How far? The extent of chemical change

Chemia IBPaper 2, maj 2026, TZ1wzorowane5 pktotwarteśrednie (szac.)

Zadanie 1b

The second step converts nitrogen monoxide to nitrogen dioxide. 2 NO(g) + O₂(g) ⇌ 2 NO₂(g) ΔH^⊖ = −114 kJ mol⁻¹ (i) Identify the oxidation state of nitrogen in NO and in NO₂. (ii) State the equilibrium constant…

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 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 1A, maj 2026, TZ1wzorowane1 pktzamkniętetrudne (szac.)

Zadanie 22

What can be deduced about this equilibrium reaction from these data? A(g) + B(g) ⇌ 2 C(g) A. It is an exothermic reaction and [products] < [reactants] at equilibrium. B. It is an endothermic reaction and [products] < [reactants] at equilibrium. C. It…

• Tabela do uzupełnienia

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

Zadanie 22

What is the equilibrium constant expression for the forward reaction? 2 SO₂(g) + O₂(g) ⇌ 2 SO₃(g) A. $K = \dfrac{2[\ce{SO3}]}{2[\ce{SO2}] + [\ce{O2}]}$ B. $K = \dfrac{[\ce{SO2}]^2[\ce{O2}]}{[\ce{SO3}]^2}$ C.…

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

Zadanie 22

The equilibrium below is established at one temperature. PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) K = 4.0 × 10⁻² What is K for the reverse reaction at this temperature? A. 2.5 × 10¹ B. 1.6 × 10⁻³ C. 4.0 × 10⁻² D.…

Chemia IBPaper 1A, maj 2026, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 23

Which change would shift the position of this equilibrium towards the products? H₂(g) + I₂(g) ⇌ 2 HI(g) ΔH = −9 kJ mol⁻¹ A. Increase pressure B. Decrease pressure C. Increase temperature D. Decrease temperature

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

Zadanie 23

How does an increase in pressure, at constant temperature, affect the position of the following equilibrium and the value of the equilibrium constant, K_c? N₂O₄(g) ⇌ 2 NO₂(g) A. Shifts to the left; K_c is unchanged B. Shifts to…

Chemia IBPaper 2, maj 2025, TZ2wzorowane2 pktotwartełatwe (szac.)

Zadanie 1c

A related nitrile, ethanenitrile, CH₃CN, reacts with hydrogen according to the equilibrium: CH₃CN(g) + 2 H₂(g) ⇌ CH₃CH₂NH₂(g) (i) Write the expression for the equilibrium constant, K, for this reaction. (ii) Determine the oxidation states that…

Chemia IBPaper 1B, maj 2025, TZ3wzorowane3 pktotwarteśrednie (szac.)

Zadanie 1c

A sample of 0.0120 mol of NO₂ was placed in a sealed vessel of volume 1.00 dm³, which was kept at a constant temperature of 35 °C. (i) Suggest a simple way of keeping the vessel at a constant temperature in a school laboratory. (ii) The…