Zadanie 1
Dark crystals of iodine form on a cold glass surface placed in warm iodine vapour. No liquid is seen at any stage. What is the name of this change of state? A. Deposition B. Sublimation C. Condensation D. Freezing
Chemistry SL Paper 1A, May 2026, TZ2
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Dodaj cały arkusz do zestawuZadanie 2
Bromine (Ar = 79.90) consists of two isotopes, and . What is the relative abundance of ? A. 10 % B. 45 % C. 55 % D. 90 %
Zadanie 3
Which species has the ground state electron configuration [Ar] 3d8? A. Cu2+ B. Zn2+ C. Ni D. Ni2+
Zadanie 4
Which main energy level can hold a maximum of 50 electrons? A. n = 5 B. n = 4 C. n = 6 D. n = 25
Zadanie 5
Methane behaves almost as an ideal gas at room temperature and atmospheric pressure. Under which conditions would the molar volume of methane deviate most from the value predicted for an ideal gas? A. Low temperature and high pressure B. Low temperature and…
Zadanie 6
Which compounds contain ionic bonds? I. SiO2 II. CH3COONa III. MgO A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 7
The structure of dimethylamine, (CH3)2NH, is shown. What are the molecular geometries around a carbon atom and around the nitrogen atom? In each option the geometry around carbon is given first and the geometry around nitrogen second. A. Trigonal…
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Zadanie 8
The three isomers of C4H8O in the table have the same molar mass. What is the reason for the increase in boiling points? A. Increase in the number of covalent bonds per molecule B. Increase in molar mass C. Increase in the strength of intermolecular…
- Tabela do uzupełnienia
Zadanie 9
Which electrostatic attraction holds the two atoms together in a molecule of hydrogen, H2? A. Between the two nuclei B. Between the two electrons of the shared pair C. Between neighbouring hydrogen molecules D. Between each nucleus and the shared pair…
Zadanie 10
What is the formula of the compound formed from calcium ions and phosphate ions? A. CaPO4 B. Ca3(PO4)2 C. Ca2(PO4)3 D. Ca3PO4
Zadanie 11
The diagram shows an outline of the periodic table with four regions labelled A, B, C and D. An element has the ground state electron configuration [Ar] 3d7 4s2. In which region is it found? A. Region A B. Region B C. Region C D. Region D
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Zadanie 12
Why is the first ionization energy of potassium lower than that of sodium? A. Potassium has fewer protons in its nucleus than sodium B. The outer electron of potassium is in a higher main energy level, further from the nucleus and more shielded C. Potassium…
Zadanie 13
Why do halogens form 1− ions? A. Highly exothermic electron affinity, so the atoms gain one electron B. Low ionization energy, so the atoms lose one electron C. High ionization energy, so the atoms gain one electron D. Low electronegativity, so the atoms gain…
Zadanie 14
What is the correct classification of the molecule shown? A. Carboxylic acid B. Ketone C. Ether D. Ester
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Zadanie 15
Manganese(IV) oxide is added to a solution of hydrogen peroxide, which then decomposes much faster. Which quantity on the energy profile of the decomposition is the same with and without the catalyst? A. The activation energy of the forward reaction B. The…
Zadanie 16
Which of the following processes are exothermic? I. K(g) → K+(g) + e− II. H2O(g) → H2O(l) III. Ag+(g) + Cl−(g) → AgCl(s) A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 17
Ethane burns in a limited supply of oxygen. Which product is formed by incomplete combustion but not by complete combustion? A. CO2 B. CO C. H2O D. SO2
Zadanie 18
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;…
Zadanie 19
Aluminium sulfate reacts with barium chloride solution to form a precipitate of barium sulfate and an aqueous solution of aluminium chloride. Al2(SO4)3(aq) + BaCl2(aq) → AlCl3(aq) + BaSO4(s) What is the ratio of the coefficients of barium chloride to…
Zadanie 20
Sodium azide, NaN3 (Mr = 65.0), decomposes on heating to form sodium and nitrogen gas. 2 NaN3(s) → 2 Na(s) + 3 N2(g) What volume of nitrogen is produced from 26.0 g of sodium azide at STP? A. 6.05 dm3 B. 9.08 dm3…
Zadanie 21
Which statements describe the activation energy of a reaction? I. The minimum energy that colliding particles must have in order to react II. The energy difference between the reactants and the transition state on an energy profile III. The energy difference…
Zadanie 22
What is the equilibrium constant expression for the forward reaction? 2 SO2(g) + O2(g) ⇌ 2 SO3(g) A. B. C.…
Zadanie 23
How does an increase in pressure, at constant temperature, affect the position of the following equilibrium and the value of the equilibrium constant, Kc? N2O4(g) ⇌ 2 NO2(g) A. Shifts to the left; Kc is unchanged B. Shifts to…
Zadanie 24
Which products are formed when sulfuric acid, H2SO4(aq), reacts with solid magnesium carbonate, MgCO3(s)? A. MgSO4(s) and H2CO3(aq) B. MgSO4(aq), H2O(l) and CO2(g) C. MgSO4(s), H2O(l) and…
Zadanie 25
Sulfuric acid reacts with solid copper(II) oxide. Which salt is formed? A. CuSO3 B. CuSO4 C. Cu2SO4 D. H2O
Zadanie 26
What is the conjugate acid of the hydrogencarbonate ion, HCO3−? A. CO32− B. CO2 C. H2CO3 D. H3O+
Zadanie 27
Which species can act as both a Brønsted–Lowry acid and a Brønsted–Lowry base? A. NH4+ B. CO32− C. HPO42− D. Na+
Zadanie 28
How does the acidity of a solution change when its pH decreases from 5 to 2? A. Increases 3 times B. Increases 1000 times C. Decreases 3 times D. Decreases 1000 times
Zadanie 29
What happens to hydrogen in the following reaction? Each option states whether hydrogen is oxidized or reduced and the change in its oxidation state. Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) A. Oxidized, from +1 to 0 B. Oxidized, from 0 to +1 C. Reduced,…
Zadanie 30
A voltaic cell is represented by the cell diagram below. Which species is produced at the cathode? Ni(s) ∣ Ni2+(aq) ∣∣ Ag+(aq) ∣ Ag(s) A. Ni(s) B. Ni2+(aq) C. Ag+(aq) D. Ag(s)