Zadanie 1
Which compound has the highest percentage of carbon by mass? A. CH3CH2OH B. CH3CHO C. C3H8 D. C2H6
Chemistry SL Paper 1, May 2024, TZ2
Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
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8.00 mol of ammonia are mixed with 8.00 mol of oxygen. The equation for the reaction that occurs is shown below. 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g) What is the amount, in mol, of nitrogen(II) oxide, NO, produced, assuming that the reaction goes to…
Zadanie 3
Ethane-1,2-diol has the molecular formula C2H6O2. Which statement about its empirical formula is correct? A. It is CH3O, because it shows the simplest whole-number ratio of the atoms of each element B. It is C2H6O2, because it shows the…
Zadanie 4
What is the number of hydrogen atoms in 0.400 mol of propane, C3H8? Avogadro's constant (L or NA) = 6.02 × 1023 mol−1 A. 2.41 × 1023 B. 7.22 × 1023 C. 1.44 × 1024 D.…
Zadanie 5
What is the maximum number of electrons that can occupy the fifth energy level (n = 5) in an atom? A. 25 B. 32 C. 50 D. 72
Zadanie 6
An electron in a hydrogen atom falls from the energy level n = 4 to the energy level n = 2. Which statement is correct? A. A photon is emitted and its energy equals the difference between the two energy levels B. A photon is absorbed and its energy equals…
Zadanie 7
Which set of ions shows increasing ionic radii? A. Mg2+ < Na+ < O2− < F− B. Mg2+ < Na+ < F− < O2− C. O2− < F− < Na+ < Mg2+ D. Na+ < Mg2+ < F− < O2−
Zadanie 8
When the same amount of each oxide is added to an equal volume of water, which oxide produces the solution with the lowest pH? A. Li2O B. Al2O3 C. SO3 D. CO2
Zadanie 9
What is the arrangement of the oxygen atoms around each silicon atom in the giant covalent structure of silicon dioxide? A. Linear B. Tetrahedral C. Trigonal planar D. Octahedral
Zadanie 10
What is the number of bonding pairs of electrons in propanedioic acid, HOOC−CH2−COOH? A. 8 B. 10 C. 12 D. 20
Zadanie 11
Which statement best explains why a block of copper can be hammered into a thin sheet without breaking? A. Cations in neighbouring layers repel one another, so they stay fixed in their positions B. Layers of cations can slide over one another because the…
Zadanie 12
Which pair of liquids is immiscible? A. CH3OH and CH3CH2CH2OH B. CH3COCH3 and H2O C. C6H14 and CCl4 D. C6H12 and H2O
Zadanie 13
A student determined the enthalpy change of combustion of ethanol by burning it in a spirit burner under a copper can containing 150 cm3 of water. The value obtained was less exothermic than the literature value. Which modification would improve the…
Zadanie 14
Standard enthalpy changes of reaction are provided for the following reactions. C(s) + O2(g) → CO2(g) ΔH⊖ = −394 kJ…
Zadanie 15
Which statement about the energy changes in a reaction between covalent molecules is correct? A. The enthalpy change of the reaction equals the sum of the bond enthalpies of the bonds broken minus the sum of the bond enthalpies of the bonds formed B. The…
Zadanie 16
Two gases react very slowly even at 900 K and a high pressure. Which best explains the low rate of reaction? A. The frequency of collisions between the molecules is low B. A high fraction of the collisions has the correct orientation C. The reaction is…
Zadanie 17
Excess zinc granules react with 40.0 cm3 of hydrochloric acid of concentration 1.00 mol dm−3 at 25 °C. The volume of hydrogen collected was measured over time and curve I was obtained. The experiment is repeated at the same…
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Zadanie 18
Which pair of changes will both shift the position of equilibrium to the left? CH4(g) + H2O(g) ⇌ CO(g) + 3 H2(g) ΔH = +206 kJ mol−1 A. Decrease the temperature and increase the pressure B. Increase the temperature and increase…
Zadanie 19
At a certain temperature the equilibrium constant for the reaction below is Kc = 50. H2(g) + I2(g) ⇌ 2 HI(g) What is the value of Kc for the reaction below at the same temperature? 2 HI(g) ⇌ H2(g) + I2(g) A. 0.020 B. 0.14 C. 25 D. 50
Zadanie 20
What is the conjugate base of H2PO4−? A. H3PO4 B. HPO42− C. PO43− D. H3O+
Zadanie 21
What is the pH of a 5.0 × 10−3 mol dm−3 aqueous solution of nitric acid, HNO3? A. 0.0050 B. 2.30 C. 3.00 D. 11.70
Zadanie 22
Which statement is correct for the following spontaneous reaction? 2 I−(aq) + H2O2(aq) + 2 H+(aq) → I2(aq) + 2 H2O(l) A. I− is the oxidizing agent and H2O2 is oxidized B. I− is the oxidizing agent and H2O2 is reduced C.…
Zadanie 23
Zinc lies above nickel in the reactivity series. A voltaic cell is made from a zinc electrode in Zn2+(aq) and a nickel electrode in Ni2+(aq). The electrodes are connected by a wire with a voltmeter, and the two solutions are connected by a salt…
Zadanie 25
What is the major product formed when bromine, Br2, reacts with but-1-ene in an inert solvent? A. 2,2-dibromobutane B. 2-bromobutane C. 1,2-dibromobutane D. 1-bromobutane
Zadanie 26
Which of the statements are correct for propan-1-ol and butan-1-ol, which belong to the same homologous series? I. They differ by one CH2 unit. II. They have the same empirical formula. III. They have the same general formula, CnH2n+1OH. A. I…
Zadanie 27
Which of the following pairs are structural isomers? I. CH3CH2CH2OH and CH3CH(OH)CH3 II. CH3CH2CHO and CH3COCH3 III. CH3CH2CH2CH3 and CH3CH=CHCH3 A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 29
Which graph shows the correct relationship between the pressure and the temperature in °C of a fixed amount of an ideal gas at constant volume? A. Graph A B. Graph B C. Graph C D. Graph D
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Zadanie 30
In a titration, the initial burette reading was 3.20 ± 0.05 cm3 and the final burette reading was 28.70 ± 0.05 cm3. What is the uncertainty associated with the volume of titrant added? A. ±0.00 cm3 B.…