Zadanie 1
A sample of ammonium sulfate, (NH4)2SO4, has a mass of 66.1 g. Mr = 132.17 How many moles of ammonium ions are present in the sample? A. 0.25 B. 0.50 C. 1.00 D. 1.50
Chemistry HL Paper 1, November 2024
Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
Dodaj cały arkusz do zestawuZadanie 2
Antimony(III) sulfide burns in air to form antimony(III) oxide and sulfur dioxide. Sb2S3(s) + O2(g) → Sb2O3(s) + SO2(g) The equation is balanced using the smallest whole-number coefficients. What is the sum of all the coefficients? A. 8 B. 15 C. 19 D.…
Zadanie 3
Aluminium reacts with chlorine gas. 2 Al(s) + 3 Cl2(g) → 2 AlCl3(s) What mass of aluminium chloride, in g, forms when 2.70 g of aluminium reacts with 2.27 dm3 of chlorine at STP? Molar volume = 22.7 dm3 mol−1 A. 4.44 B. 8.89 C.…
Zadanie 4
A steel cylinder of volume 5.0 dm3 holds 2.0 g of helium at 27 °C. Ar(He) = 4.0; R = 8.31 J K−1 mol−1; PV = nRT Which expression gives the pressure of the helium, in Pa? A.…
Zadanie 5
The mass spectrum of a sample of element X is shown. What is the relative atomic mass of X? A. 69.0 B. 69.8 C. 70.0 D. 70.2
- Materiał graficzny
Zadanie 6
Which statement correctly compares infrared and ultraviolet radiation? A. Infrared radiation has a longer wavelength and a lower photon energy than ultraviolet radiation. B. Infrared radiation has a longer wavelength and a higher frequency than ultraviolet…
Zadanie 7
The graph shows the first ten successive ionization energies of an element. Which element is it? A. N B. Si C. P D. Cl
- Materiał graficzny
Zadanie 8
[Ni(H2O)6]2+ is green, whereas [Ni(NH3)6]2+ is blue. Which statement best accounts for the different colours of the two complex ions? A. The two sets of ligands give different energy gaps between the split 3d orbitals, so light of different…
Zadanie 9
Which period 3 oxide forms a solution with pH > 7 when it is added to water? A. Al2O3 B. Na2O C. SiO2 D. SO2
Zadanie 10
Which electron configuration is that of a transition element atom in its ground state? A. [Ar] 3d10 4s2 4p1 B. [Ar] 3d10 4s2 C. [Ar] 3d6 D. [Ar] 3d8 4s2
Zadanie 11
Which row correctly states the types of intermolecular force present between molecules of ethane, methylamine and fluoromethane? A. Ethane: London (dispersion) forces only; methylamine: London forces, dipole-dipole forces and hydrogen bonding; fluoromethane:…
Zadanie 12
The structure of a compound is shown below. Atom (1) is the nitrogen atom of the ring, atom (2) is the ring carbon bonded to the ethynyl group and atom (3) is the terminal carbon of the ethynyl group. Which row gives the hybridization and the molecular…
- Materiał graficzny
Zadanie 13
How many sigma (σ) bonds and how many pi (π) bonds does one molecule of the compound below contain? HC≡C−CH=CH−C≡N A. 5 σ and 8 π B. 8 σ and 5 π C. 9 σ and 5 π D. 13 σ and 5 π
Zadanie 14
Which statements about alloys are correct? I. Alloys can contain non-metallic elements as well as metals. II. Alloys are usually softer than the pure metals they contain, because their layers slide over each other more easily. III. Atoms of different sizes…
Zadanie 15
The decomposition of calcium carbonate is not spontaneous at low temperatures but is spontaneous at high temperatures. CaCO3(s) → CaO(s) + CO2(g) What are the signs of ΔH⊖ and ΔS⊖ for this reaction?…
Zadanie 16
Consider the following equations. H2(g) + Cl2(g) → 2 HCl(g) ΔH⊖ = −x kJ C(s) + 2 Cl2(g) → CCl4(g) ΔH⊖ = −y kJ 2 C(s) + H2(g) → C2H2(g) ΔH⊖ = +z kJ What…
Zadanie 17
Two samples of the same gas, at temperatures T1 and T2 where T2 > T1, have the Maxwell–Boltzmann distributions of kinetic energy shown. Which diagram is correct? A. Diagram A B. Diagram B C. Diagram C D. Diagram D
- Materiał graficzny
Zadanie 18
50.0 cm3 of copper(II) sulfate solution of concentration 0.200 mol dm−3 is placed in an insulated cup. Excess zinc powder is added and the mixture is stirred. The maximum temperature increase is 10.4 °C.…
Zadanie 19
Potassium chlorate(V) was heated and the volume of oxygen collected was measured against time. The dotted line shows the result without a catalyst. The experiment is repeated at the same temperature with the same mass of potassium chlorate(V) and with…
- Materiał graficzny
Zadanie 20
The rate constant, k, of a reaction was measured at several temperatures. A graph of ln k against 1/T (with T in kelvin) is a straight line with a gradient of −5.2 × 103 K.…
Zadanie 21
The reaction between hydrogen and iodine monochloride has the overall equation H2(g) + 2 ICl(g) → I2(g) + 2 HCl(g) It proceeds by a two-step mechanism. H2 + ICl → HI + HCl (slow step) HI + ICl → I2 + HCl (fast step) What is the rate…
Zadanie 22
Ammonia dissolves in water as shown in the equation below. What will happen if the temperature of the solution is increased? NH3(g) + H2O(l) ⇌ NH4+(aq) + OH−(aq) ΔH⊖ = −31 kJ mol−1 A. The equilibrium shifts to the left…
Zadanie 23
Which statements about the position of equilibrium are correct? ΔG⊖ = −RTln K I. If ΔG⊖ > 0, then K < 1 and the reactants are favoured. II. At equilibrium, ΔG⊖ is equal to zero. III. If ΔG⊖ = 0,…
Zadanie 24
The pH of solution P is 3 and the pH of solution Q is 9. What is the ratio of their H3O+ concentrations? A. [H3O+] is 3 times higher in P than in Q. B. [H3O+] is 6 times higher in P than in Q. C. [H3O+] is 1 × 103 times…
Zadanie 25
Using the data in the table, which conjugate base is the weakest? A. CN− B. CH3COO− C. NO2− D. CHCl2COO−
- Tabela do uzupełnienia
Zadanie 26
Consider the buffer system made from ethanoic acid and sodium ethanoate, CH3COOH / CH3COONa. What happens when a small amount of strong acid is added to the buffer? A. [CH3COOH] increases. B. [CH3COO−] increases. C. The H+…
Zadanie 27
A 20.0 cm3 sample of a weak monoprotic acid, HA, was titrated with sodium hydroxide solution of concentration 0.100 mol dm−3. What is the pKb of the conjugate base of HA, A−? A. 3 B. 5 C. 9 D. 11
- Materiał graficzny
Zadanie 28
In which reaction does N2 act as a reducing agent? A. N2(g) + 3 H2(g) → 2 NH3(g) B. 3 Mg(s) + N2(g) → Mg3N2(s) C. N2(g) + O2(g) → 2 NO(g) D. 6 Li(s) + N2(g) → 2 Li3N(s)
Zadanie 29
A voltaic cell is constructed from a half-cell of metal M in a solution of M2+ ions and a half-cell of metal N in a solution of N2+ ions. The half-cells are joined by a salt bridge and an external wire.…
Zadanie 30
For a reaction in a voltaic cell, both ΔH⊖ and ΔS⊖ are negative. Which statement is correct? ΔG⊖ = ΔH⊖ − TΔS⊖ and ΔG⊖ = −nFEcell⊖ A.…
Zadanie 31
A half-cell of metal X in a 1.00 mol dm−3 solution of X2+ ions is connected to a standard hydrogen electrode (SHE). The voltmeter reads 0.34 V and the X electrode is the positive terminal. Which statement is correct? A. The standard…
Zadanie 32
Which functional groups are present in the compound shown? A. Carboxyl, hydroxyl and primary amino B. Ester, ether and primary amino C. Ester, hydroxyl and secondary amino D. Ester, hydroxyl and primary amino
- Materiał graficzny
Zadanie 33
What is the IUPAC name of the compound shown? A. 4-chloro-5-methylhexan-2-one B. 3-chloro-2-methylhexan-5-one C. 5-methyl-4-chlorohexan-2-one D. 4-chloro-5-methylhexan-2-ol
- Materiał graficzny
Zadanie 34
Which compound can be oxidized to a carboxylic acid by heating under reflux with an excess of an acidified oxidizing agent? A. CH3CH(OH)CH2CH3 B. (CH3)3COH C. (CH3)2CHCH2OH D. CH3COCH2CH3
Zadanie 35
How many optical isomers exist for menthol, the compound shown? A. 3 B. 6 C. 8 D. 9
- Materiał graficzny
Zadanie 36
1-Bromobutane reacts with warm aqueous sodium hydroxide to form butan-1-ol. CH3CH2CH2CH2Br + OH− → CH3CH2CH2CH2OH + Br− Which row gives the mechanism and the rate expression of this reaction? A. SN1; rate = k[C4H9Br] B.…
Zadanie 37
Which compound gives an optically active product when it is reduced? A. Pentanal B. Pentan-3-one C. 3-Methylbutanal D. Pentan-2-one
Zadanie 38
Which statements about the molecular ion, M+, in a mass spectrum are correct? I. The M+ peak is always the peak of greatest intensity in the spectrum. II. The M+ ion forms when a molecule loses one electron. III. The m/z…
Zadanie 39
Which compound gives this 1H NMR spectrum? A. Diethyl ether, CH3CH2OCH2CH3 B. Methyl propanoate, CH3CH2COOCH3 C. Butanone, CH3COCH2CH3 D. Ethyl ethanoate, CH3COOCH2CH3
- Materiał graficzny
Zadanie 40
A student determines the concentration of a solution of hydrochloric acid by titration. The same titration is repeated five times, and the titres are scattered both above and below the mean, because the student finds it difficult to judge the exact point at…