Zadanie 22
In which reaction will there be a decrease in entropy? A. NH4NO3(s) → NH4NO3(aq) B. CaCO3(s) → CaO(s) + CO2(g) C. 2 H2(g) + O2(g) → 2 H2O(l) D. N2O4(g) → 2 NO2(g)
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In which reaction will there be a decrease in entropy? A. NH4NO3(s) → NH4NO3(aq) B. CaCO3(s) → CaO(s) + CO2(g) C. 2 H2(g) + O2(g) → 2 H2O(l) D. N2O4(g) → 2 NO2(g)
Which ionic compound is expected to have the largest lattice enthalpy? A. MgO B. NaF C. KBr D. CaS
Under which temperature conditions is ΔG⊖ negative for this reaction? CaCO3(s) → CaO(s) + CO2(g) ΔH⊖ = +178 kJ mol−1 A. Low temperatures only B. High temperatures only C. Any temperatures D. No temperatures
What is the effect of decreasing temperature on this Maxwell-Boltzmann energy distribution curve? A. The curve maximum is higher and to the left of A. B. The curve maximum is lower and to the right of A. C. The curve maximum is higher and to the right of A. D.…
The Born–Haber cycle for the formation of potassium fluoride, KF, is shown. What is the enthalpy of formation of potassium fluoride, KF, in kJ mol-1? A. −490 B. +86.5 C. +1088.5 D. −569.5
Which expression gives the standard enthalpy change of hydrogenation of propyne, in kJ mol−1? CH3C≡CH(g) + 2 H2(g) → CH3CH2CH3(g) A. −1937 − (2 × 286) + 2220 B. −2220 + 1937 + (2 × 286) C. −1937 − 286 + 2220 D. −1937 + 2220
Which volume of oxygen is required to react fully with 40.0 cm3 of butane to ensure complete combustion? 2 C4H10(g) + 13 O2(g) → 8 CO2(g) + 10 H2O(g) A. 520 cm3 B. 260 cm3 C. 130 cm3 D. 40.0 cm3
The concentration of reactant A was followed over time, and the rate of the reaction was measured at several concentrations of A. What is the order of reaction with respect to A? A. Zero order B. First order C. Second order D. Cannot be determined
70 dm3 of nitrogen and 150 dm3 of hydrogen are mixed and react to form ammonia; all gas volumes are measured at the same temperature and pressure. N2(g) + 3 H2(g) → 2 NH3(g) What is the percentage yield of ammonia if 66 dm3 is obtained? A. 44 %…
Which substances will be present in the reaction vessel at the end of the reaction between 1.5 g of magnesium and 50.0 cm3 of 1.0 mol dm⁻³ hydrochloric acid? Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) A. HCl(aq), MgCl2(aq) B. Mg(s),…