Zadanie 14
Which general formula describes a homologous series of unsaturated compounds? A. CnH2n+1OH B. CnH2n−2 C. CnH2n+1Br D. CnH2n+2
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Which general formula describes a homologous series of unsaturated compounds? A. CnH2n+1OH B. CnH2n−2 C. CnH2n+1Br D. CnH2n+2
Which classification is correct for this reaction? 2 Mg(s) + CO2(g) → 2 MgO(s) + C(s), heat is released A. Endothermic; temperature decreases; reactants more stable B. Exothermic; temperature decreases; products more stable C. Exothermic; temperature…
Manganese(IV) oxide is added to a solution of hydrogen peroxide, which then decomposes much faster. Which quantity on the energy profile of the decomposition is the same with and without the catalyst? A. The activation energy of the forward reaction B. The…
The diagram shows the energy profile of a reaction. Which expression could give the enthalpy change, ΔH, of this reaction in kJ mol−1? A. +87 − 215 B. −215 + 87 C. +215 − 87 D. −215 − 87
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
Which of the following processes are exothermic? I. K(g) → K+(g) + e− II. H2O(g) → H2O(l) III. Ag+(g) + Cl−(g) → AgCl(s) A. I and II only B. I and III only C. II and III only D. I, II and III
The enthalpy change for the combustion of propane is calculated from bond enthalpy data and compared with the literature value. C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(l) Which statement best explains why the calculated value is less negative than the…
Given the following data: CaO(s) + CO2(g) → CaCO3(s) ΔH = −p kJ 2 Ca(s) + O2(g) → 2 CaO(s) ΔH = −q kJ 2 CaCO3(s) → 2 Ca(s) + 2 C(s) + 3 O2(g) ΔH = +r kJ What is the ΔH of the…
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.…