] =
0.20 M. (10 marks)

7. Write the rate law expression for the following reaction: 2NO(g) + Cl2(g) → 2NOCl(g)

The rate of the reaction is found to be directly proportional to the concentration of NO
and the concentration of Cl2, and the rate is inversely proportional to the concentration of
NOCl. (10 marks)

8. Calculate the energy required to raise the temperature of 50.0g of water from 25°C to
50°C. The specific heat capacity of water is 4.184 J/g°C. (10 marks)

9. Write the structural formula for 2-methylbutane, a compound with the molecular formula
C6H14. (10 marks)

10. Predict the product of the following reaction: CH3CH2OH + H2SO4 → ?

Provide the balanced chemical equation and the structural formula of the product. (10
marks)




ANSWERS:

The balanced chemical equation for the combustion of propane (C3H8) is:
C3H8 + O2 → CO2 + H2O

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