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
(i) Silver ions oxidize copper metal. 2 Ag+(aq) + Cu(s) → 2 Ag(s) + Cu2+(aq) Calculate the standard cell potential, Ecell⊖, in V, for this reaction. Use section 19 of the data booklet. (ii) Determine, giving a reason, whether lead(II)…
Molten lead(II) bromide undergoes electrolysis in an electrolytic cell at 420 °C, using inert electrodes. (i) Deduce the half-equation for the reaction at each electrode. Cathode (negative electrode): Anode (positive electrode): (ii) Deduce the…
Bromine has two naturally occurring isotopes, and . The relative atomic mass of bromine is 79.90. What is the approximate percentage abundance of ? A. 25 % B. 45 % C. 55 % D. 75 %
State the relationship between CH3NH3+ and CH3NH2 in terms of the Brønsted-Lowry theory.
A sample of methylamine gas, volume 120.0 dm3 at 295.0 K and 102.0 kPa, dissolves in water and the solution is made up to 2.50 dm3. Determine the concentration of the solution, in mol dm−3. Use sections 1 and 2 of the…
The base dissociation constant of methylamine at 298 K is Kb = 4.4 × 10−4. (i) Calculate the concentration of hydroxide ions in a methylamine solution with pH = 11.6. Use sections 1 and 2 of the data booklet. (ii) Calculate the concentration, in…
Aluminium salts form acidic solutions owing to equilibria such as: Al3+(aq) + H2O(l) ⇌ Al(OH)2+(aq) + H+(aq) Comment on the role of Al3+ in forming the Al(OH)2+ ion, in acid-base terms.
Al(OH)2+ is a complex ion, yet aluminium is not classed as a transition metal. Contrast aluminium with chromium, Cr, for one characteristic chemical property of transition metals, apart from the formation of complex ions. Property: Comparison:
Which value is the relative atomic mass of the element that gives the mass spectrum shown below? A. 40 B. 41 C. 42 D. 44
The reaction between nitrogen dioxide and carbon monoxide was studied at 600 K. NO2(g) + CO(g) → NO(g) + CO2(g) The following experimental data were obtained. (i) Deduce the order of reaction with respect to nitrogen dioxide. (ii) Deduce the rate…