Zadanie 1
Which equation represents the condensation of bromine? A. Br2(g) → Br2(l) B. Br2(l) → Br2(g) C. Br2(l) → Br2(s) D. Br2(s) → Br2(g)
Chemistry HL Paper 1A, May 2026, TZ3
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 zestawuZadanie 2
Some successive ionization energies of an element are listed in the table. Which group of the periodic table contains this element? A. 14 B. 15 C. 16 D. 17
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Zadanie 3
Which statement about the visible line emission spectrum of atomic hydrogen is correct? A. The lines are equally spaced because the energy levels are equally spaced B. The lines get closer together towards longer wavelength because the energy levels converge…
Zadanie 4
What is the number of hydrogen atoms in 0.200 mol of propylamine, C3H7NH2? NA = 6.02 × 1023 mol−1 A. 1.20 × 1023 B. 1.08 × 1024 C. 8.43 × 1023 D. 1.08 × 1025
Zadanie 5
A fixed amount of an ideal gas is kept at constant temperature while its pressure P is changed. Which graph gives a straight line passing through the origin? A. V against P B. 1/V against 1/P C. PV against P D. V against 1/P
Zadanie 6
Chrome alum has the formula KCr(SO4)2 ⋅ 12 H2O. Which option shows the charges of the ions that make up this salt, in the order potassium, chromium, sulfate? A. K+, Cr2+, SO42− B. K+, Cr3+, SO43− C.…
Zadanie 7
Which statement about diamond, carbon dioxide and silicon dioxide is correct? A. The central atoms in carbon dioxide and in silicon dioxide have the same electron domain geometry B. Diamond and carbon dioxide both have high melting points C. Diamond and…
Zadanie 8
A mixture of compounds X and Y is analysed by thin layer chromatography. The stationary phase is silica gel and the solvent used is hexane. The chromatogram is shown. Which option is consistent with this chromatogram? A. RF of Y is 0.80; compound Y…
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Zadanie 9
Asparagine, an amino acid, has the structure shown. What are the numbers of sigma (σ) and pi (π) bonds in one molecule of asparagine? A. 14 σ and 2 π B. 16 σ and 4 π C. 16 σ and 2 π D. 18 σ and 2 π
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Zadanie 10
A section of the chain of an addition polymer is drawn below. From which monomer is this polymer made? A. CH2=CHCH2CH3 B. CH3CH2CH2CH3 C. CH3CH=CHCH3 D. (CH3)2C=CH2
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Zadanie 11
A segment of a condensation polymer is shown. Which statement is correct about one of the monomers from which this polymer is made? A. It is H2N(CH2)6NH2 B. It is H2N(CH2)4NH2 C. It is HOOC(CH2)6COOH D. It is H2N(CH2)5COOH
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Zadanie 12
Which row correctly describes how the properties of the halogens change down group 17, listed in the order: non-metallic character, boiling point of the element, atomic radius? A. Increases, increases, increases B. Decreases, increases, increases C. Decreases,…
Zadanie 13
Which of these could be the ground-state electron configuration of an atom of a d block element? A. [Ar] 4s2 3d10 4p1 B. [Ne] 3s2 3d6 C. [Ar] 4s2 3d6 D. [Ar] 4s2 4p6
Zadanie 14
The complex ion [Zn(H2O)6]2+ is colourless, but the complex ion [Cu(H2O)6]2+ is blue. Which option gives a correct reason for the zinc complex and the electron configuration of the copper(II) ion? A. Light is absorbed when an electron is…
Zadanie 15
Which of the following are structural isomers of the compound shown? I. 2-methylbut-2-ene II. 2-methylpent-1-ene III. pent-2-ene A. I and II only B. I and III only C. II and III only D. I, II and III
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Zadanie 16
Which set contains compounds that all belong to one homologous series? A. CH3CHO, CH3COCH3, CH3CH2CHO B. CH3COOH, CH3CH2COOH, CH3(CH2)2COOH C. CH3CH2NH2, CH3CH2NHCH3, CH3CH2CH2NH2 D.…
Zadanie 17
Which of the compounds shown is chiral and so exists as a pair of enantiomers? A. Compound A B. Compound B C. Compound C D. Compound D
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Zadanie 18
Which option describes the 1H NMR spectrum of the compound shown? A. 2 signals, relative areas 3:5 B. 3 signals, relative areas 3:4:1 C. 5 signals, relative areas 3:2:1:1:1 D. 4 signals, relative areas 3:2:2:1
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Zadanie 19
The diagram shows the energy profile of a reaction. Which expression could give the enthalpy change, ΔH, of this reaction in kJ mol−1? A. +87 − 215 B. −215 + 87 C. +215 − 87 D. −215 − 87
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Zadanie 20
Which option describes the electrode reactions in a hydrogen fuel cell with an acidic electrolyte? 2 H2(g) + O2(g) → 2 H2O(l) A. Cathode: hydrogen is oxidized; anode: oxygen is reduced B. Cathode: oxygen is reduced; anode: hydrogen is oxidized C.…
Zadanie 21
Which of these changes has the largest negative standard enthalpy change, ΔH⊖? A. Na+(g) + Cl−(g) → NaCl(s) B. SrO(s) → Sr2+(g) + O2−(g) C. Ca2+(g) + 2 Cl−(g) → CaCl2(s) D. Mg2+(g) + O2−(g) → MgO(s)
Zadanie 22
Under which temperature conditions is ΔG⊖ negative for this reaction? CaCO3(s) → CaO(s) + CO2(g) ΔH⊖ = +178 kJ mol−1 A. Low temperatures only B. High temperatures only C. Any temperatures D. No temperatures
Zadanie 23
Which expression gives the standard enthalpy change of hydrogenation of propyne, in kJ mol−1? CH3C≡CH(g) + 2 H2(g) → CH3CH2CH3(g) A. −1937 − (2 × 286) + 2220 B. −2220 + 1937 + (2 × 286) C. −1937 − 286 + 2220 D. −1937 + 2220
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Zadanie 24
70 dm3 of nitrogen and 150 dm3 of hydrogen are mixed and react to form ammonia; all gas volumes are measured at the same temperature and pressure. N2(g) + 3 H2(g) → 2 NH3(g) What is the percentage yield of ammonia if 66 dm3 is obtained? A. 44 %…
Zadanie 25
A sample of chalk is dissolved in acid and titrated with EDTA solution, represented as H2X2−. The titration requires 18.4 cm3 of 0.250 mol dm−3 EDTA. What is the mass of calcium carbonate, CaCO3, in the sample?…
Zadanie 26
Which changes would make the initial rate higher when 50 cm3 of 1.0 mol dm−3 hydrochloric acid reacts with excess marble chips? CaCO3(s) + 2 HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g) I. Raising the temperature by 10 K II. Using 100 cm3 of 1.0 mol…
Zadanie 27
The reaction between nitrogen dioxide and fluorine has the overall equation: 2 NO2(g) + F2(g) → 2 NO2F(g) The reaction follows the energy profile shown: Two mechanisms are suggested: Which suggested mechanism is consistent with the energy profile? A. X…
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Zadanie 28
The equilibrium below is established at one temperature. PCl5(g) ⇌ PCl3(g) + Cl2(g) K = 4.0 × 10−2 What is K for the reverse reaction at this temperature? A. 2.5 × 101 B. 1.6 × 10−3 C. 4.0 × 10−2 D.…
Zadanie 29
A graph of ln k against 1/T for a reaction is a straight line, as predicted by the Arrhenius equation: What is the gradient of the line? A. Ea/R B. −Ea/R C. ln A D. −Ea
Zadanie 30
At 700 K the equilibrium constant, K, of the reaction below is 54.0. H2(g) + I2(g) ⇌ 2 HI(g) At one moment the mixture contains: What can be concluded about the mixture at this moment? A. The system is at…
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Zadanie 31
Two acid-base equilibria are shown. Equation 1: HCN(aq) + H2O(l) ⇌ CN−(aq) + H3O+(aq) Equation 2: NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH−(aq) Which option correctly describes the role of water in each forward reaction? A. In equation 1 water…
Zadanie 32
A 25.0 cm3 sample of nitric acid solution has a pH of 1.0. Distilled water is added until the total volume is 500 cm3. What is [H+] in the final solution, in mol dm−3? A. 5.0 × 10−4 B. 5.0 × 10−3 C.…
Zadanie 33
The curve shows the pH during the titration of 25.0 cm3 of a weak monoprotic acid with 0.100 mol dm−3 NaOH. Which value is the pKa of the acid? A. 2.6 B. 6.0 C. 8.2 D. 3.8
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Zadanie 34
When heated under reflux with excess acidified potassium dichromate(VI), how many of the structural isomers of the alcohol C5H11OH are oxidized to a carboxylic acid? A. 3 B. 7 C. 4 D. 8
Zadanie 35
Both of the reactions below occur spontaneously at room temperature. Zn(s) + Fe2+(aq) → Zn2+(aq) + Fe(s) Fe(s) + Sn2+(aq) → Fe2+(aq) + Sn(s) Which conclusion can be drawn about a voltaic cell built from the half-cells…
Zadanie 36
Which statement about this reaction of permanganate ions with iron(II) ions is correct? MnO4−(aq) + 5 Fe2+(aq) + 8 H+(aq) → Mn2+(aq) + 5 Fe3+(aq) + 4 H2O(l) A. MnO4− is the reducing agent B. Fe3+ is reduced C. The oxidation state of…
Zadanie 37
Which compound is formed when CH3CH2CH(CH3)C≡CH reacts with excess H2(g) over a nickel catalyst? A. 3-methylpentane B. 2-methylpentane C. 2,3-dimethylbutane D. hexane
Zadanie 38
In the nitration of benzene, the electrophile NO2+ is produced by the reaction of concentrated nitric acid with concentrated sulfuric acid. HNO3 + 2 H2SO4 → NO2+ + H3O+ + 2 HSO4− Which statement describes the role of sulfuric acid in this…
Zadanie 39
Which statements about the reaction of hydrogen bromide with 2-methylpropene are correct? I. A tertiary carbocation is formed as an intermediate. II. The major product is a primary halogenoalkane. III. The first step of the mechanism is attack of an…
Zadanie 40
Which of these reactions are nucleophilic substitutions? I. OH− + CH3CH2CH2Cl → CH3CH=CH2 + H2O + Cl− II. I− + CH3CH2Br → CH3CH2I + Br− III. CH3O− + CH3CH2Cl → CH3CH2OCH3 + Cl− A. I and II only B. I and III only C. II and III only D. I,…