Umiejętności z tego działu sprawdzają 44 zadania wzorowane na arkuszach IB z lat 2022–2026. Dział pojawia się w 24 z 54 arkuszy w bazie.
Energy can also be produced by a hydrogen-oxygen fuel cell that uses an aqueous solution of sodium hydroxide as the electrolyte. Hydrogen gas is fed to the anode and oxygen gas to the cathode. (i) Deduce the half-equations for the electrode reactions in this…
Ethanol can be used as a fuel. (i) Calculate the enthalpy change for the combustion of ethanol using section 12 of the data booklet. C2H5OH(g) + 3 O2(g) → 2 CO2(g) + 3 H2O(g) (ii) The enthalpy of formation of ethanol is defined from its elements. State,…
What is the sum of the coefficients when this equation is balanced with the smallest whole numbers? A. 20 B. 37 C. 47 D. 53
Ethane burns in a limited supply of oxygen. Which product is formed by incomplete combustion but not by complete combustion? A. CO2 B. CO C. H2O D. SO2
Which option describes the electrode reactions in a hydrogen fuel cell with an acidic electrolyte? 2 H2(g) + O2(g) → 2 H2O(l) A. Cathode: hydrogen is oxidized; anode: oxygen is reduced B. Cathode: oxygen is reduced; anode: hydrogen is oxidized C.…
In a molten carbonate fuel cell the mixture of hydrogen and carbon dioxide from the reaction is fed to the anode, while a mixture of oxygen and carbon dioxide is fed to the cathode. Carbonate ions, CO32−, move through the molten electrolyte from the…
Suggest why a molten carbonate fuel cell running on this gas mixture is considered to have a low environmental impact.
State the equation for the formation of glucose by photosynthesis.
(i) Outline two advantages of using biobutanol rather than petrol (gasoline) as a fuel for vehicles. (ii) Calculate, using the average bond enthalpies in section 12 of the data booklet, the enthalpy change in kJ mol−1 for the combustion of…
What is the coefficient of oxygen when the equation for the complete combustion of butan-1-ol is balanced using the smallest whole numbers? The unbalanced equation is C4H9OH + O2 → CO2 + H2O. A. 4 B. 6 C. 7 D. 13
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