Zadania z chemii IB HL

The following results were obtained for the reaction between bromate(V) ions, bromide ions and hydrogen ions in aqueous solution. $\ce{BrO3^-(aq) + 5Br^-(aq) + 6H+(aq) -> 3Br2(aq) + 3H2O(l)}$ Experiment Initial [$\ce{BrO3^-}$] / $\mathrm{mol\,dm^{-3}}$ Initial…

The container holding the equilibrium mixture below is compressed to half its volume while the temperature is kept constant. Which row gives the change in the amount of $\ce{PCl5}$ and the effect on the equilibrium constant, $K$?…

What amount of oxygen, in mol, is required to burn 8.72 g of butane, $\ce{C4H10(g)}$, completely? $M$(butane) = 58.14 $\mathrm{g\,mol^{-1}}$ A. 0.0231 B. 0.150 C. 0.975 D. 1.95

The reaction between sodium thiosulfate and hydrochloric acid was carried out at several temperatures to determine its activation energy. A graph of $\ln k$ against $\dfrac{1}{T}$ was plotted from the processed data, and the gradient of the line of best fit…

What is the conjugate acid of the hydrogen phosphate ion, $\ce{HPO4^2-}$? A. $\ce{PO4^3-}$ B. $\ce{H2PO4-}$ C. $\ce{H3PO4}$ D. $\ce{HPO3^2-}$

What is the pH of a 0.020 $\mathrm{mol\,dm^{-3}}$ solution of nitric acid, $\ce{HNO3(aq)}$? A. 1.0 B. 1.7 C. 2.0 D. 12.3

Which two species can act both as Brønsted–Lowry acids and as Brønsted–Lowry bases? A. $\ce{H2CO3}$ and $\ce{CO3^{2-}}$ B. $\ce{HCO3-}$ and $\ce{SO3^{2-}}$ C. $\ce{HCO3-}$ and $\ce{HSO3-}$ D. $\ce{H2SO3}$ and $\ce{HSO3-}$

Which solution has a pH of 11.0 at 298 K? A. $10^{-3}\ \mathrm{mol\,dm^{-3}}$ $\ce{KOH(aq)}$ B. $10^{-11}\ \mathrm{mol\,dm^{-3}}$ $\ce{KOH(aq)}$ C. $10^{-3}\ \mathrm{mol\,dm^{-3}}$ $\ce{NH3(aq)}$ D. $10^{-3}\ \mathrm{mol\,dm^{-3}}$ $\ce{HCl(aq)}$

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.…