Zadanie 1
Which of the following are homogeneous mixtures? I. Dry air II. A mixture of hexane and cyclohexane III. A mixture of oil and water A. I and II only B. I and III only C. II and III only D. I, II and III
Chemistry HL Paper 1, May 2024, TZ2
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Dodaj cały arkusz do zestawuZadanie 2
Which compound has the highest percentage of carbon by mass? A. CH3CH2OH B. CH3CHO C. C3H8 D. C2H6
Zadanie 3
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 4
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 5
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 6
Which graph shows the correct trend in the first ionization energies of the elements with atomic number Z = 11 to Z = 18? A. Graph A B. Graph B C. Graph C D. Graph D
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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
In which diagram are the 4s and 3d orbitals of the Ni2+ ion correctly filled with electrons? A. Diagram A B. Diagram B C. Diagram C D. Diagram D
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Zadanie 10
In which species is the oxidation state of cobalt different? A. [CoCl4]2− B. [Co(H2O)6]2+ C. [Co(NH3)6]2+ D. [Co(NH3)4Cl2]+
Zadanie 11
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 12
What is the number of bonding pairs of electrons in propanedioic acid, HOOC−CH2−COOH? A. 8 B. 10 C. 12 D. 20
Zadanie 13
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 14
What are the numbers of sigma and pi bonds in a molecule of propenenitrile, CH2=CH−C≡N? A. 6 sigma bonds and 3 pi bonds B. 7 sigma bonds and 3 pi bonds C. 6 sigma bonds and 2 pi bonds D. 9 sigma bonds and no pi bonds
Zadanie 15
Which molecule is non-polar? A. SF4 B. ClF3 C. BrF5 D. XeF4
Zadanie 16
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 17
Standard enthalpy changes of reaction are provided for the following reactions. C(s) + O2(g) → CO2(g) ΔH⊖ = −394 kJ…
Zadanie 18
Which compound has the largest lattice enthalpy? A. KI B. NaBr C. MgO D. CaS
Zadanie 20
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 21
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…
- Materiał graficzny
Zadanie 22
The graph shows plots of ln k against for two reactions, X and Y. Both lines are extended to the vertical axis. Considering the Arrhenius equation , which combination is correct for reactions X and Y?…
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Zadanie 23
A reaction proceeds by the following mechanism. Step 1: NO2 + NO2 → NO3 + NO (slow) Step 2: NO3 + CO → NO2 + CO2 (fast) Which statement is correct about the reaction? A. The overall equation for the reaction is 2 NO2 → NO3 + NO B.…
Zadanie 24
Which graph of rate of reaction against concentration of the reactant is correct for a reaction that is second order with respect to that reactant? A. Graph A B. Graph B C. Graph C D. Graph D
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Zadanie 25
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 26
1.50 mol of NO and 0.80 mol of O2 are mixed in a 2.0 dm3 container and allowed to reach equilibrium at a certain temperature. 2 NO(g) + O2(g) ⇌ 2 NO2(g) There was 1.20 mol of NO2 present in the container at equilibrium. What…
Zadanie 27
What is the ratio of [H+] in an aqueous solution of ammonia with pH = 10 to [H+] in pure water at 298 K? A. 10 : 7 B. 7 : 10 C. 1 : 103 D. 103 : 1
Zadanie 28
What is the conjugate base of H2PO4−? A. H3PO4 B. HPO42− C. PO43− D. H3O+
Zadanie 29
Which combination is correct for a strong acid and its conjugate base? A. The pKa of the acid is low and the Kb of the conjugate base is low B. The pKa of the acid is low and the Kb of the…
Zadanie 30
The pH curve below is produced when 25.0 cm3 of ethanoic acid of concentration 0.100 mol dm−3 is titrated with sodium hydroxide solution of concentration 0.100 mol dm−3. Besides water and sodium ions, which species…
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Zadanie 31
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 32
The concentration of hypochlorite ions in bleach can be determined in two stages. Stage I: ClO−(aq) + 2 I−(aq) + 2 H+(aq) → Cl−(aq) + I2(aq) + H2O(l) Stage II: I2(aq) + 2 S2O32−(aq) → 2 I−(aq) + S4O62−(aq) Which of the following is correct? A.…
Zadanie 34
Which combination is correct for a reaction with an equilibrium constant K much smaller than 1 at 298 K under standard conditions? A. Ecell⊖ is negative and ΔG⊖ is positive B. Ecell⊖ is positive and…
Zadanie 36
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 39
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 40
What are the number of signals and the splitting of these signals in the 1H NMR spectrum of ethoxyethane, CH3CH2OCH2CH3? A. 1 signal, a singlet B. 2 signals, a triplet and a quartet C. 2 signals, two triplets D. 2 signals, a doublet and a quartet