Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
W bazie 40 zadań z tego arkusza, razem 40 punktów, każde z kluczem i schematem punktowania. Najwięcej zadań sprawdza: Assigning oxidation states (2), Magnitude and temperature dependence of K (2), Strong and weak acids and bases (2).
Rozwiąż arkuszCały arkusz po kolei. Wynik na końcu.
Dodaj cały arkusz do zestawuA beaker contains a clear, colourless solution of potassium nitrate in water. What is the type of mixture and the best method of obtaining the solid salt from it? A. heterogeneous, by filtration B. heterogeneous, by evaporation C. homogeneous, by filtration D.…
Which property is the same for ammonia molecules containing deuterium, ND3, and ordinary ammonia molecules, NH3? A. Molar mass B. Molecular geometry C. Density of the gas at STP D. Rate of diffusion
What is the maximum number of electrons that can occupy the n = 4 main energy level? A. 8 B. 16 C. 18 D. 32
The successive ionization energies of an element are plotted against the number of the ionization. What is the group number of the element? A. 2 B. 3 C. 13 D. 14
What is the empirical formula of a compound with the following composition by mass? A. C6HO4 B. C4H8O C. C2H4O D. C4H8O2
What is the charge of the monatomic ion usually formed by the element with the following electron configuration? [Ne] 3s2 3p4 A. 2+ B. 2− C. 4+ D. 6+
Which molecule is polar? A. BF3 B. NF3 C. CCl4 D. C2H4
A paper chromatogram is shown. The distances marked were measured along the paper. What is the retardation factor, RF, of compound Y? A. 0.40 B. 0.60 C. 0.70 D. 1.67
What are the electron domain and molecular geometries of ClF3? In each option the electron domain geometry is given first and the molecular geometry second. A. trigonal bipyramidal, trigonal planar B. trigonal bipyramidal, T-shaped C. trigonal planar,…
Methanoic acid, HCOOH, has the structure shown. What are the hybridizations of the carbon atom, the oxygen atom of the C=O bond and the oxygen atom of the O–H bond? In each option the hybridizations are listed in that order. A. sp2,…
Which monomer produces this addition polymer? A. CH2=CHCH2CH3 B. CH3CH=CHCH3 C. CH2=C(CH3)2 D. CH2=CHCH=CH2
Why is the first ionization energy of sulfur greater than that of magnesium? A. The outer electrons of sulfur are further from the nucleus. B. Sulfur atoms have more occupied main energy levels. C. Sulfur atoms have a greater nuclear charge, while the…
The diagram shows an outline of the periodic table in which four elements of period 3 are labelled A, B, C and D. Which element forms an amphoteric oxide? A. Element A B. Element B C. Element C D. Element D
What is the oxidation state of chlorine in Cl2O7? A. −7 B. +3.5 C. +7 D. +14
Which properties are typical of transition elements? I. Catalytic activity II. Formation of complex ions with ligands III. A single oxidation state in all their compounds A. I and II only B. I and III only C. II and III only D. I, II and III
What is the electron configuration of the Co2+ ion? A. [Ar] 3d7 B. [Ar] 4s2 3d5 C. [Ar] 4s1 3d6 D. [Ar] 4s2 3d7
Which compound shows cis-trans isomerism? A. Compound A B. Compound B C. CH2=C(CH3)2 D. CH3CH=CH2
The energy profile below was recorded for a reaction. Which pair of statements is consistent with it? In each option the first statement compares the enthalpy of the products with that of the reactants and the second gives the sign of ΔH. A. products…
A liquid fuel was burned in a spirit burner and the heat released was used to warm water in a metal calorimeter, as shown. Q = mcΔT What is the standard enthalpy change of combustion, ΔHcombustion⊖, of the fuel according to the…
What is the coefficient of oxygen when the equation for the complete combustion of butan-1-ol is balanced using the smallest whole numbers? The unbalanced equation is C4H9OH + O2 → CO2 + H2O. A. 4 B. 6 C. 7 D. 13
Which change results in a decrease in entropy? A. 2 NaHCO3(s) → Na2CO3(s) + H2O(g) + CO2(g) B. I2(s) → I2(g) C. CO(g) + 2 H2(g) → CH3OH(l) D. KNO3(s) → KNO3(aq)
Which condition applies to a reaction mixture that has reached equilibrium at constant temperature and pressure? A. ΔH = 0 B. ΔG = 0 C. K = 1 D. ΔSsystem = 0
What are the limiting reactant and the theoretical yield of hydrogen when 0.30 mol of aluminium reacts with 0.60 mol of hydrochloric acid? 2 Al(s) + 6 HCl(aq) → 2 AlCl3(aq) + 3 H2(g) In each option the limiting reactant is given first and the theoretical…
Which are units for rate of reaction? A. s mol−1 dm3 B. mol dm−3 min C. mol dm−3 min−1 D. mol min−1
Which changes increase the rate of the reaction? CaCO3(s) + 2 HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g) I. Grinding the calcium carbonate into a fine powder II. Using a larger volume of hydrochloric acid of the same concentration III. Warming the…
Which species is an intermediate in the following reaction mechanism? NO2(g) + NO2(g) → NO3(g) + NO(g) NO3(g) + CO(g) → NO2(g) + CO2(g) A. NO2 B. NO3 C. NO D. CO2
The rate of the reaction between propanone and iodine in acidic solution was measured at a fixed concentration of the acid catalyst. CH3COCH3(aq) + I2(aq) → CH3COCH2I(aq) + HI(aq) What is the overall reaction order? A. Zero order B. First order C.…
Which statement about the rate constant, k, of an elementary reaction is correct? A. k increases when the temperature is raised, whether the reaction is exothermic or endothermic. B. k decreases when the temperature is raised for exothermic reactions. C. k…
The following system is at equilibrium. H2(g) + I2(g) ⇌ 2 HI(g) K = 54 What is the value of the equilibrium constant, K, for the reaction 2 HI(g) ⇌ H2(g) + I2(g)? A. −54 B. C. D.
The container holding the equilibrium mixture below is compressed to half its volume while the temperature is kept constant. Which row gives the change in the amount of PCl5 and the effect on the equilibrium constant, K?…
What is the conjugate acid of the hydrogen phosphate ion, HPO42−? A. PO43− B. H2PO4− C. H3PO4 D. HPO32−
Which solution has a pH of 11.0 at 298 K? A. 10−3 mol dm−3 KOH(aq) B. 10−11 mol dm−3 KOH(aq) C. 10−3 mol dm−3 NH3(aq) D. 10−3 mol dm−3 HCl(aq)
What is the main reason why nitric acid has a lower pH than ethanoic acid of the same concentration? A. Nitric acid is an oxidizing agent. B. Nitric acid ionizes to a greater extent in water. C. The conjugate base of nitric acid is stronger than that of…
Which salt forms a basic solution when dissolved in water? A. KNO3 B. NH4Br C. CH3COOK D. NaHSO4
What is the best indicator to use in the titration of propanoic acid with potassium hydroxide? A. Methyl orange, pKa = 3.7 B. Bromocresol green, pKa = 4.7 C. Bromothymol blue, pKa = 7.0 D.…
In which compound does nitrogen have an oxidation state of +3? A. NH3 B. HNO2 C. NO2 D. HNO3
What is the standard cell potential, Ecell⊖, of the following cell? Pb2+(aq) + 2 e− ⇌ Pb(s) E⊖ = −0.13 V Zn2+(aq) + 2 e− ⇌ Zn(s) E⊖ = −0.76 V A. −0.89 V B. −0.63 V…
Which change represents oxidation of the functional group? A. CH3COCH3 → CH3CH(OH)CH3 B. CH3CH(OH)CH3 → CH3COCH3 C. CH3CH2COOH → CH3CH2CHO D. CH3CH=CH2 → CH3CH2CH3
What are the products of the electrolysis of concentrated aqueous sodium chloride using inert electrodes? In each option the product at the anode is given first and the product at the cathode second. A. chlorine gas, hydrogen gas B. chlorine gas, sodium metal…
Which equation represents a propagation step in the radical substitution of ethane by bromine? A. Br2 → 2 Br ⋅ B. ⋅ C2H5 + Br ⋅ → C2H5Br C. C2H6 + Br ⋅ → C2H5Br + H ⋅ D. ⋅ C2H5 + Br2 → C2H5Br + Br ⋅
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