Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
Dodaj cały arkusz do zestawuAt room temperature hydrogen cyanide is a liquid that evaporates readily, whereas ethyne, , which has almost the same molar mass, is a gas that boils at −84 °C. (i) Draw the Lewis formula of the hydrogen cyanide molecule, showing all valence…
In aqueous solution hydrogen cyanide behaves as a weak acid. (i) Write an equation for the ionization of hydrogen cyanide in water. (ii) Outline two ways in which a solution of 0.050 could be distinguished experimentally from…
A related nitrile, ethanenitrile, , reacts with hydrogen according to the equilibrium: (i) Write the expression for the equilibrium constant, , for this reaction. (ii) Determine the oxidation states that…
Naturally occurring gallium consists of two isotopes: 60 % of the atoms contain 38 neutrons and the remaining 40 % contain 40 neutrons. (i) Use section 7 of the data booklet to deduce the nuclear symbol of the heavier isotope. (ii) Calculate the relative…
Gallium forms a sulfate of formula . (i) Both ionic and covalent bonding are present in this compound. State which particles are held together by each type of bond. (ii) Contrast covalent and ionic bonds in terms of what happens to the valence…
Suppose carbonyl dibromide were made by a free-radical chain reaction of carbon monoxide, , with bromine vapour, , started by ultraviolet light. The questions below treat this hypothetical route with the bond-enthalpy model. (i) Write an…
In moist air carbonyl dibromide is slowly hydrolyzed: (i) Suggest a method of monitoring the progress of this reaction at constant temperature so that its rate can be determined. (ii) Outline two reasons why a…
The structure of galantamine is shown below. (i) State the type of structural formula shown. (ii) State the name of the functional group that contains the nitrogen atom. (iii) Outline the effect of this functional group on the pH of water in which galantamine…
A chemist treated 22.99 g of galantamine with sulfuric acid to make the sulfate salt: The mass of salt isolated was 24.65 g. Determine the percentage yield of the salt. Use section 7 of the data booklet.