Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 30 zadań z tego arkusza, razem 30 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Periodic trends in atomic properties (3), Nuclear symbols and subatomic particles (2), Electron configurations of atoms and ions (2).
Rozwiąż arkuszCały arkusz po kolei. Wynik na końcu.
Dodaj cały arkusz do zestawuA beam containing protons, neutrons and electrons is passed between two charged metal plates. The three paths observed are labelled P, Q and R. Which row correctly identifies the particle following each path? A. P: electron, Q: proton, R: neutron B. P: proton,…
The letters below stand for four species, not for element symbols. Which pair of species has an identical number of outer-shell electrons? , , , A. J and M B. L and Q C.…
Which diagram shows the electron configuration of an oxygen atom in its ground state? A. Diagram A B. Diagram B C. Diagram C D. Diagram D
Which row shows the gas and the conditions under which its behaviour is closest to that of an ideal gas? A. Hydrogen fluoride, HF, at high pressure and low temperature B. Methane, CH4, at high pressure and low temperature C. Hydrogen fluoride,…
Three orbital shapes, labelled I, II and III, are drawn below. Which row correctly identifies the shapes of a 2s orbital and a 2p orbital? A. 2s: II, 2p: I B. 2s: I, 2p: III C. 2s: I, 2p: II D. 2s: III, 2p: II
A fixed amount of an ideal gas is kept at constant temperature while the volume of its container is decreased by 60 %. How does the pressure of the gas change? pV = nRT A. Pressure decreases by 60 % B. Pressure increases by 60 % C. Pressure increases by 150…
Which row shows the correct formula of aluminium sulfide and the electron configuration of each species in it? A. Al3S2; Al species [Ne]; S species [Ar] B. Al2S3; Al species [Ne] 3s2 3p1; S species [Ne] 3s2 3p4 C. Al2S3; Al…
Four allotropes of carbon, labelled W, X, Y and Z, are described in the table. Which row correctly identifies each allotrope? A. Diamond: Y, Graphite: W, Graphene: Z, Fullerene: X B. Diamond: Y, Graphite: Z, Graphene: W, Fullerene: X C. Diamond: Z, Graphite:…
For which of these molecules is the octet rule satisfied by every atom? I. SiCl4 II. NCl3 III. BCl3 A. I and II only B. I and III only C. II and III only D. I, II and III
Which of these compounds has the weakest ionic bond? A. SrO B. BaO C. SrS D. BaS
Which row lists these molecules in order of increasing bond angle? A. NF3, SiH4, HCHO, C2H2 B. SiH4, NF3, HCHO, C2H2 C. NF3, HCHO, SiH4, C2H2 D. C2H2, HCHO,…
A mixture of biphenyl, C12H10, and 4-phenylphenol, C12H10O, was separated by thin-layer chromatography on a polar silica plate, using the non-polar solvent cyclohexane as the mobile phase. What are the position and the retardation factor…
Simple bonding theory expects every atom in a covalent molecule to end up with eight valence electrons. Two stable gas-phase molecules, BF3(g) and BeF2(g), do not fit this picture. Which adaptation of the bonding model was needed to explain…
Phosphorus occurs as the atom and as several ions. In which row are the species arranged from the smallest radius to the largest? A. P3−, P, P3+, P5+ B. P5+, P3+, P, P3− C. P,…
Which statement explains why the atomic radius decreases across period 3 from magnesium, Mg, to sulfur, S? A. The number of occupied main energy levels increases B. The shielding effect of the inner electrons decreases C. The number of protons in the nucleus…
Which pair of elements would react together most vigorously? A. Na(s) and I2(s) B. Cs(s) and I2(s) C. Na(s) and F2(g) D. Cs(s) and F2(g)
Sulfur has different oxidation states in hydrogen sulfide, H2S, and in sulfurous acid, H2SO3. Which pair of values is correct? A. H2S: +2; H2SO3: +4 B. H2S: −2; H2SO3: +6 C. H2S: −2; H2SO3: +4 D.…
A chemical reaction occurs in a mixture that starts at the same temperature as its surroundings. Immediately after the reaction, the mixture is warmer than before. Which row correctly describes the energy changes in the system and in the surroundings as the…
A student stirred 0.030 mol of solid sodium hydrogencarbonate into 40 cm3 of a 1.0 mol dm−3 solution of ethanedioic acid. H2C2O4(aq) + 2 NaHCO3(s) → Na2C2O4(aq) + 2 CO2(g) + 2 H2O(l) The temperature of the solution fell from…
One route to 2-bromopropane is the substitution of propane by bromine in ultraviolet light. C3H8(g) + Br2(g) → C3H7Br(g) + HBr(g) (C3H8 = 44.11 g mol−1, Br2 = 159.80 g mol−1, C3H7Br = 123.00…
30 cm3 of butane was completely burned in 250 cm3 of oxygen according to the following equation. 2 C4H10(g) + 13 O2(g) → 8 CO2(g) + 10 H2O(l) What volume of oxygen remains unreacted, measured at the original conditions? A. 55…
The Maxwell–Boltzmann distribution below was obtained for a sample of gas at temperature T1. The activation energy of a reaction is marked as Ea. Which graph shows the distribution for the same sample at a higher temperature, T2, together…
In a kinetics experiment, excess dilute hydrochloric acid was added to a fixed mass of marble chips (calcium carbonate), and the volume of carbon dioxide gas produced was measured over time. What is the average rate of gas production for the first 20 seconds?…
A sealed, rigid container holds the following gas-phase reaction at equilibrium. N2(g) + O2(g) ⇌ 2 NO(g) ΔH⊖ = +180 kJ mol−1 Which pair of changes would move the equilibrium position furthest towards the products? A.…
Which two species can act both as Brønsted–Lowry acids and as Brønsted–Lowry bases? A. H2CO3 and CO32− B. HCO3− and SO32− C. HCO3− and HSO3− D. H2SO3 and HSO3−
The pH of a solution is measured as 4.0. Which value, in mol dm−3, is the hydrogen-ion concentration, [H+], of this solution? A. 4.0 × 10−4 B. 1.0 × 10−4 C. 1.0 × 104 D. 4.0 × 104
Part of the reactivity series of metals is shown, from the most reactive to the least reactive. Mg, Al, Mn, Zn, Fe, Ni, Sn, Pb, Cu, Ag Which reaction is spontaneous? A. Fe2+(aq) + Ni(s) → Ni2+(aq) + Fe(s) B.…
Which alcohol and which conditions would give the highest yield of 3-methylbutanoic acid on oxidation with acidified potassium dichromate(VI)? A. 3-methylbutan-2-ol, reflux B. 3-methylbutan-1-ol, distillation C. 3-methylbutan-1-ol, reflux D.…
Which diagram correctly shows the heterolytic fission of the carbon-bromine bond in bromomethane? A. Diagram A B. Diagram B C. Diagram C D. Diagram D
A direct formic acid fuel cell generates electricity by oxidizing formic acid, HCOOH, with oxygen at the two electrodes, shown below as separate half-equations. Anode: HCOOH(aq) → CO2(g) + 2 H+(aq) + 2 e− Cathode:…
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