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 SL Paper 1A, May 2026, TZ3
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Dodaj cały arkusz do zestawuZadanie 2
Which statement about the ion is correct? A. It has the same number of neutrons as B. It has two more protons than C. It has the same number of protons as D. It has the same number of…
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 separated by thin layer chromatography. The chromatogram is shown. Which option is consistent with this chromatogram? A. RF of Y is 0.80; compound Y is more attracted to the mobile phase B. RF of X is…
- Materiał graficzny
Zadanie 9
Which list places the metals in order of increasing strength of metallic bonding, from weakest to strongest? A. Rb, K, Sr, Ca B. K, Rb, Ca, Sr C. Sr, Ca, Rb, K D. Ca, Sr, K, Rb
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
- Materiał graficzny
Zadanie 11
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 12
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 13
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
- Materiał graficzny
Zadanie 14
Which general formula describes a homologous series of unsaturated compounds? A. CnH2n+1OH B. CnH2n−2 C. CnH2n+1Br D. CnH2n+2
Zadanie 15
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
- Materiał graficzny
Zadanie 16
The enthalpy change for the combustion of propane is calculated from bond enthalpy data and compared with the literature value. C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(l) Which statement best explains why the calculated value is less negative than the…
- Tabela do uzupełnienia
Zadanie 17
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 18
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…
Zadanie 19
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 20
The graph shows how the concentration of reactant X changes with time in a reaction at constant temperature. X + Z → products How does the instantaneous rate of reaction with respect to X change between 20 s and 80 s? A. Decreases 4 times B. Decreases…
- Materiał graficzny
Zadanie 21
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 22
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 23
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 24
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 25
The pH of a dilute aqueous solution at 25 °C increases from 4.0 to 6.0. How do the concentrations of hydrogen ions and hydroxide ions change? A. [H+] decreases 100 times and [OH−] increases 100 times B. [H+] decreases 10 times and…
Zadanie 26
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 27
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 28
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 29
Which compound is most susceptible to attack by an electrophile? A. Butane, CH3CH2CH2CH3 B. 1-Chlorobutane, CH3CH2CH2CH2Cl C. But-2-ene, CH3CH=CHCH3 D. Cyclohexane, C6H12
Zadanie 30
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,…