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…
Magnitude and temperature dependence of K
Interpret the size of K as a measure of how far a reaction proceeds (K much greater than 1 favours products), explain that K changes only with temperature, and relate the K values of a reaction and its reverse (1/K) or of a scaled equation.
Tę umiejętność sprawdza 12 zadań wzorowanych na arkuszach IB z lat 2023–2026.
Zadania sprawdzające tę umiejętność: 12 Otwórz w wyszukiwarce z filtrami
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
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.…
Zadanie 2b
When potassium thiocyanate solution is added to a pale yellow solution containing iron(III) ions, the following equilibrium is established. [Fe(H2O)6]3+(aq) + SCN−(aq) ⇌ [Fe(SCN)(H2O)5]2+(aq) + H2O(l) [Fe(H2O)6]3+(aq) is pale yellow and…
Zadanie 29
The following system is at equilibrium. H2(g) + I2(g) ⇌ 2 HI(g) K = 54 What is the value of the equilibrium constant, K, for the reaction 2 HI(g) ⇌ H2(g) + I2(g)? A. −54 B. C. D.
Zadanie 30
The container holding the equilibrium mixture below is compressed to half its volume while the temperature is kept constant. Which row gives the change in the amount of PCl5 and the effect on the equilibrium constant, K?…
Zadanie 29
A mixture of 1 mol of nitrogen and 1 mol of oxygen is left to reach equilibrium at 25 °C. N2(g) + O2(g) ⇌ 2 NO(g) K = 4.5 × 10−31 at 25 °C Which relationship holds in the equilibrium mixture? A. [NO] ≪ [N2] B.…
Zadanie 4d
State, with a reason, how the value of Kc changes when the temperature is raised, given that ΔH⊖ > 0.
Zadanie 23
The equilibrium constant for the reaction below is Kc = 4.5 × 10−31 at 298 K. Which combination is correct? N2(g) + O2(g) ⇌ 2 NO(g) A. products are favoured and ΔG is positive B. products are favoured and ΔG is negative C.…
Zadanie 5c
The ionic product constant of pure water, Kw, is 1.00 × 10−14 at 25 °C and 5.48 × 10−14 at 50 °C. (i) Suggest why the value of Kw for pure water becomes larger as the temperature rises. (ii) Calculate both the pH and the pOH of pure…
Zadanie 2a
In air, sulfur dioxide can be oxidized to sulfur trioxide. The reaction is reversible, and at high temperature it reaches equilibrium in a closed container. 2 SO2(g) + O2(g) ⇌ 2 SO3(g) (i) At 600 °C the equilibrium constant, K, for this reaction is…
- Tabela do uzupełnienia
Zadanie 22
At a certain temperature the equilibrium constant for the reaction H2(g) + I2(g) ⇌ 2 HI(g) is Kc = 64. Which value is the equilibrium constant of the reaction below at that temperature? A. 32 B. 8.0 C. 0.125 D.…