Zadanie 1
A student mixes 100 cm3 of 0.50 mol dm−3 calcium chloride solution with 150 cm3 of 1.00 mol dm−3 potassium chloride solution. What is the concentration of chloride ions, in mol dm−3, in…
Chemistry SL Paper 1, May 2022, TZ2
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Dodaj cały arkusz do zestawuZadanie 2
A compound contains only carbon, hydrogen and oxygen. Complete combustion of 4.60 g of the compound produces 8.80 g of carbon dioxide and 5.40 g of water as the only products. Which is the empirical formula of the compound?…
Zadanie 3
Which graph represents the relationship between the pressure, P, and the volume, V, of a fixed amount of an ideal gas at constant temperature, according to PV = nRT? A. Graph A B. Graph B C. Graph C D. Graph D
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Zadanie 4
Which equation represents the sublimation of naphthalene, C10H8? A. C10H8(l) → C10H8(g) B. C10H8(s) → C10H8(l) C. C10H8(g) → C10H8(s) D. C10H8(s) → C10H8(g)
Zadanie 5
Which observation provides evidence that electrons in atoms occupy discrete energy levels? A. The line emission spectrum of hydrogen B. The deflection of alpha particles by a thin gold foil C. The existence of isotopes of an element D. The deflection of…
Zadanie 6
A sample of an element contains two isotopes. The table shows their mass numbers and their abundances. Which value is the relative atomic mass of the element? A. 40 B. 41 C. 42 D. 44
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Zadanie 7
Elements X, Y and Z are in the same period of the periodic table. The relative sizes of their atoms are shown below. Which row shows the correct general trends? A. Ionization energy: Z < Y < X; electronegativity: Z < Y < X; acidity of oxide, least to most…
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Zadanie 8
Which element is found in group 6 and period 5 of the periodic table? A. Chromium B. Molybdenum C. Tellurium D. Tungsten
Zadanie 9
Which statement best describes the bonding between the atoms inside one molecule of ammonia, NH3? A. Hydrogen bonding between nitrogen and hydrogen atoms B. Each shared pair of electrons is attracted electrostatically to the nuclei of both bonded atoms…
Zadanie 10
What is the type of bonding in a solid that is brittle, has a high melting point, does not conduct electricity when solid but conducts when molten? A. Ionic B. Molecular covalent C. Metallic D. Giant covalent
Zadanie 11
What is the name of the compound with the formula Cr2(SO4)3? A. Chromium sulfate B. Chromium(II) sulfate C. Chromium(III) sulfate D. Chromium(VI) sulfate
Zadanie 12
What is the main attraction between molecules in liquid carbon tetrachloride, CCl4? A. Hydrogen bonding B. Ionic attraction C. Dipole–dipole forces D. London (dispersion) forces
Zadanie 13
Which change is exothermic? A. Cl2(g) → 2 Cl(g) B. H2O(l) → H2O(g) C. CH4(g) → C(g) + 4 H(g) D. H(g) + Br(g) → HBr(g)
Zadanie 14
Which combination of ΔH1, ΔH2 and ΔH3 gives the enthalpy change of the reaction below? C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(l) ΔH1: C(s) + O2(g) → CO2(g) ΔH2: …
Zadanie 15
Identical pieces of zinc, each of mass 0.65 g, are added to two solutions of hydrochloric acid, X and Y, at the same initial temperature. Each reaction takes place in an identical insulated container and the mixture is stirred. Which statement is…
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Zadanie 16
Why does a powdered solid react faster with a dilute acid, at the same temperature, than a single lump of the same mass of the solid? A. Collisions between particles are more frequent. B. Collisions between particles are more energetic. C. The activation…
Zadanie 17
A reaction has an activation energy of 50 kJ mol−1 and an enthalpy change of −70 kJ mol−1. Which potential energy diagram represents this reaction? A. Graph A B. Graph B C. Graph C D. Graph D
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Zadanie 18
The equilibrium constant, Kc, for the reaction A + 2 B ⇌ 3 C + D has a value of 3.0 at a certain temperature. What is the value of Kc for the reaction below at the same temperature? 6 C + 2 D ⇌ 2 A + 4 B A. 0.11 B. 0.33 C. 1.5 D. 9.0
Zadanie 19
Which 0.0050 mol dm−3 solution is most likely to have a pH of 12.0 at 298 K, where Kw = 1.00 × 10−14? A. Ba(OH)2(aq) B. NaOH(aq) C. NH3(aq) D. H2SO4(aq)
Zadanie 20
What is the strongest base in the equilibrium below? NH3 + H2O ⇌ NH4+ + OH− Kc = 3.2 × 10−7 A. NH3 B. H2O C. NH4+ D. OH−
Zadanie 21
Which species could be reduced to form SO2? A. S8 B. H2S C. SO32− D. SO42−
Zadanie 22
Which combination best describes what is happening to propene, CH3CH=CH2, in the equation below? CH3CH=CH2(g) + H2(g) → CH3CH2CH3(g) A. Oxidation and addition B. Oxidation and substitution C. Reduction and addition D. Reduction and substitution
Zadanie 23
A battery is connected in a circuit. The arrows show the direction of electron flow. What does terminal X of the battery represent? A. Anode and positive terminal B. Anode and negative terminal C. Cathode and positive terminal D. Cathode and negative terminal
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Zadanie 24
How many structural isomers of dichloropentane, C5H10Cl2, can be formed by the free-radical substitution of CH3CH2CH2CH2CH3 with excess Cl2 in the presence of UV light? Ignore stereoisomers. A. 5 B. 7 C. 9 D. 12
Zadanie 25
Which structure represents a repeating unit of the polymer formed from chloroethene, CH2=CHCl? A. −CH2−CHCl− B. −CH2−CH2− C. −CHCl−CHCl− D. −CH2−CCl2−
Zadanie 26
Which set of formulas is a homologous series? A. CH4, C2H4, C3H4 B. C2H6, C3H6, C4H6 C. C3H8, C3H6, C3H4 D. C2H4, C3H6, C4H8
Zadanie 27
Which pair of reaction mechanisms is typical of the reaction of an alkene with bromine and of the reaction of bromoethane with aqueous sodium hydroxide, respectively? A. Electrophilic addition and electrophilic addition B. Electrophilic addition and…
Zadanie 29
The diagram shows part of the scale on a glass tube used to measure the volume of a liquid. The labelled marks are in cm3. What is the uncertainty, in cm3, of a reading taken with this scale? A. ±0.01 B. ±0.05 C. ±0.1 D. ±0.2
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Zadanie 30
A solution of barium hydroxide of concentration 0.10 mol dm−3 was added dropwise to 25 cm3 of copper(II) sulfate solution of concentration 0.10 mol dm−3 until 25 cm3 of the barium hydroxide solution had…
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