Zadanie 1
Ethane burns completely in oxygen to give carbon dioxide and water. C2H6(g) + O2(g) → CO2(g) + H2O(l) What is the C2H6 : O2 mole ratio in the balanced equation, written with the smallest whole-number coefficients? A. 1:3 B. 2:5 C. 2:7 D.…
Chemistry HL Paper 1, November 2023, TZ1
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Dodaj cały arkusz do zestawuZadanie 2
Metal M reacts with 8.00 g of oxygen to produce 28.0 g of the oxide MO2. What is the relative atomic mass of M? A. 20 B. 40 C. 80 D. 160
Zadanie 3
A mixture of 44.1 g of propane and 192 g of oxygen is ignited and reacts until one reactant is used up, according to the equation. C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(l) Which substances are present in the vessel once the reaction has finished? A.…
Zadanie 4
Thallium (Ar = 204.38) consists of two stable isotopes, and . What is the relative abundance of ? A. 31 % B. 38 % C. 62 % D. 69 %
Zadanie 5
The first three ionization energies of two elements, X and Y, are given in the table. Which pair of elements are X and Y, in that order? A. Aluminium and magnesium B. Magnesium and aluminium C. Sodium and magnesium D. Sodium and aluminium
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Zadanie 8
Which solutions would show a wavelength of maximum absorbance different from that of 0.10 mol dm−3 CuSO4(aq)? I. 0.010 mol dm−3 CuSO4 II. 0.10 mol dm−3 Cu(NO3)2 III.…
Zadanie 9
Which species is best described by resonance structures? A. NO3− B. COCl2 C. CH3OH D. PF3
Zadanie 10
Which substance evaporates easily when pure and gives a strongly conducting solution in water? A. HBr B. KBr C. CH3Br D. NH3
Zadanie 11
Which substance has no intermolecular attraction other than London (dispersion) forces? A. ClF3 B. IF5 C. SeO2 D. SF6
Zadanie 12
Which Lewis structure of SO2Cl2 is preferred on the basis of formal charges? A. Diagram A B. Diagram B C. Diagram C D. Diagram D
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Zadanie 13
What are the hybridization of the carbon atom in carbon dioxide and the O-C-O bond angle? A. sp2 and 120° B. sp3 and 109.5° C. sp and 90° D. sp and 180°
Zadanie 14
Which changes are exothermic? I. CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l) II. Cl(g) + e− → Cl−(g) III. H2O(l) → H2O(g) A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 15
Which expression gives the value of ΔH⊖, in kJ, for the formation of one mole of NO2(g) from its elements, ? A. −180 + 114 B. 0.5 × (−180) + 0.5 × 114 C. 0.5 × 180 − 0.5 × 114 D. 0.5 × 180 + 0.5 × 114
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Zadanie 16
The diagram shows the enthalpy profile of an exothermic reaction. Arrows I, II and III show energy differences on the profile. Which expression gives ΔH for the forward reaction? A. II − I B. I − II C. I + II D. III − II
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Zadanie 18
Which combination of signs of ΔH and ΔS belongs to a reaction that is not spontaneous at low temperatures but becomes spontaneous at high temperatures? A. ΔH positive and ΔS positive B. ΔH negative and ΔS…
Zadanie 19
Which statement correctly explains why a reaction is faster when a catalyst provides an alternative reaction pathway? A. It raises the average kinetic energy of the reacting particles. B. It lowers the activation energy, so a greater proportion of collisions…
Zadanie 20
The rate of the reaction 4 PH3(g) → P4(g) + 6 H2(g) can be expressed as the rate of change of the concentration of P4 with respect to time, Δ[P4]/Δt. Which expression is numerically equal to this rate? A.…
Zadanie 21
A proposed mechanism for the reaction between nitrogen(II) oxide and hydrogen, which is overall exothermic, is shown. Which profile is consistent with this mechanism? A. Profile A B. Profile B C. Profile C D. Profile D
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Zadanie 22
The temperature of a reaction mixture is raised from 300 K to 320 K and nothing else is changed. Which quantity increases? A. Activation energy, Ea B. Rate constant, k C. Standard enthalpy change of the reaction, ΔH⊖ D. Order of…
Zadanie 23
Which change would increase the amount of CO(g) in the equilibrium mixture below? CH4(g) + H2O(g) ⇌ CO(g) + 3 H2(g) ΔH⊖ = +206 kJ A. Adding a catalyst to the system B. Decreasing the volume of the reaction vessel C.…
Zadanie 24
The system 2 A(g) ⇌ 3 B(g) + C(g) is at equilibrium, and the concentrations of A, B and C are all 3 mol dm−3. What is Kc for this system? Ignore units. A. 0.11 B. 3 C. 9 D. 27
Zadanie 26
Equal volumes (20.0 cm3 each) of two solutions are mixed. Which pair gives a buffer solution? A. 0.20 mol dm−3 CH3COOH and 0.10 mol dm−3 NaOH B. 0.10 mol dm−3 CH3COOH and…
Zadanie 27
Which titration produces the pH curve shown? A. Strong acid added to a strong base B. Weak acid added to a strong base C. Strong base added to a weak acid D. Strong acid added to a weak base
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Zadanie 28
A 0.010 mol dm−3 solution of a weak acid has Ka = 1.0 × 10−6. What is its pH? A. 2 B. 4 C. 6 D. 8
Zadanie 29
Zinc reacts with an aqueous solution of ethanoic acid. Zn(s) + 2 CH3COOH(aq) → Zn(CH3COO)2(aq) + H2(g) Which combination shows the role of the acid and the gas formed? A. oxidizing agent, H2(g) B. oxidizing agent, CO2(g) C. reducing agent,…
Zadanie 30
What are the products at the electrodes in the electrolysis of 1.0 mol dm−3 aqueous copper(II) sulfate using inert electrodes? A. H2(g) at the cathode and O2(g) at the anode B. Cu(s) at the cathode and SO2(g) at the…
Zadanie 32
How are the amine and the alcohol shown classified? A. primary amine and primary alcohol B. tertiary amine and secondary alcohol C. primary amine and secondary alcohol D. secondary amine and secondary alcohol
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Zadanie 33
2-Methylpropan-1-ol is heated with an acidified oxidizing agent and the first product is distilled off as it forms. What is this product? A. (CH3)2CHCOOH B. (CH3)2CHCHO C. (CH3)2CHCH2OH D. CH3COCH2CH3
Zadanie 34
Which compound is the major product of the reaction between hydrogen bromide and 2-methylbut-1-ene, CH2=C(CH3)CH2CH3? A. 1-bromo-2-methylbutane B. 2-bromo-3-methylbutane C. 1,2-dibromo-2-methylbutane D. 2-bromo-2-methylbutane
Zadanie 37
A student determines the concentration of an ethanoic acid solution by titration against standard NaOH(aq) from a burette. Which action would introduce a systematic error? A. Reading the burette at slightly different eye levels in each trial B. Using a…
Zadanie 38
A fixed amount of magnesium reacts with hydrochloric acid, which is added in increasing amounts. After each addition the reaction is allowed to finish. Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) Which graph shows how the amount of hydrogen formed changes…
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Zadanie 39
Separate pure samples of the two enantiomers of 2-chlorobutane are available. Which measurement can be used to distinguish between them? A. Boiling point B. Direction in which each rotates plane-polarized light C. Infrared spectrum D. 1H NMR spectrum in an…
Zadanie 40
Which compound produces the high resolution 1H NMR spectrum shown? A. Propanone B. Butanal C. Butanone D. Pentan-3-one
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