Zadanie 23
Which statements about the position of equilibrium are correct? ΔG⊖ = −RTln K I. If ΔG⊖ > 0, then K < 1 and the reactants are favoured. II. At equilibrium, ΔG⊖ is equal to zero. III. If ΔG⊖ = 0,…
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Which statements about the position of equilibrium are correct? ΔG⊖ = −RTln K I. If ΔG⊖ > 0, then K < 1 and the reactants are favoured. II. At equilibrium, ΔG⊖ is equal to zero. III. If ΔG⊖ = 0,…
The pH of solution P is 3 and the pH of solution Q is 9. What is the ratio of their H3O+ concentrations? A. [H3O+] is 3 times higher in P than in Q. B. [H3O+] is 6 times higher in P than in Q. C. [H3O+] is 1 × 103 times…
Using the data in the table, which conjugate base is the weakest? A. CN− B. CH3COO− C. NO2− D. CHCl2COO−
Consider the buffer system made from ethanoic acid and sodium ethanoate, CH3COOH / CH3COONa. What happens when a small amount of strong acid is added to the buffer? A. [CH3COOH] increases. B. [CH3COO−] increases. C. The H+…
A 20.0 cm3 sample of a weak monoprotic acid, HA, was titrated with sodium hydroxide solution of concentration 0.100 mol dm−3. What is the pKb of the conjugate base of HA, A−? A. 3 B. 5 C. 9 D. 11
In which reaction does N2 act as a reducing agent? A. N2(g) + 3 H2(g) → 2 NH3(g) B. 3 Mg(s) + N2(g) → Mg3N2(s) C. N2(g) + O2(g) → 2 NO(g) D. 6 Li(s) + N2(g) → 2 Li3N(s)
A voltaic cell is constructed from a half-cell of metal M in a solution of M2+ ions and a half-cell of metal N in a solution of N2+ ions. The half-cells are joined by a salt bridge and an external wire.…
For a reaction in a voltaic cell, both ΔH⊖ and ΔS⊖ are negative. Which statement is correct? ΔG⊖ = ΔH⊖ − TΔS⊖ and ΔG⊖ = −nFEcell⊖ A.…
A half-cell of metal X in a 1.00 mol dm−3 solution of X2+ ions is connected to a standard hydrogen electrode (SHE). The voltmeter reads 0.34 V and the X electrode is the positive terminal. Which statement is correct? A. The standard…
Which functional groups are present in the compound shown? A. Carboxyl, hydroxyl and primary amino B. Ester, ether and primary amino C. Ester, hydroxyl and secondary amino D. Ester, hydroxyl and primary amino