Introduction to the particulate nature of matter

Chemia IBPaper 1A, maj 2026, TZ2wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 1

Dark crystals of iodine form on a cold glass surface placed in warm iodine vapour. No liquid is seen at any stage. What is the name of this change of state? A. Deposition B. Sublimation C. Condensation D. Freezing

Chemia IBPaper 1A, maj 2026, TZ3wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 1

Which equation represents the condensation of bromine? A. Br₂(g) → Br₂(l) B. Br₂(l) → Br₂(g) C. Br₂(l) → Br₂(s) D. Br₂(s) → Br₂(g)

Chemia IBPaper 2, maj 2026, TZ2wzorowane9 pktobliczenioweśrednie (szac.)

Zadanie 2a

Iodine crystals, I₂(s), were sealed in a flask and left until an equilibrium was reached with violet vapour above the crystals. I₂(s) ⇌ I₂(g) (i) Name the change of state from I₂(s) to I₂(g) and state the type of force between…

Chemia IBPaper 2, maj 2025, TZ1wzorowane2 pktotwartełatwe (szac.)

Zadanie 1a

Tin and iodine are elements, whereas tin(IV) iodide is a compound. Describe, with reference to these three substances, how an element differs from a compound.

Chemia IBPaper 1A, maj 2025, TZ2wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 1

A beaker contains a clear, colourless solution of potassium nitrate in water. What is the type of mixture and the best method of obtaining the solid salt from it? A. heterogeneous, by filtration B. heterogeneous, by evaporation C. homogeneous, by filtration D.…

Chemia IBPaper 1B, maj 2025, TZ3wzorowane6 pktotwarteśrednie (szac.)

Zadanie 1e

The amount of NO₂ prepared was checked by titration. The gas was first absorbed in water: 2 NO₂(g) + H₂O(l) → HNO₃(aq) + HNO₂(aq) The resulting solution was made up to 200.0 cm³ in a volumetric flask, and 20.0 cm³ portions…

• Tabela do uzupełnienia

Chemia IBPaper 1B, maj 2025, TZ1wzorowane4 pktotwarteśrednie (szac.)

Zadanie 2a

Suggest a sequence of experimental steps that would give a pure sample of each of the three components.

Chemia IBPaper 1B, maj 2025, TZ1wzorowane1 pktobliczeniowełatwe (szac.)

Zadanie 2b

The student recorded the following masses. Calculate the percentage by mass of iron and of calcium carbonate in the mixture.

• Tabela do uzupełnienia

Chemia IBPaper 1B, maj 2025, TZ1wzorowane2 pktotwarteśrednie (szac.)

Zadanie 2c

The three percentages in 2b add up to more than 100 %. Suggest an error that would explain this result and how it could be reduced or eliminated.

Chemia IBPaper 1B, maj 2025, TZ1wzorowane1 pktotwarteśrednie (szac.)

Zadanie 2d

The results did not support the student's hypothesis. Suggest what the student overlooked when forming the hypothesis.