Zadania z chemii IB HL

Chemia IBPaper 1A, maj 2026, TZ1wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 1

What is correct about the species $\ce{^{65}Zn^{2+}}$? A. 65 protons, 65 neutrons, 63 electrons B. 30 protons, 35 neutrons, 28 electrons C. 30 protons, 65 neutrons, 28 electrons D. 65 protons, 35 neutrons, 63 electrons

Chemia IBPaper 1B, maj 2026, TZ1wzorowane7 pktobliczenioweśrednie (szac.)

Zadanie 1a

(a) The graph shows how the water level of the Salton Sea has changed since 1950. The reference point for the water level is sea level. (i) Suggest a reason why the values plotted on the vertical axis are negative. (ii) Describe the general trend in the rate…

• Materiał graficzny

Chemia IBPaper 1B, maj 2026, TZ1wzorowane9 pktobliczenioweśrednie (szac.)

Zadanie 1b

(b) A variety of ions are dissolved in the water of the Salton Sea. The concentrations of the major ions are shown in the table below, based on two different sources (both scientific journals). (i) Suggest two reasons for the difference in the concentration of…

• Tabela do uzupełnienia

Chemia IBPaper 1B, maj 2026, TZ1wzorowane9 pktobliczenioweśrednie (szac.)

Zadanie 1c

(c) A simple set-up was used to compare the conductivity of water samples obtained from the Salton Sea at different depths. The following data were obtained: (i) State the independent and the dependent variable in this experiment. (ii) Suggest two variables,…

• Tabela do uzupełnienia
• Materiał graficzny

Chemia IBPaper 2, maj 2026, TZ1wzorowane3 pktobliczenioweśrednie (szac.)

Zadanie 1a

(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.…

Chemia IBPaper 2, maj 2026, TZ1wzorowane5 pktotwarteśrednie (szac.)

Zadanie 1b

The second step converts nitrogen monoxide to nitrogen dioxide. 2 NO(g) + O₂(g) ⇌ 2 NO₂(g) ΔH^⊖ = −114 kJ mol⁻¹ (i) Identify the oxidation state of nitrogen in NO and in NO₂. (ii) State the equilibrium constant…

Chemia IBPaper 2, maj 2026, TZ1wzorowane4 pktotwarteśrednie (szac.)

Zadanie 1c

The final step can be summarized as: 3 NO₂(g) + H₂O(l) → 2 HNO₃(aq) + NO(g) ΔH^⊖ = −138 kJ mol⁻¹ (i) Sketch an energy profile for the overall reaction, indicating ΔH^⊖ and the activation energy. (ii) Describe the…

• Materiał graficzny

Chemia IBPaper 2, maj 2026, TZ1wzorowane6 pktotwarteśrednie (szac.)

Zadanie 1d

Nitric acid, HNO₃, is strong, while nitrous acid, HNO₂, is weak. (i) Outline the difference between a strong and a weak acid. (ii) Deduce the Lewis formula and the molecular geometry for the nitrite ion, NO₂⁻. (iii) State the hybridization…

Chemia IBPaper 2, maj 2026, TZ1wzorowane4 pktobliczenioweśrednie (szac.)

Zadanie 1e

Many rechargeable batteries use an alkaline electrolyte. In the nickel-cadmium cell, cadmium, Cd, is the anode. Cd(OH)₂(s) + 2 e⁻ → Cd(s) + 2 OH⁻(aq) E^⊖ = −0.81 V…

Chemia IBPaper 2, maj 2026, TZ1wzorowane6 pktotwarteśrednie (szac.)

Zadanie 1f

Energy can also be produced by a hydrogen-oxygen fuel cell that uses an aqueous solution of sodium hydroxide as the electrolyte. Hydrogen gas is fed to the anode and oxygen gas to the cathode. (i) Deduce the half-equations for the electrode reactions in this…