Zadanie 1
Which methods for separating the components of the given mixtures are correct? A. I and II only B. I and III only C. II and III only D. I, II and III
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Chemistry SL Paper 1A, November 2025, TZ1
Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 30 zadań z tego arkusza, razem 30 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Enthalpy change from bond enthalpies (3), Limiting reactant and theoretical yield (3).
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Dodaj cały arkusz do zestawuZadanie 2
What is the number of subatomic particles in ? A. Protons: 40, neutrons: 50, electrons: 36 B. Protons: 38, neutrons: 50, electrons: 36 C. Protons: 38, neutrons: 88, electrons: 40 D. Protons: 40, neutrons: 88, electrons: 40
Zadanie 3
The diagrams show the 3s and 3p sublevels of a sulfur atom; the inner sublevels are full. Which diagram represents the ground-state electron configuration, in agreement with the Pauli exclusion principle and Hund's rule? A. Diagram A B. Diagram B C. Diagram C…
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Zadanie 4
4.06 g of hydrated magnesium chloride, MgCl2 ⋅ 6 H2O (Mr = 203), is dissolved in water to make 0.250 dm3 of solution. What is the concentration of chloride ions, in mol dm−3, in this solution? A. 0.0400 B. 0.0800 C.…
Zadanie 5
Under which conditions does the gas behave most like an ideal gas? A. Helium at 200 kPa and 300 K B. Helium at 20 kPa and 600 K C. Sulfur dioxide at 20 kPa and 600 K D. Sulfur dioxide at 200 kPa and 300 K
Zadanie 6
Part of the lattice of potassium bromide, KBr, is shown in an expanded view. Which statement about the lattice of potassium bromide is correct? A. Each bromide ion is in contact with six potassium ions. B. Neighbouring ions are held together by shared pairs of…
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Zadanie 7
What are the electron domain geometry and the molecular geometry of sulfur dioxide, SO2? A. Electron domain geometry: trigonal planar; molecular geometry: bent B. Electron domain geometry: trigonal planar; molecular geometry: trigonal planar C. Electron…
Zadanie 8
Which substance has dipole-dipole forces between its molecules? A. CO2 B. Cl2 C. CH4 D. CH3Cl
Zadanie 9
Which statement best explains why aluminium can be drawn into thin wires? A. The delocalized electrons carry charge through the metal. B. The layers of aluminium ions can slide over each other while the delocalized electrons keep the lattice bonded. C.…
Zadanie 10
Which substance is a good conductor of electricity in the solid state? A. Graphene B. Diamond C. Silicon dioxide D. Silicon
Zadanie 11
A section of a polymer containing three repeating units is shown. Which monomer was used to make this polymer? A. 1,1-dichloroethene B. Chloroethene C. 1,2-dichloroethene D. 3-chloroprop-1-ene
- Materiał graficzny
Zadanie 12
What are the oxidation states of the elements in K2MnO4? A. K: +1, Mn: +6, O: −2 B. K: +1, Mn: +7, O: −2 C. K: +2, Mn: +4, O: −2 D. K: +1, Mn: +6, O: −1
Zadanie 13
What is the IUPAC name of the compound shown? A. 3-methylhexan-4-one B. 4-methylhexan-3-one C. 4-ethylpentan-3-one D. 2-ethylpentan-3-one
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Zadanie 14
The first ionization energies of four elements with consecutive atomic numbers, A, B, C and D, are shown. An element X reacts with oxygen to form an acidic oxide. Which element could be X? A. A B. B C. C D. D
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Zadanie 15
Which formula represents an amide? A. CH3CH2NH2 B. CH3CH2CONH2 C. (C2H5)2NH D. H2NCH2CH2COOH
Zadanie 16
The potential energy profile of a reaction is shown. Which reaction has this energy profile? A. Cl2(g) → 2 Cl(g) B. CaCO3(s) → CaO(s) + CO2(g) C. N2O4(g) → 2 NO2(g) D. 2 Mg(s) + O2(g) → 2 MgO(s)
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Zadanie 17
What is ΔH, in kJ, in the energy cycle below? A. +20 - 165 B. +20 + 165 C. -20 + 165 D. -20 - 165
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Zadanie 18
Which statement best describes an environmental consequence of using fossil fuels? A. The carbon dioxide released is completely absorbed by the oceans, so its concentration in the atmosphere does not change. B. Coal has a higher hydrogen to carbon ratio than…
Zadanie 19
Equal volumes of the gases Q2 and R2 are mixed in a sealed container and react until one of them is used up, forming the gas QR2. The volume of QR2 formed, measured under the same conditions, is 50 cm3.…
Zadanie 20
What volume of hydrogen, in cm3, is produced at STP when 0.810 g of aluminium reacts with an excess of hydrochloric acid? 2 Al(s) + 6 HCl(aq) → 2 AlCl3(aq) + 3 H2(g) Molar volume of an ideal gas at STP = 22.7 dm3 mol−1 A. 341 B.…
Zadanie 21
Nitrogen gas is reacted with excess hydrogen gas to produce ammonia. N2(g) + 3 H2(g) → 2 NH3(g) The reaction of 28.0 g of N2 with excess H2 produces 25.5 g of NH3. What is the percentage yield of NH3? A. 25% B. 50% C. 75% D.…
Zadanie 22
The dotted line shows the volume of hydrogen produced when an excess of magnesium ribbon is added to 50 cm3 of 2.0 mol dm−3 hydrochloric acid. Which curve shows the volume of hydrogen produced when the same excess of magnesium ribbon…
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Zadanie 23
Which reaction has the lowest activation energy? A. HBr(g) → H(g) + Br(g) B. 2 Cl(g) → Cl2(g) C. CH4(g) + Cl(g) → CH3(g) + HCl(g) D. HBr(g) → H+(g) + Br−(g)
Zadanie 24
Which statement explains why a chemical equilibrium is described as dynamic? A. The forward and reverse reactions continue to take place at equal rates. B. The concentrations of the reactants and products keep changing until the reaction stops. C. The position…
Zadanie 25
In which reaction does water behave as a Brønsted–Lowry acid? A. H2O(l) + HCl(g) → H3O+(aq) + Cl−(aq) B. H2O(g) + SO3(g) → H2SO4(l) C. 2 H2O(l) → 2 H2(g) + O2(g) D. H2O(l) + NH3(aq) → NH4+(aq) + OH−(aq)
Zadanie 26
Which compounds are oxidized when heated with acidified potassium dichromate(VI) solution? I. CH3CH2C(CH3)2OH II. (CH3)2CHCH2OH III. CH3CH(OH)CH3 A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 27
Magnesium is a stronger reducing agent than lead. A voltaic cell is constructed using magnesium and lead electrodes dipped into solutions of their respective ions, Mg2+(aq) and Pb2+(aq), of equal concentrations. What is correct when the…
Zadanie 28
Which half-equation represents the reduction of sulfuric acid to sulfur dioxide in acidic solution? A. H2SO4 + 2 H+ + 2 e− → SO2 + 2 H2O B. H2SO4 + 4 H+ + 4 e− → SO2 + 2 H2O C. H2SO4 + 2 H2O → SO2 + 6 H+ + 2 e− D.…
Zadanie 29
Which radical is most likely to form when one covalent bond in bromochlorodifluoromethane, CBrClF2, is broken by ultraviolet light in the upper atmosphere? A. •CBrF2 B. •CClF2 C. •CBrClF D. •CBrClF2
Zadanie 30
Pent-2-ene undergoes a range of addition reactions. Which reagent and product are correctly matched? A. Reagent H2, product pent-1-ene B. Reagent Br2, product 2,3-dibromopentane C. Reagent H2O, product pentan-1-ol D. Reagent HBr,…