Zadanie 1
Which term describes the change of state shown in the equation below? I2(s) → I2(g) A. Deposition B. Melting C. Evaporation D. Sublimation
Chemistry SL Paper 1A, November 2025, TZ3
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Dodaj cały arkusz do zestawuZadanie 2
Which feature of the hydrogen emission spectrum shows that the spacing between the electron energy levels decreases as the energy of the levels increases? A. The lines within each series get closer together towards the high-frequency end B. The spectrum…
Zadanie 3
What is the total number of ions in 0.30 mol of iron(III) nitrate, Fe(NO3)3? A. 0.30 × 1 × 6.02 × 1023 B. 0.30 × 3 × 6.02 × 1023 C. 0.30 × 4 × 6.02 × 1023 D.…
Zadanie 4
0.30 dm3 of nitrogen is mixed with 0.60 dm3 of hydrogen and the mixture reacts as completely as possible. All gas volumes are measured at the same temperature and pressure. N2(g) + 3 H2(g) → 2 NH3(g) What volume of ammonia, in…
Zadanie 5
An ideal gas is held in a rigid, sealed container at 27 °C, where its pressure is P Pa. The container is then cooled to −3 °C. Which expression best describes the new pressure of the gas? A. Slightly less than P B. Slightly more than P C. One ninth of…
Zadanie 6
Which row correctly gives the electron domain geometry and the molecular geometry of oxygen difluoride, OF2? A. Tetrahedral electron domain geometry; bent molecular geometry B. Trigonal planar electron domain geometry; bent molecular geometry C.…
Zadanie 7
Which molecule has the largest net dipole moment? A. SiF4 B. CS2 C. H2S D. H2O
Zadanie 8
Which statements about the allotropes of carbon are correct? I. Graphite conducts electricity because each carbon atom contributes one electron to a delocalized system. II. Diamond conducts electricity because it has a covalent network structure. III.…
Zadanie 9
Which of these metals has the strongest metallic bonding? A. Be B. Li C. Na D. Mg
Zadanie 10
A solid has a very high melting point, does not conduct electricity when solid or when molten, and is insoluble in water and in non-polar solvents. Which type of structure does the solid have? A. Ionic lattice B. Metallic lattice C. Covalent molecular D.…
Zadanie 11
Which of these elements is a non-metal found in the p-block of the periodic table? A. Bi B. Se C. Sc D. Cs
Zadanie 12
In which compound is the electrostatic attraction between the ions weakest? A. MgO B. CaO C. CaS D. MgS
Zadanie 13
Which oxide reacts with water to give a solution with a pH greater than 7? A. SO2 B. P4O10 C. Al2O3 D. Na2O
Zadanie 14
Which of these alkanes boils at the lowest temperature? A. CH3CH2CH2CH2CH3 B. C(CH3)4 C. (CH3)2CHCH2CH3 D. CH3CH2CH2CH2CH2CH3
Zadanie 15
When the equation for the complete combustion of 1 mol of pentan-1-ol, C5H11OH, is balanced, what is the sum of all the coefficients? Unbalanced equation: C5H11OH(l) + O2(g) → CO2(g) + H2O(l) A. 19 B. 19.5 C. 20 D. 39
Zadanie 16
The standard enthalpy changes of two reactions are given below. N2(g) + O2(g) → 2 NO(g) ΔH⊖ = x kJ mol−1 2 NO(g) + O2(g) → 2 NO2(g) ΔH⊖ = y kJ mol−1 What is ΔH⊖, in…
Zadanie 17
Which statement describes a disadvantage of using bioethanol rather than petrol (gasoline) as a fuel for cars? A. The carbon dioxide released when bioethanol burns was recently removed from the atmosphere by the crop B. Bioethanol releases less energy per…
Zadanie 18
Sucrose, C12H22O11, is hydrolysed with excess water and the glucose formed is then fermented. C12H22O11(aq) + H2O(l) → 2 C6H12O6(aq) C6H12O6(aq) → 2 C2H5OH(aq) + 2 CO2(g) Mr of C12H22O11 = 342.34 Mr of…
Zadanie 19
Equal volumes of nitrogen and hydrogen are mixed and react according to the equation below. The volumes of the two reactants are measured at intervals. N2(g) + 3 H2(g) → 2 NH3(g) Which graph shows how the volumes of the two reactants change with time? A.…
- Materiał graficzny
Zadanie 20
Which changes would increase the rate of the reaction between nitrogen and hydrogen? N2(g) + 3 H2(g) → 2 NH3(g) I. Lowering the temperature of the gas mixture II. Compressing the gas mixture into a smaller volume at constant temperature III. Adding an…
Zadanie 21
Which of the following correctly describes the effect of a catalyst on a reaction? A. It increases the frequency of collisions between reactant particles B. It increases the proportion of collisions with energy greater than or equal to the activation energy C.…
Zadanie 22
A sealed glass tube contains solid iodine in equilibrium with iodine vapour at constant temperature. Which of the following could be observed? A. The purple colour of the vapour gradually becomes more intense B. The total mass of the solid decreases steadily…
Zadanie 23
A mixture of 1 mol of nitrogen and 1 mol of oxygen is left to reach equilibrium at 25 °C. N2(g) + O2(g) ⇌ 2 NO(g) K = 4.5 × 10−31 at 25 °C Which relationship holds in the equilibrium mixture? A. [NO] ≪ [N2] B.…
Zadanie 24
An aqueous solution at 298 K has a pH of 9.20. Kw = [H+][OH−] = 1.00 × 10−14 at 298 K What is the hydroxide ion concentration of the solution, in mol dm−3? A. 6.31 × 10−10 B. 1.58 × 10−9 C.…
Zadanie 25
Which of these aqueous solutions has the highest pH? A. 0.10 mol dm−3 HCl B. 1.0 mol dm−3 NH3 C. 0.10 mol dm−3 KOH D. 1.0 mol dm−3 KOH
Zadanie 26
Which row identifies the oxidizing agent and the reducing agent in the reaction below? 3 Cu(s) + 2 NO3−(aq) + 8 H+(aq) → 3 Cu2+(aq) + 2 NO(g) + 4 H2O(l) A. Oxidizing agent: Cu, reducing agent: NO3− B. Oxidizing agent: NO3−, reducing…
Zadanie 27
Which statement correctly describes a type of electrochemical cell? A. A secondary cell operates as a voltaic cell when discharging and as an electrolytic cell when it is recharged B. A primary (voltaic) cell converts electrical energy into chemical energy C.…
Zadanie 28
Which compound is formed when pentan-2-one, CH3COCH2CH2CH3, is reduced? A. CH3CH2CH2CH2CH2OH B. CH3CH2CH2CH2COOH C. CH3CH2CH2CH2CHO D. CH3CH(OH)CH2CH2CH3
Zadanie 29
Which species is formed when a chlorine molecule undergoes homolytic fission in the presence of ultraviolet radiation? A. A chlorine radical, Cl ⋅ B. A chloride ion, Cl− C. A chlorine cation, Cl+ D. An excited chlorine molecule, Cl2 ⋅
Zadanie 30
Which species is the electrophile in the reaction below? CH3CH2Cl + CN− → CH3CH2CN + Cl− A. CN− B. Cl− C. CH3CH2Cl D. CH3CH2CN