IB DP Chemistry Mock Exam SL Paper 1B Set 2 - 2025 Syllabus
IB DP Chemistry Mock Exam SL Paper 1B Set 2
Prepare for the IB DP Chemistry Exam with our comprehensive IB DP Chemistry Exam Mock Exam SL Paper 1B Set 2. Test your knowledge and understanding of key concepts with challenging questions covering all essential topics. Identify areas for improvement and boost your confidence for the real exam
Question
Bromine, \(Br_2\) (l), and methanoic acid, HCOOH(aq), react in the presence of sulfuric acid.
\(Br_2 (l) + HCOOH(aq) → 2HBr(aq) + CO_2 (g)\)
(a) Suggest an experimental method that could be used to determine the rate of reaction.
(b) The sulfuric acid is a catalyst in this reaction. Explain how a catalyst increases the reaction rate.
(c) Methanoic acid can react with ethanol to produce an ester. Draw the full structural formula of the organic product and state its name.
Structural formula:
Name:
(d) (i) Write the equation for the complete combustion of ethanol.
(ii) Determine the enthalpy change for the combustion of ethanol, in kJ \(mol^{−1}\), using section 11 of the data booklet.
(e) Bromine also reacts with but-2-ene.
(i) Identify the type of reaction.
(ii) Predict the structural formula of the reaction product.
(iii) Draw the structure of a section of a polymer formed from three monomers of but-2-ene.
Answer/Explanation
Answer:
(a) «measure change in»
mass
OR
pressure
OR
volume of gas/\(CO_2\) produced
OR
«intensity of» colour
OR
«electrical» conductivity
OR
pH
with time
(b) provides an alternative reaction pathway AND lower activation energy/\(E_a\)
larger fraction/number of molecules with E ≥ \(E_a\)/enough energy «for a successful
collision»
(c) Structural formula:
Name:
ethyl methanoate
(d) (i) \(CH_3CH_2OH(l) + 3O_2(g) → 2CO_2(g) + 3H_2O(g)\)
(ii) «bond breaking»
1 C-C + 5 C-H + 1 C-O + 1 O-H + 3 O=O / 346 + 5(414) + 358 + 463 +3(498) /
4731 «kJ»
«bond forming»
4 C=O + 6 O-H / 4(804) + 6(463) / 5994 «kJ»
∆H «= 4731– 5994» = −1263 «kJ \(mol^{−1}\) »
(e) (i) «electrophilic» addition/\(A_E\)
(ii) \(CH_3CHBrCHBrCH_3\)
(iii) 