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Which statements describe the activation energy of a reaction? I. The minimum energy that colliding particles must have in order to react II. The energy difference between the reactants and the transition state on an energy profile III. The energy difference…
Which changes would make the initial rate higher when 50 cm3 of 1.0 mol dm−3 hydrochloric acid reacts with excess marble chips? CaCO3(s) + 2 HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g) I. Raising the temperature by 10 K II. Using 100 cm3 of 1.0 mol…
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…
What is the equilibrium constant expression for the forward reaction? 2 SO2(g) + O2(g) ⇌ 2 SO3(g) A. B. C.…
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.…
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
How does an increase in pressure, at constant temperature, affect the position of the following equilibrium and the value of the equilibrium constant, Kc? N2O4(g) ⇌ 2 NO2(g) A. Shifts to the left; Kc is unchanged B. Shifts to…
Which statement about this reaction of permanganate ions with iron(II) ions is correct? MnO4−(aq) + 5 Fe2+(aq) + 8 H+(aq) → Mn2+(aq) + 5 Fe3+(aq) + 4 H2O(l) A. MnO4− is the reducing agent B. Fe3+ is reduced C. The oxidation state of…
Which statement about this reaction is correct? 2 Cl2 + O2 → 2 Cl2O A. Chlorine is the reducing agent. B. Oxygen is the reducing agent. C. Chlorine is reduced. D. Oxygen is oxidized.
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…