Zadanie 1
What is correct about the species ? A. 65 protons, 65 neutrons, 63 electrons B. 30 protons, 35 neutrons, 28 electrons C. 30 protons, 65 neutrons, 28 electrons D. 65 protons, 35 neutrons, 63 electrons
Chemistry HL Paper 1A, May 2026, TZ1
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What will be the volume of 4.00 dm3 of gas that has had the pressure decreased from 150 kPa to 50.0 kPa, and its temperature increased from 27.0 °C to 127 °C? A. 16.0 dm3 B. 12.0 dm3 C. 56.4 dm3 D. 1.78 dm3
Zadanie 3
What is the correct electron configuration of the selenium atom? A. 1s22s22p63s23p63d104s24p4 B. 1s22s22p62d103s23p64s24p4 C. 1s22s22p63s23p63d104s24p6 D. 1s22s22p63s23p63d84s24p6
Zadanie 4
Successive ionization energies of an element: Which element has these successive ionization energies? A. Sodium B. Magnesium C. Aluminium D. Silicon
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Zadanie 5
How many ions are present in 142 g of Na2SO4? M(Na2SO4) = 142 g mol−1 A. 1 B. 3 C. 6.02 × 1023 D. 1.81 × 1024
Zadanie 6
What is the empirical formula of an alcohol with 60.0 % mass carbon and 13.4 % mass hydrogen? A. C3H7 B. C6H16O2 C. C3H8O D. C2H6O
Zadanie 7
Which properties are expected for the compound lithium bromide? A. Not soluble in water, low melting point, does not conduct electricity when solid, does not conduct electricity when molten B. Not soluble in water, low melting point, conducts electricity when…
Zadanie 8
What is the correct electron domain geometry and molecular geometry of SF4? A. Trigonal bipyramidal electron domain geometry, trigonal bipyramidal molecular geometry B. Trigonal bipyramidal electron domain geometry, seesaw molecular geometry C.…
Zadanie 9
Which species contains a coordination bond? A. BCl3 B. PH3 C. [NH4]+ D. HCOO−
Zadanie 10
Which molecules are polar? I. CHCl3 II. CH2F2 III. CF4 A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 11
How many sigma and pi bonds are present in pent-1-yne, C5H8? A. 12 sigma bonds and 2 pi bonds B. 8 sigma bonds and 3 pi bonds C. 13 sigma bonds and 1 pi bond D. 9 sigma bonds and 4 pi bonds
Zadanie 12
Which classification is correct? A. Alkali metal: rubidium; transition element: platinum; halogen: xenon; noble gas: bromine B. Alkali metal: rubidium; transition element: platinum; halogen: bromine; noble gas: xenon C. Alkali metal: platinum; transition…
Zadanie 13
Which oxide will react with water to produce the most basic solution? A. Potassium oxide B. Calcium oxide C. Sulfur trioxide D. Nitrogen dioxide
Zadanie 14
Which functional groups are present in this molecule? A. Secondary amine, hydroxyl, alkoxy B. Tertiary amine, alcohol, ketone C. Tertiary amine, hydroxyl, alkoxy D. Secondary amine, alcohol, ketone
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Zadanie 15
Which of these molecules are isomers of each other? I. Butanal II. 2-methylpropan-1-ol III. Butan-2-ol A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 16
The table shows the observed colour of three octahedral complex ions formed by the same metal ion, M2+, with different ligands. Which statement about these complex ions and their colours is correct? A. Splitting of the d-orbitals is greatest in…
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Zadanie 17
Which molecules exhibit cis-trans isomerism? I. Pent-2-ene II. 1,1-dichloroethene III. 1,2-dibromoethene A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 18
Which compound could produce this mass spectrum? A. Butanone B. Butanal C. Butan-1-ol D. Butan-2-ol
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Zadanie 19
Which classification is correct for this reaction? 2 Mg(s) + CO2(g) → 2 MgO(s) + C(s), heat is released A. Endothermic; temperature decreases; reactants more stable B. Exothermic; temperature decreases; products more stable C. Exothermic; temperature…
Zadanie 20
What is the sum of the coefficients when this equation is balanced with the smallest whole numbers? A. 20 B. 37 C. 47 D. 53
Zadanie 21
Given the following data: CaO(s) + CO2(g) → CaCO3(s) ΔH = −p kJ 2 Ca(s) + O2(g) → 2 CaO(s) ΔH = −q kJ 2 CaCO3(s) → 2 Ca(s) + 2 C(s) + 3 O2(g) ΔH = +r kJ What is the ΔH of the…
Zadanie 22
In which reaction will there be a decrease in entropy? A. NH4NO3(s) → NH4NO3(aq) B. CaCO3(s) → CaO(s) + CO2(g) C. 2 H2(g) + O2(g) → 2 H2O(l) D. N2O4(g) → 2 NO2(g)
Zadanie 23
What is the effect of decreasing temperature on this Maxwell-Boltzmann energy distribution curve? A. The curve maximum is higher and to the left of A. B. The curve maximum is lower and to the right of A. C. The curve maximum is higher and to the right of A. D.…
- Materiał graficzny
Zadanie 24
Which volume of oxygen is required to react fully with 40.0 cm3 of butane to ensure complete combustion? 2 C4H10(g) + 13 O2(g) → 8 CO2(g) + 10 H2O(g) A. 520 cm3 B. 260 cm3 C. 130 cm3 D. 40.0 cm3
Zadanie 25
Which substances will be present in the reaction vessel at the end of the reaction between 1.5 g of magnesium and 50.0 cm3 of 1.0 mol dm⁻³ hydrochloric acid? Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) A. HCl(aq), MgCl2(aq) B. Mg(s),…
Zadanie 26
Which of these changes will increase the time taken for this reaction to go to completion? Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g) A. Increase the temperature B. Increase the concentration of H2SO4 C. Use powdered zinc instead of zinc granules D.…
Zadanie 27
Which change would shift the position of this equilibrium towards the products? H2(g) + I2(g) ⇌ 2 HI(g) ΔH = −9 kJ mol−1 A. Increase pressure B. Decrease pressure C. Increase temperature D. Decrease temperature
Zadanie 28
What can be deduced about this equilibrium reaction from these data? A(g) + B(g) ⇌ 2 C(g) A. It is an exothermic reaction and [products] < [reactants] at equilibrium. B. It is an endothermic reaction and [products] < [reactants] at equilibrium. C. It…
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Zadanie 29
What does the pre-exponential (Arrhenius) factor, A, represent in the Arrhenius equation ? A. The frequency of collisions with the correct orientation B. The activation energy of the reaction C. The overall rate constant of the reaction D.…
Zadanie 30
Which combination of substances is correctly used for electroplating an iron object with tin using an electrolytic cell? A. X: tin, Y: iron, Z: tin(II) sulfate solution B. X: iron, Y: tin, Z: tin(II) sulfate solution C. X: tin, Y: iron, Z: iron(II) sulfate…
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Zadanie 31
Which of these salts, when dissolved in water to make solutions of equal concentration, has the highest pH? A. KCl B. NaHCO3 C. NH4Br D. NH4HCO3
Zadanie 32
Which statement about this reaction is correct? 2 Cl2 + O2 → 2 Cl2O A. Chlorine is the reducing agent. B. Oxygen is the reducing agent. C. Chlorine is reduced. D. Oxygen is oxidized.
Zadanie 33
Which of these reactions will occur spontaneously? I. KI + Br2 II. KBr + Cl2 III. KCl + Br2 A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 34
Which combination is correct for this cell, when nickel is more reactive than silver? A. Cathode: silver; anode: nickel; sign on cathode: -; sign on anode: + B. Cathode: nickel; anode: silver; sign on cathode: -; sign on anode: + C. Cathode: nickel; anode:…
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Zadanie 35
Which products are produced at the electrodes by the electrolysis of aqueous sodium iodide? A. Product at cathode: sodium; product at anode: iodine B. Product at cathode: hydrogen; product at anode: iodine C. Product at cathode: iodine; product at anode:…
Zadanie 36
Which statement explains the Lewis acid-base nature of the carbocation in this reaction? C2H5+ + I− → C2H5I A. Lewis base because it accepts a pair of electrons B. Lewis base because it donates a pair of electrons C. Lewis acid because it donates a…
Zadanie 37
Which equation shows the first species acting as an electrophile? A. Br− + CH3CH2+ → CH3CH2Br B. H2O + H+ → H3O+ C. CN− + CH3Br → CH3CN + Br− D. AlCl3 + Cl− → AlCl4−
Zadanie 38
What can react with benzene to produce nitrobenzene? A. NO2 B. NO3− C. NO2+ D. NO+
Zadanie 39
Which reaction will be fastest when a halogen is substituted by aqueous hydroxide ions? A. (CH3)2C(F)CH2CH2CH3 B. (CH3)2C(Cl)CH2CH2CH3 C. (CH3)2C(Br)CH2CH2CH3 D. (CH3)2C(I)CH2CH2CH3
Zadanie 40
What is the charge on this complex ion of chromium(III), [Cr(H2O)4Cl2]×? A. 1+ B. 3+ C. 5+ D. 1-