Chemistry HL Paper 1, May 2022, TZ1

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 1

A 2.51 g sample of zinc carbonate is heated until it reaches constant mass. ZnCO₃(s) → ZnO(s) + CO₂(g) What is the mass of solid remaining? A. 0.88 g B. 1.63 g C. 2.51 g D. 3.39 g

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 2

A 0.030 mol sample of magnesium is added to 20.0 cm³ of hydrochloric acid of concentration 1.0 mol dm⁻³. Mg(s) + 2 HCl(aq) → MgCl₂(aq) + H₂(g) How many moles of hydrogen gas are produced? A. 0.010 B. 0.020 C. 0.030 D. 0.060

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 3

A 7.60 g sample of an oxide of nitrogen contains 4.80 g of oxygen. What is the empirical formula of the oxide? A. N₂O B. NO₂ C. N₂O₃ D. N₂O₅

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Zadanie 4

Bromine has two naturally occurring isotopes, $\ce{^{79}Br}$ and $\ce{^{81}Br}$. The relative atomic mass of bromine is 79.90. What is the approximate percentage abundance of $\ce{^{81}Br}$? A. 25 % B. 45 % C. 55 % D. 75 %

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 5

The graph shows the first six successive ionization energies of an element. In which group of the periodic table is the element? A. 13 B. 14 C. 15 D. 16

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Zadanie 6

Which oxides form an acidic solution when they react with water? I. sulfur trioxide II. phosphorus(V) oxide III. calcium oxide A. I and II only B. I and III only C. II and III only D. I, II and III

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 7

Which is the electron configuration of an atom of a metallic element? A. [He] 2s² 2p³ B. [Ne] 3s² 3p⁵ C. [Ar] 3d⁶ 4s² D. [Ar] 3d¹⁰ 4s² 4p⁴

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Zadanie 8

A solution of hydrated nickel(II) ions, [Ni(H₂O)₆]²⁺, is green. Which statement explains the colour? A. Green light is absorbed when electrons are promoted between d-orbitals B. Light complementary to green is absorbed when electrons are promoted…

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 9

A compound consists of Al³⁺ and SO₄²⁻ ions. What are the name and formula of the compound? A. Aluminium sulfite, Al₂(SO₃)₃ B. Aluminium sulfate, Al₃(SO₄)₂ C. Aluminium sulfide, Al₂S₃ D. Aluminium sulfate, Al₂(SO₄)₃

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 10

Which statement explains the high melting point of magnesium oxide? A. Strong covalent bonds between magnesium and oxygen atoms must be broken B. Strong intermolecular forces hold magnesium oxide molecules together C. A large amount of energy is needed to…

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Zadanie 11

For which species can resonance structures be drawn? A. CH₃CH₂OH B. CH₃CH₂O⁻ C. CH₃NH₃⁺ D. CH₃COO⁻

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Zadanie 12

In which compound are all the carbon atoms sp² hybridized? A. Buta-1,3-diene, CH₂=CH−CH=CH₂ B. Propene, CH₂=CH−CH₃ C. Propadiene, CH₂=C=CH₂ D. But-2-yne, CH₃−C≡C−CH₃

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 13

What are the electron domain geometry and the molecular geometry of the ClF₃ molecule? A. Electron domain geometry: octahedral; molecular geometry: trigonal planar B. Electron domain geometry: octahedral; molecular geometry: T-shaped C. Electron domain…

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Zadanie 14

Burning 0.500 g of propan-1-ol, CH₃CH₂CH₂OH, heats 200 g of water by 12.4 K. Specific heat capacity of water: 4.18 J g⁻¹ K⁻¹. What is the enthalpy of combustion of propan-1-ol, in…

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 15

What is the enthalpy change for the following reaction? CH₂=CHCH₃ + HCl → CH₃CHClCH₃ A. +73.0 kJ B. −73.0 kJ C. −165.3 kJ D. −216.8 kJ

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Zadanie 16

Which compound has the largest lattice enthalpy? A. MgBr₂ B. NaCl C. CaCl₂ D. MgCl₂

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 17

In which reaction does the entropy of the system decrease? A. 2 H₂(g) + O₂(g) → 2 H₂O(l) B. CaCO₃(s) → CaO(s) + CO₂(g) C. N₂O₄(g) → 2 NO₂(g) D. KNO₃(s) → K⁺(aq) + NO₃⁻(aq)

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamkniętetrudne (szac.)

Zadanie 18

Excess calcium carbonate reacts with 25 cm³ of hydrochloric acid of concentration 1.0 mol dm⁻³ in an open flask. The solid line shows how the decrease in mass of the flask and its contents changes with time. The experiment is…

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Zadanie 19

A student monitors the rate of a reaction using a colorimeter. In which mixture would the absorbance change as the reaction proceeds? A. NaOH(aq) + HNO₃(aq) B. KCl(aq) + I₂(aq) C. KI(aq) + Cl₂(aq) D. CH₃COOH(aq) + KOH(aq)

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamkniętetrudne (szac.)

Zadanie 20

The table shows initial rate data for the hydrolysis of a tertiary halogenoalkane, RBr, with aqueous sodium hydroxide at constant temperature. Which statements are correct? I. The reaction is first order with respect to hydroxide ions. II. The reaction is…

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Zadanie 21

The rate constant, k, of a reaction was measured at several temperatures, and ln k was plotted against $\dfrac{1}{T}$, where T is the temperature in kelvin. Two points on the line of best fit are marked on the graph.…

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Zadanie 22

At a certain temperature, K_c = 12 for the reaction $\ce{1/2 H2(g) + 1/2 Br2(g) <=> HBr(g)}$ What is the value of K_c, at the same temperature, for the reaction below? H₂(g) + Br₂(g) ⇌ 2 HBr(g) A. 12² B. 2 × 12 C. $\dfrac{1}{12^2}$ D.…

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Zadanie 23

The following equilibrium is established at a certain temperature. $\ce{1/2 N2(g) + 1/2 O2(g) <=> NO(g)} \qquad K_c = 3.0 \times 10^{-4}$ At equilibrium, [N₂] = 0.40 mol dm⁻³ and [O₂] = 0.10 mol dm⁻³. What is the…

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 24

Which species are Brønsted–Lowry acids in the equilibrium below? HCO₃⁻(aq) + H₂O(l) ⇌ H₃O⁺(aq) + CO₃²⁻(aq) A. HCO₃⁻ and H₂O B. H₂O and CO₃²⁻ C. H₃O⁺ and CO₃²⁻ D. HCO₃⁻ and H₃O⁺

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 25

Which 0.10 mol dm⁻³ aqueous solution has the lowest pH? A. CH₃COOH B. HCl C. H₂SO₄ D. NH₄Cl

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Zadanie 26

Boron trifluoride reacts with ammonia as shown. BF₃ + NH₃ → F₃B−NH₃ Which statement is correct? A. NH₃ is a Lewis acid because it donates a pair of electrons B. BF₃ is a Lewis base because it donates a pair of electrons C. NH₃ is a…

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Zadanie 27

Equimolar aqueous solutions of four salts are prepared. In which set are the salts arranged in order of increasing pH? A. KCl < NH₄Cl < CH₃COOK < Na₂CO₃ B. NH₄Cl < KCl < Na₂CO₃ < CH₃COOK C.…

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Zadanie 28

In which species would nitrogen be oxidized if it were converted to N₂O? A. NO₂ B. NH₄⁺ C. HNO₃ D. N₂O₃

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Zadanie 29

The half-equation below is balanced using the lowest possible whole-number coefficients. a Cr₂O₇²⁻(aq) + b H⁺(aq) + c e⁻ → d Cr³⁺(aq) + f H₂O(l) What is the value of c? A. 3 B. 6 C. 7 D. 14

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Zadanie 30

What are the products when dilute aqueous sodium sulfate is electrolysed using inert electrodes? E^⊖(Na⁺∣Na) = −2.71 V Choose the products at the anode (positive electrode) and at the cathode (negative electrode). A. Anode:…

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamkniętełatwe (szac.)

Zadanie 32

Which functional groups are present in aspirin (acetylsalicylic acid)? A. Hydroxyl, ester and phenyl B. Carboxyl, ester and phenyl C. Carboxyl, amido and phenyl D. Carboxyl, alkoxy and hydroxyl

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Zadanie 33

Which compounds are members of the same homologous series? A. Methanol, methanal, methanoic acid B. Ethane, ethene, ethyne C. Butan-1-ol, butan-2-ol, 2-methylpropan-2-ol D. Methanal, ethanal, propanal

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 34

Which procedure is best for converting butan-1-ol into butanoic acid? A. Heat under reflux with an acidified oxidizing agent B. Heat under reflux with a reducing agent C. Heat with an acidified oxidizing agent and distil off the product as it forms D. Heat…

Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 35

What are the type of reaction and the role of benzene in the following reaction? C₆H₆ + Br⁺ → C₆H₅Br + H⁺ A. Type of reaction: substitution; role of benzene: nucleophile B. Type of reaction: substitution; role of benzene: electrophile C. Type of…

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Zadanie 38

Which compound produces the following ¹H NMR spectrum? A. Butanal B. Butanone C. 2-Methylpropanal D. 2-Methylpropan-1-ol

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Chemia IBPaper 1, maj 2022, TZ1wzorowane1 pktzamknięteśrednie (szac.)

Zadanie 40

Which compound produces this mass spectrum? A. Propanoic acid, CH₃CH₂COOH B. Ethyl methanoate, HCOOCH₂CH₃ C. Butan-1-ol, CH₃CH₂CH₂CH₂OH D. Methyl ethanoate, CH₃COOCH₃

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