Zadanie 14
Consider the following equations. H2(g) + Cl2(g) → 2 HCl(g) ΔH⊖ = −x kJ C(s) + 2 Cl2(g) → CCl4(g) ΔH⊖ = −y kJ 2 C(s) + H2(g) → C2H2(g) ΔH⊖ = +z kJ What…
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Consider the following equations. H2(g) + Cl2(g) → 2 HCl(g) ΔH⊖ = −x kJ C(s) + 2 Cl2(g) → CCl4(g) ΔH⊖ = −y kJ 2 C(s) + H2(g) → C2H2(g) ΔH⊖ = +z kJ What…
Two samples of the same gas, at temperatures T1 and T2 where T2 > T1, have the Maxwell–Boltzmann distributions of kinetic energy shown. Which diagram is correct? A. Diagram A B. Diagram B C. Diagram C D. Diagram D
Some antacid tablets contain aluminium hydroxide. Write an equation for the neutralization reaction between aluminium hydroxide and stomach acid (hydrochloric acid).
50.0 cm3 of copper(II) sulfate solution of concentration 0.200 mol dm−3 is placed in an insulated cup. Excess zinc powder is added and the mixture is stirred. The maximum temperature increase is 10.4 °C.…
An excess of calcium carbonate lumps was added to a beaker of dilute hydrochloric acid, HCl(aq). Carbon dioxide escapes from the beaker, so the mass of the beaker and its contents was recorded against time to give curve 1. Which change could give curve…
Ammonia dissolves in water as shown in the equation below. What will happen if the temperature of the solution is increased? NH3(g) + H2O(l) ⇌ NH4+(aq) + OH−(aq) ΔH⊖ = −31 kJ mol−1 A. The equilibrium shifts to the left…
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…
Which of these species has the weakest conjugate base? A. CH3COOH B. NH4+ C. H2O D. HNO3
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 A in a solution of A2+ ions and a half-cell of metal B in a solution of B2+ ions. The half-cells are joined by a salt bridge and an external wire. Metal B is the more reactive metal. What…