Zadanie 20
Phosphine decomposes according to the equation 4 PH3(g) → P4(g) + 6 H2(g). The rate of the reaction can be expressed as the rate of change of the concentration of P4, Δ[P4]/Δt. Which expression is equal to this rate? A.…
Wczytuję zadania…
Zapisujemy na Twoim urządzeniu to, bez czego serwis nie działa, np. zalogowanie. Plików analitycznych użyjemy tylko za Twoją zgodą. Szczegóły w polityce prywatności.
Wybierz umiejętność, rok lub poziom trudności.
Pokazujemy tylko poziomy, dla których mamy zadania.
Znaleziono 1476 zadań
Phosphine decomposes according to the equation 4 PH3(g) → P4(g) + 6 H2(g). The rate of the reaction can be expressed as the rate of change of the concentration of P4, Δ[P4]/Δt. Which expression is equal to this rate? A.…
A proposed mechanism for the reaction between nitrogen(II) oxide and hydrogen, which is overall exothermic, is shown. Which profile is consistent with this mechanism? A. Profile A B. Profile B C. Profile C D. Profile D
A proposed mechanism for the reaction between nitrogen monoxide and hydrogen is 2 NO(g) → N2O2(g) (fast) N2O2(g) + H2(g) → N2O(g) + H2O(g) (slow) N2O(g) + H2(g) → N2(g) + H2O(g) (fast) The overall reaction is exothermic. Which potential…
The temperature of a reaction mixture is raised from 300 K to 320 K and nothing else is changed. Which quantity increases? A. Activation energy, Ea B. Rate constant, k C. Standard enthalpy change of the reaction, ΔH⊖ D. Order of…
The temperature of a reaction mixture is raised and no catalyst is used. Which quantity changes, even though it does not depend on the concentrations of the reactants? A. Rate of reaction B. Order of reaction C. Rate constant D. Activation energy
Which change would increase the amount of CO(g) in the equilibrium mixture below? CH4(g) + H2O(g) ⇌ CO(g) + 3 H2(g) ΔH⊖ = +206 kJ A. Adding a catalyst to the system B. Decreasing the volume of the reaction vessel C.…
The system below is at equilibrium. CH4(g) + H2O(g) ⇌ CO(g) + 3 H2(g) ΔH⊖ = +206 kJ Which change to the equilibrium mixture would produce more H2(g)? A. Adding a catalyst B. Increasing the pressure by decreasing the…
The system 2 A(g) ⇌ 3 B(g) + C(g) is at equilibrium, and the concentrations of A, B and C are all 3 mol dm−3. What is Kc for this system? Ignore units. A. 0.11 B. 3 C. 9 D. 27
The system 2 A(g) ⇌ 3 B(g) + C(g) is at equilibrium with the concentrations of A, B and C all equal to 3.0 mol dm−3. Which value is Kc for this system? A. 3 B. 27 C. 9 D. 81
Equal volumes (20.0 cm3 each) of two solutions are mixed. Which pair gives a buffer solution? A. 0.20 mol dm−3 CH3COOH and 0.10 mol dm−3 NaOH B. 0.10 mol dm−3 CH3COOH and…