Umiejętności z tego działu sprawdza 101 zadań wzorowanych na arkuszach IB z lat 2022–2026. Dział pojawia się w 46 z 54 arkuszy w bazie.
(i) The first step is the catalytic oxidation of ammonia gas to nitrogen monoxide. 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g) Determine the volume, in dm3, of nitrogen monoxide produced from 20.0 g of ammonia, at STP, using section 2 of the data booklet.…
(i) Write a balanced equation for the reaction, including state symbols. (ii) Deduce what property of this reaction makes it possible to follow its rate by both methods. (iii) Magnesium carbonate was used in excess so that all of the acid would react.…
The student repeated the experiment using Method 2, with the same quantities of acid and solid. (i) Calculate the volume of gas that will have collected in the measuring cylinder once the reaction has finished, measured at T = 22 °C and…
Potassium also forms compounds with polyatomic ions. 2 KOH(aq) + Cu(NO3)2(aq) → Cu(OH)2(s) + 2 KNO3(aq) (i) 30.0 cm3 of a 0.380 mol dm−3 potassium hydroxide, KOH, solution is mixed with 25.0 cm3 of a 0.310…
(i) Determine the enthalpy of combustion of pentane, in kJ mol−1, using table 12 in the data booklet. C5H12(g) + 8 O2(g) → 5 CO2(g) + 6 H2O(g) (ii) Calculate the mass, in g, of carbon dioxide, CO2, produced when 45.0 g of pentane react with…
Sodium reacts vigorously with water. (i) Write an equation, with state symbols, for the reaction of sodium with water. (ii) Describe one observation from the reaction in (i). (iii) Sketch, on the axes below, an energy profile for this reaction. Label the…
A sample of the sodium hydroxide solution is gradually added to 25.0 cm3 of an aqueous solution of an unknown organic acid, producing the following pH curve. Calculate the concentration of the unknown organic acid.
Magnesium burns in oxygen according to the equation below. What is the limiting reactant when 3.0 mol of magnesium reacts with 2.0 mol of oxygen? 2 Mg(s) + O2(g) → 2 MgO(s) A. Mg B. O2 C. Both reactants are completely consumed D. Neither;…
Excess magnesium is added to separate samples of aqueous acid. Which sample produces the greatest amount of hydrogen gas? Mr(HCl) = 36.46, Vm = 22.7 dm3 mol−1…
Which substances will be present in the reaction vessel at the end of the reaction between 1.5 g of magnesium and 50.0 cm3 of 1.0 mol dm⁻³ hydrochloric acid? Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) A. HCl(aq), MgCl2(aq) B. Mg(s),…
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