IB DP Chemistry Mock Exam SL Paper 1B Set 3 - 2025 Syllabus
IB DP Chemistry Mock Exam SL Paper 1B Set 3
Prepare for the IB DP Chemistry Exam with our comprehensive IB DP Chemistry Exam Mock Exam SL Paper 1B Set 3. 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
Iron has three main naturally occurring isotopes which can be investigated using a mass spectrometer.
A sample of iron has the following isotopic composition by mass.
a. Calculate the relative atomic mass of iron based on this data, giving your answer to two decimal places. [2]
b .Calculate the number of electrons in the ion \(^{{\text{56}}}{\text{F}}{{\text{e}}^{2 + }}\). [1]
Answer/Explanation
Markscheme
\(\frac{{(54 \times 5.95) + (56 \times 91.88) + (57{\text{ }}2.17)}}{{100}}\);
55.90;
Award [2] for correct final answer.
Answer must be to 2 d.p.
24;
metallic (bonding);
positive ions/cations and delocalized/sea of electrons;
electrostatic attraction between the two;
Award [2 max] for description of bonding
Conductivity:
electrons delocalised/free to move;
Malleability:
atoms/ions/cations can move without breaking bonds / atoms/ions/cations can slide
past each other;