Zadanie 1
What is the number of hydrogen atoms in 0.0500 mol of hydrated magnesium sulfate, MgSO4 ⋅ 7 H2O? A. 3.01 × 1022 B. 4.21 × 1023 C. 2.11 × 1023 D. 4.21 × 1022
Chemistry HL Paper 1A, May 2025, TZ3
Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 40 zadań z tego arkusza, razem 40 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Reacting masses, volumes and concentrations (2), pH scale and hydrogen ion concentration (2).
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Dodaj cały arkusz do zestawuZadanie 2
Which of the following could be the empirical formula of a compound with Mr = 70? I. CH2 II. C4H6O III. C5H10 A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 3
What volume of propane gas, in cm3, must be burned completely in oxygen to give 90 cm3 of carbon dioxide, all volumes being measured at the same temperature and pressure? C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(g) A. 18 B. 30 C. 90 D.…
Zadanie 4
The mass spectrum of a sample of an element shows two peaks. What is the relative atomic mass of the element? A. 6.1 B. 6.5 C. 6.9 D. 7.0
- Materiał graficzny
Zadanie 5
How many electrons, at most, can be held in the fifth main energy level (n = 5) of an atom? A. 10 B. 25 C. 32 D. 50
Zadanie 6
Calcium ions and phosphate(V) ions combine to form an ionic compound. What is its formula? A. CaPO4 B. Ca2(PO4)3 C. Ca3(PO4)2 D. Ca3(PO3)2
Zadanie 7
A white crystalline solid has the properties shown in the table. Which structure is consistent with these properties? A. Giant metallic lattice B. Giant covalent network C. Molecular covalent solid D. Giant ionic lattice
- Tabela do uzupełnienia
Zadanie 8
Hydrogen fluoride boils at 20 °C, whereas hydrogen chloride boils at −85 °C. Which type of intermolecular force accounts for the much higher boiling point of hydrogen fluoride? A. Hydrogen bonding B. Dipole-dipole forces C. London (dispersion) forces D.…
Zadanie 9
The Lewis formula of the chlorate(VII) ion, ClO4−, can be drawn with four single Cl–O bonds, as shown. What is the formal charge of the chlorine atom in this Lewis formula? A. −1 B. +1 C. +3 D. +7
- Materiał graficzny
Zadanie 10
Which hybridization is shown by the carbon atom and by the nitrogen atom in hydrogen cyanide, HCN? A. C: sp, N: sp B. C: sp, N: sp2 C. C: sp2, N: sp D. C: sp2, N:…
Zadanie 11
Which list arranges the metals in order of increasing strength of metallic bonding (weakest first)? A. Rb, Mg, Na, Al B. Al, Mg, Na, Rb C. Rb, Na, Mg, Al D. Na, Rb, Al, Mg
Zadanie 12
Which element belongs to the f-block of the periodic table? A. Nd B. Fr C. Ta D. Pb
Zadanie 13
Which electron configuration is correct for a chromium atom, Cr, in its ground state? A. [Ar] 4s1 3d5 B. [Ar] 4s2 3d4 C. [Ar] 3d6 D. [Ar] 4s2 4d4
Zadanie 14
Which pair of elements reacts together most vigorously? A. Sodium and bromine B. Potassium and bromine C. Sodium and chlorine D. Potassium and chlorine
Zadanie 15
In which species does an atom have the oxidation state +5? I. IF5 II. H3PO4 III. N2O4 A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 16
An aqueous solution of nickel(II) sulfate, which contains the [Ni(H2O)6]2+ ion, is green. Which statement explains the origin of this colour? A. Red light is absorbed when electrons are promoted between the split d orbitals of the nickel ion. B. Red…
Zadanie 17
Which two functional groups occur in both molecule P and molecule Q? A. Amino and a benzene ring B. Hydroxyl and ester C. Hydroxyl and a benzene ring D. Amino and hydroxyl
- Materiał graficzny
Zadanie 18
The NMR spectrum of an alcohol with molecular formula C5H11OH shows four signals with relative areas 6 : 4 : 1 : 1. Which alcohol is it? A. Pentan-1-ol B. Pentan-3-ol C. 2-methylbutan-2-ol D. 2,2-dimethylpropan-1-ol
Zadanie 19
How many chiral centres does the molecule shown contain? A. 1 B. 2 C. 3 D. 4
- Materiał graficzny
Zadanie 20
Which row correctly describes an endothermic reaction? A. The temperature of the surroundings rises and the products are more stable than the reactants. B. The temperature of the surroundings falls and the products are more stable than the reactants. C. The…
Zadanie 21
When 0.601 g of propan-1-ol is burned, the heat released raises the temperature of 250 cm3 of water by 8.00 K. What is the enthalpy of combustion of propan-1-ol, in kJ mol−1, calculated from these results? Specific heat capacity of…
Zadanie 22
The diagram shows an energy cycle for the formation of solid potassium bromide from its elements. Which energy change in the cycle represents the first ionization energy of potassium? A. ΔH2 B. ΔH4 C. ΔH5 D. ΔH6
- Materiał graficzny
Zadanie 23
For which of these changes is ΔS negative? A. 2 SO2(g) + O2(g) → 2 SO3(g) B. NaNO3(s) → NaNO3(aq) C. Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g) D. CuCO3(s) → CuO(s) + CO2(g)
Zadanie 24
A reaction is spontaneous at low temperatures but becomes non-spontaneous when the temperature is raised. Which combination of signs of ΔH and ΔS is consistent with this behaviour? A. ΔH > 0 and ΔS > 0 B. ΔH < 0 and…
Zadanie 25
Which route to chloroethane has an atom economy of 100 %? A. C2H5OH + PCl5 → C2H5Cl + POCl3 + HCl B. C2H6 + Cl2 → C2H5Cl + HCl C. C2H5OH + HCl → C2H5Cl + H2O D. C2H4 + HCl → C2H5Cl
Zadanie 26
Which of the following could be used to follow the progress of the reaction between calcium carbonate and dilute nitric acid? CaCO3(s) + 2 HNO3(aq) → Ca(NO3)2(aq) + H2O(l) + CO2(g) I. A balance recording the mass of the open flask and its contents II. A…
Zadanie 27
The table shows how the initial rate of the reaction between X and Y depends on the concentrations of the reactants. What is the order of reaction with respect to each reactant? A. X: 1, Y: 1 B. X: 2, Y: 1 C. X: 1, Y: 2 D. X: 2, Y: 0
- Tabela do uzupełnienia
Zadanie 28
A reaction has the rate equation below. What are the units of the rate constant k? rate = k[A]2[B][C]0 A. s−1 B. mol−1 dm3 s−1 C. mol−2 dm6 s−1 D.…
Zadanie 29
Iron(III) ions and thiocyanate ions form a deep red complex ion in aqueous solution. Fe3+(aq) + SCN−(aq) ⇌ [Fe(SCN)]2+(aq) Which of the following correctly predicts the effect of a change on this equilibrium? A. Adding iron(III) nitrate solution…
Zadanie 30
What amount of oxygen, in mol, is required to burn 8.72 g of butane, C4H10(g), completely? M(butane) = 58.14 g mol−1 A. 0.0231 B. 0.150 C. 0.975 D. 1.95
Zadanie 31
What is the pH of a 0.020 mol dm−3 solution of nitric acid, HNO3(aq)? A. 1.0 B. 1.7 C. 2.0 D. 12.3
Zadanie 32
Which of these solutions has a pH greater than 7 at 25 °C? A. [H+] = 1.0 × 10−5 mol dm−3 B. [OH−] = 1.0 × 10−10 mol dm−3 C. [H3O+] = 1.0 × 10−11 mol dm−3 D.…
Zadanie 33
Which equation correctly represents a reaction of dilute sulfuric acid? A. H2SO4 + MgCO3 → MgSO4 + CO2 + H2O B. H2SO4 + 2 Ag → Ag2SO4 + H2 C. H2SO4 + 2 KOH → K2SO4 + H2 D. H2SO4 + 2 NaHCO3 → Na2SO4 + 2 H2O
Zadanie 34
The table gives data for four bases at 298 K. Which base has the weakest conjugate acid? A. N2H4 B. C2H5NH2 C. C6H5NH2 D. C5H5N
- Tabela do uzupełnienia
Zadanie 35
A buffer solution contains propanoic acid at 0.300 mol dm−3 and sodium propanoate at 0.600 mol dm−3. What is its pH? pKa(propanoic acid) = 4.87 A. 4.57 B. 4.87 C. 5.17 D. 5.47
Zadanie 36
Cadmium was added to separate solutions of silver nitrate and chromium(III) nitrate. Cd(s) + 2 AgNO3(aq) → Cd(NO3)2(aq) + 2 Ag(s) Cd(s) + Cr(NO3)3(aq): no reaction Which list places the three metals in order from most reactive to least reactive?…
Zadanie 37
Molten lead(II) bromide, PbBr2(l), is electrolysed using inert electrodes. Which products form at the electrodes? A. Anode: Br2, cathode: Pb B. Anode: O2, cathode: Pb C. Anode: Pb, cathode: Br2 D. Anode:…
Zadanie 38
Reduction of which compound gives pentan-2-ol? A. Pentan-2-one B. Pentan-3-one C. Pentanal D. Pentanoic acid
Zadanie 39
The table shows standard electrode potentials for three metals. Which combination undergoes a spontaneous reaction under standard conditions? A. Cd and Cr3+ B. Cr and Cd2+ C. Cr and Mn2+ D. Cd and Mn2+
- Tabela do uzupełnienia
Zadanie 40
Which species can act as the electrophile in a substitution reaction with benzene? A. Br− B. Na+ C. OH− D. Br+