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.…
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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.…
What does the pre-exponential (Arrhenius) factor, A, represent in the Arrhenius equation ? A. The frequency of collisions with the correct orientation B. The activation energy of the reaction C. The overall rate constant of the reaction D.…
The decomposition of hydrogen peroxide in the presence of iodide ions occurs in two steps. H2O2(aq) + I−(aq) → H2O(l) + IO−(aq) (slow) H2O2(aq) + IO−(aq) → H2O(l) + O2(g) + I−(aq) (fast) What is the role of I− in this mechanism? A.…
A graph of ln k against 1/T for a reaction is a straight line, as predicted by the Arrhenius equation: What is the gradient of the line? A. Ea/R B. −Ea/R C. ln A D. −Ea
Which combination of substances is correctly used for electroplating an iron object with tin using an electrolytic cell? A. X: tin, Y: iron, Z: tin(II) sulfate solution B. X: iron, Y: tin, Z: tin(II) sulfate solution C. X: tin, Y: iron, Z: iron(II) sulfate…
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…
At 700 K the equilibrium constant, K, of the reaction below is 54.0. H2(g) + I2(g) ⇌ 2 HI(g) At one moment the mixture contains: What can be concluded about the mixture at this moment? A. The system is at…
Which of these salts, when dissolved in water to make solutions of equal concentration, has the highest pH? A. KCl B. NaHCO3 C. NH4Br D. NH4HCO3
Which products are formed when sulfuric acid, H2SO4(aq), reacts with solid magnesium carbonate, MgCO3(s)? A. MgSO4(s) and H2CO3(aq) B. MgSO4(aq), H2O(l) and CO2(g) C. MgSO4(s), H2O(l) and…
Two acid-base equilibria are shown. Equation 1: HCN(aq) + H2O(l) ⇌ CN−(aq) + H3O+(aq) Equation 2: NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH−(aq) Which option correctly describes the role of water in each forward reaction? A. In equation 1 water…