Zadanie 2b
An electrolytic cell is made using inert electrodes and molten calcium chloride, CaCl2(l). State the half-equation for the reaction occurring at each electrode. Anode (positive electrode): Cathode (negative electrode):
Wczytuję zadania…
Zapisujemy na Twoim urządzeniu to, bez czego serwis nie działa, np. zalogowanie. Plików analitycznych użyjemy tylko za Twoją zgodą. Szczegóły w polityce prywatności.
Baza zadań
Wybierz umiejętność, rok lub poziom trudności. Każde zadanie ma klucz i schemat punktowania.
Pokazujemy tylko poziomy, dla których mamy zadania.
Znaleziono 1061 zadań
An electrolytic cell is made using inert electrodes and molten calcium chloride, CaCl2(l). State the half-equation for the reaction occurring at each electrode. Anode (positive electrode): Cathode (negative electrode):
Give the number of protons, electrons and neutrons in the calcium ion, .
Calcium reacts with water to form calcium hydroxide solution and hydrogen gas. Ca(s) + 2 H2O(l) → Ca(OH)2(aq) + H2(g) (i) Use the thermochemical equations in the table to calculate the enthalpy change, in kJ, when 8.00 g of calcium reacts completely…
Suggest why it is important that hydrogen gas flows through the tube (i) before heating begins, (ii) from the end of heating until the product has cooled.
(i) State which two further mass measurements are needed to find the oxide composition. (ii) Outline how these measurements give the mass of oxygen removed from the sample.
Suggest why the amount of oxygen per mole of iron calculated from the results is often lower than the true value, and how this error could be reduced.
Magnesium burns in oxygen. 2 Mg(s) + O2(g) → 2 MgO(s) What mass of magnesium oxide, in g, forms when 2.43 g of magnesium reacts with 3.41 dm3 of oxygen at STP? Mr(MgO) = 40.31; molar volume = 22.7 dm3 mol−1 A.…
Sulfur dioxide, SO2, can be represented by more than one Lewis (electron dot) structure. (i) Sketch a Lewis (electron dot) structure of SO2 in which all atoms obey the octet rule. (ii) State the molecular geometry of SO2 and the O-S-O bond…
Suggest why sulfur dioxide released into the atmosphere is an environmental concern.
Sulfuryl chloride, SO2Cl2, is made industrially from sulfur dioxide and chlorine in the presence of an activated carbon catalyst. SO2(g) + Cl2(g) ⇌ SO2Cl2(g) ΔH⊖ < 0 (i) Sketch a potential energy profile for the forward reaction,…