Chemistry SL Paper 2, May 2026, TZ3

Chemia IBPaper 2, maj 2026, TZ3wzorowane5 pktotwarteśrednie (szac.)

Zadanie 1a

(i) Magnesium burns in oxygen according to the equation $\ce{Mg(s) + 1/2 O2(g) -> MgO(s)}$. Explain, using electron configurations, how ions are formed by magnesium and oxygen and how these ions form a compound. (ii) Explain, using electron configurations, why…

Chemia IBPaper 2, maj 2026, TZ3wzorowane4 pktobliczenioweśrednie (szac.)

Zadanie 1b

Potassium also forms compounds with polyatomic ions. 2 KOH(aq) + Cu(NO₃)₂(aq) → Cu(OH)₂(s) + 2 KNO₃(aq) (i) 30.0 cm³ of a 0.380 mol dm⁻³ potassium hydroxide, KOH, solution is mixed with 25.0 cm³ of a 0.310…

Chemia IBPaper 2, maj 2026, TZ3wzorowane6 pktobliczenioweśrednie (szac.)

Zadanie 2a

(i) Sulfur dioxide is oxidized to sulfur trioxide by nitrogen dioxide in the atmosphere. Determine the enthalpy change, ΔH^⊖, in kJ mol⁻¹, for the reaction SO₂(g) + NO₂(g) → SO₃(g) + NO(g) given these reactions and enthalpy…

• Materiał graficzny

Chemia IBPaper 2, maj 2026, TZ3wzorowane7 pktotwarteśrednie (szac.)

Zadanie 2b

The oxidation of sulfur dioxide to sulfur trioxide is an equilibrium reaction. 2 SO₂(g) + O₂(g) ⇌ 2 SO₃(g) (i) State the equilibrium constant expression, K, for the reaction. (ii) Explain, with a reason, how compressing the gas mixture at constant…

• Materiał graficzny

Chemia IBPaper 2, maj 2026, TZ3wzorowane3 pktobliczenioweśrednie (szac.)

Zadanie 3a

Silver has two stable and abundant isotopes. Its relative atomic mass is 107.87. (i) Determine the percent abundance of each isotope, showing your working. (ii) State the number of protons, neutrons and electrons in $\ce{^{109}Ag+}$.

• Tabela do uzupełnienia

Chemia IBPaper 2, maj 2026, TZ3wzorowane5 pktotwarteśrednie (szac.)

Zadanie 3b

(i) Outline why the strength of the metallic bond increases from potassium, K, to calcium, Ca. (ii) Write an equation for the reaction of potassium, K, with water, including state symbols. (iii) Outline why the electronegativity of chlorine is greater than…

Chemia IBPaper 2, maj 2026, TZ3wzorowane2 pktotwartełatwe (szac.)

Zadanie 3c

Steel is an alloy of iron with a small percentage of carbon. (i) Outline one reason why steel is harder than pure iron. (ii) State one property of iron, other than hardness, that can be modified by forming an alloy.

Chemia IBPaper 2, maj 2026, TZ3wzorowane5 pktotwarteśrednie (szac.)

Zadanie 3d

Iron and nickel can be used to design a voltaic cell. Fe(s) + Ni²⁺(aq) → Fe²⁺(aq) + Ni(s) (i) Annotate the diagram with the appropriate electrodes, electrolyte solutions and the direction of electron flow. (ii) The redox reactions in some voltaic…

• Materiał graficzny

Chemia IBPaper 2, maj 2026, TZ3wzorowane3 pktotwarteśrednie (szac.)

Zadanie 4a

Reactions of halogenoalkanes with hydroxide ions are an example of nucleophilic substitution. Deduce the equation, showing the movement of electrons with curly arrows, for the reaction of 1-chloropropane with aqueous potassium hydroxide.

Chemia IBPaper 2, maj 2026, TZ3wzorowane5 pktobliczenioweśrednie (szac.)

Zadanie 4b

Propane undergoes complete combustion. C₃H₈(g) + 5 O₂(g) → 3 CO₂(g) + 4 H₂O(g) (i) Calculate the enthalpy change of reaction, ΔH, in kJ mol⁻¹, for the combustion of propane. Use section 12 of the data booklet. (ii) State the…

Chemia IBPaper 2, maj 2026, TZ3wzorowane2 pktotwarteśrednie (szac.)

Zadanie 4c

The compounds butan-1-ol and ethoxyethane have the same molar mass. Their structures are shown below. Explain, with reasons, why butan-1-ol has a higher boiling point than ethoxyethane.

• Materiał graficzny

Chemia IBPaper 2, maj 2026, TZ3wzorowane3 pktotwarteśrednie (szac.)

Zadanie 4d

Ethane, C₂H₆, reacts with chlorine, Cl₂, to produce chloroethane, C₂H₅Cl. Deduce the initiation step and two propagation steps for the mechanism of this reaction.