Zadania z chemii IB SL

Which of these solutions has a pH greater than 7 at 25 °C? A. $[\ce{H+}] = 1.0 \times 10^{-5}\ \mathrm{mol\,dm^{-3}}$ B. $[\ce{OH-}] = 1.0 \times 10^{-10}\ \mathrm{mol\,dm^{-3}}$ C. $[\ce{H3O+}] = 1.0 \times 10^{-11}\ \mathrm{mol\,dm^{-3}}$ D.…

The pH of a solution is measured as 4.0. Which value, in $\mathrm{mol\,dm^{-3}}$, is the hydrogen-ion concentration, $[\ce{H+}]$, of this solution? A. $4.0 \times 10^{-4}$ B. $1.0 \times 10^{-4}$ C. $1.0 \times 10^{4}$ D. $4.0 \times 10^{4}$

What is the main reason why nitric acid has a lower pH than ethanoic acid of the same concentration? A. Nitric acid is an oxidizing agent. B. Nitric acid ionizes to a greater extent in water. C. The conjugate base of nitric acid is stronger than that of…

Which equation correctly represents a reaction of dilute sulfuric acid? A. $\ce{H2SO4 + MgCO3 -> MgSO4 + CO2 + H2O}$ B. $\ce{H2SO4 + 2Ag -> Ag2SO4 + H2}$ C. $\ce{H2SO4 + 2KOH -> K2SO4 + H2}$ D. $\ce{H2SO4 + 2NaHCO3 -> Na2SO4 + 2H2O}$

Part of the reactivity series of metals is shown, from the most reactive to the least reactive. Mg, Al, Mn, Zn, Fe, Ni, Sn, Pb, Cu, Ag Which reaction is spontaneous? A. $\ce{Fe^{2+}(aq) + Ni(s) -> Ni^{2+}(aq) + Fe(s)}$ B.…

In which compound does nitrogen have an oxidation state of +3? A. $\ce{NH3}$ B. $\ce{HNO2}$ C. $\ce{NO2}$ D. $\ce{HNO3}$

Cadmium was added to separate solutions of silver nitrate and chromium(III) nitrate. $\ce{Cd(s) + 2AgNO3(aq) -> Cd(NO3)2(aq) + 2Ag(s)}$ $\ce{Cd(s) + Cr(NO3)3(aq)}$: no reaction Which list places the three metals in order from most reactive to least reactive?…

Which alcohol and which conditions would give the highest yield of 3-methylbutanoic acid on oxidation with acidified potassium dichromate(VI)? A. 3-methylbutan-2-ol, reflux B. 3-methylbutan-1-ol, distillation C. 3-methylbutan-1-ol, reflux D.…

Zinc displaces copper from aqueous copper(II) sulfate solution, as shown in the voltaic cell below. Which row correctly gives the sign and the electrode type of the zinc electrode in this cell? In each option the sign is given first and the electrode type…