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, TZ3wzorowane9 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 pktzamknięteśrednie (szac.)

Zadanie 27

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, TZ1wzorowane1 pktzamkniętetrudne (szac.)

Zadanie 28

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 28

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 28

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, TZ2wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 30

The system A(g) + B(g) ⇌ 2 C(g) has an equilibrium constant K = 2.5 × 10⁻². What is correct about the direction of the spontaneous change when Q = 3.0? In each option the first part states which species are in excess and the second part the…

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

Zadanie 30

At 700 K the equilibrium constant, K, of the reaction below is 54.0. H₂(g) + I₂(g) ⇌ 2 HI(g) $K = \dfrac{[\ce{HI}]^2}{[\ce{H2}][\ce{I2}]}$ At one moment the mixture contains: What can be concluded about the mixture at this moment? A. The system is at…

• Tabela do uzupełnienia

Chemia IBPaper 2, maj 2025, TZ2wzorowane10 pktobliczeniowetrudne (szac.)

Zadanie 1c

The cyanide ion acts as a ligand in many complex ions, for example hexacyanoferrate(III), [Fe(CN)₆]³⁻. (i) State the type of bond, as precisely as possible, that joins each cyanide ion to the iron ion. (ii) Deduce the oxidation state of iron in…