Zadanie 1
What is correct about the species ? A. 65 protons, 65 neutrons, 63 electrons B. 30 protons, 35 neutrons, 28 electrons C. 30 protons, 65 neutrons, 28 electrons D. 65 protons, 35 neutrons, 63 electrons
Chemistry SL Paper 1A, May 2026, TZ1
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Dodaj cały arkusz do zestawuZadanie 2
What is the maximum number of electrons that can occupy the 3rd main energy level in an atom? A. 6 B. 9 C. 18 D. 32
Zadanie 3
What is the correct electron configuration of the selenium atom? A. 1s22s22p63s23p63d104s24p4 B. 1s22s22p62d103s23p64s24p4 C. 1s22s22p63s23p63d104s24p6 D. 1s22s22p63s23p63d84s24p6
Zadanie 4
How many ions are present in 142 g of Na2SO4? M(Na2SO4) = 142 g mol−1 A. 1 B. 3 C. 6.02 × 1023 D. 1.81 × 1024
Zadanie 5
What is the empirical formula of an alcohol with 60.0 % mass carbon and 13.4 % mass hydrogen? A. C3H7 B. C6H16O2 C. C3H8O D. C2H6O
Zadanie 6
What is the correct formula of calcium phosphide? A. Ca3P2 B. Ca2P3 C. CaPO4 D. Ca3(PO4)2
Zadanie 7
Which properties are expected for the compound lithium bromide? A. Not soluble in water, low melting point, does not conduct electricity when solid, does not conduct electricity when molten B. Not soluble in water, low melting point, conducts electricity when…
Zadanie 8
What is the correct electron domain geometry and molecular geometry of NCl3? A. Trigonal planar electron domain geometry, trigonal planar molecular geometry B. Tetrahedral electron domain geometry, trigonal pyramidal molecular geometry C. Trigonal…
Zadanie 9
Which species contains a coordination bond? A. BCl3 B. PH3 C. [NH4]+ D. HCOO−
Zadanie 10
Which molecules are polar? I. CHCl3 II. CH2F2 III. CF4 A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 11
Which classification is correct? A. Alkali metal: rubidium; transition element: platinum; halogen: xenon; noble gas: bromine B. Alkali metal: rubidium; transition element: platinum; halogen: bromine; noble gas: xenon C. Alkali metal: platinum; transition…
Zadanie 12
Which oxide will react with water to produce the most basic solution? A. Potassium oxide B. Calcium oxide C. Sulfur trioxide D. Nitrogen dioxide
Zadanie 13
Which functional groups are present in this molecule? A. Secondary amine, hydroxyl, alkoxy B. Tertiary amine, alcohol, ketone C. Tertiary amine, hydroxyl, alkoxy D. Secondary amine, alcohol, ketone
- Materiał graficzny
Zadanie 14
Which of these molecules are isomers of each other? I. Butanal II. 2-methylpropan-1-ol III. Butan-2-ol A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 15
Which classification is correct for this reaction? 2 Mg(s) + CO2(g) → 2 MgO(s) + C(s), heat is released A. Endothermic; temperature decreases; reactants more stable B. Exothermic; temperature decreases; products more stable C. Exothermic; temperature…
Zadanie 16
What is the sum of the coefficients when this equation is balanced with the smallest whole numbers? A. 20 B. 37 C. 47 D. 53
Zadanie 17
Given the following data: CaO(s) + CO2(g) → CaCO3(s) ΔH = −p kJ 2 Ca(s) + O2(g) → 2 CaO(s) ΔH = −q kJ 2 CaCO3(s) → 2 Ca(s) + 2 C(s) + 3 O2(g) ΔH = +r kJ What is the ΔH of the…
Zadanie 18
What is the effect of decreasing temperature on this Maxwell-Boltzmann energy distribution curve? A. The curve maximum is higher and to the left of A. B. The curve maximum is lower and to the right of A. C. The curve maximum is higher and to the right of A. D.…
- Materiał graficzny
Zadanie 19
Which substances will be present in the reaction vessel at the end of the reaction between 1.5 g of magnesium and 50.0 cm3 of 1.0 mol dm⁻³ hydrochloric acid? Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) A. HCl(aq), MgCl2(aq) B. Mg(s),…
Zadanie 20
What can be produced when pentanoic acid is reduced? A. Pentan-1-one B. Pentan-2-one C. Pentan-1-ol D. Pentan-2-ol
Zadanie 21
Which of these changes will increase the time taken for this reaction to go to completion? Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g) A. Increase the temperature B. Increase the concentration of H2SO4 C. Use powdered zinc instead of zinc granules D.…
Zadanie 22
What can be deduced about this equilibrium reaction from these data? A(g) + B(g) ⇌ 2 C(g) A. It is an exothermic reaction and [products] < [reactants] at equilibrium. B. It is an endothermic reaction and [products] < [reactants] at equilibrium. C. It…
- Tabela do uzupełnienia
Zadanie 23
Which change would shift the position of this equilibrium towards the products? H2(g) + I2(g) ⇌ 2 HI(g) ΔH = −9 kJ mol−1 A. Increase pressure B. Decrease pressure C. Increase temperature D. Decrease temperature
Zadanie 24
Which statement about this reaction is correct? 2 Cl2 + O2 → 2 Cl2O A. Chlorine is the reducing agent. B. Oxygen is the reducing agent. C. Chlorine is reduced. D. Oxygen is oxidized.
Zadanie 25
Which of these reactions will occur spontaneously? I. KI + Br2 II. KBr + Cl2 III. KCl + Br2 A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 26
Which combination is correct for this cell, when nickel is more reactive than silver? A. Cathode: silver; anode: nickel; sign on cathode: -; sign on anode: + B. Cathode: nickel; anode: silver; sign on cathode: -; sign on anode: + C. Cathode: nickel; anode:…
- Materiał graficzny
Zadanie 27
What are the products of the electrolysis of molten lead(II) bromide? A. Product at cathode: lead; product at anode: bromine B. Product at cathode: lead; product at anode: bromide C. Product at cathode: bromine; product at anode: lead D. Product at cathode:…
Zadanie 28
Which equation is correct? A. Cu(s) + H2SO4(aq) → CuSO4(aq) + H2(g) B. Al(s) + H2SO4(aq) → AlSO4(aq) + H2(g) C. Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g) D. Fe(s) + H2SO4(aq) → FeSO4(aq) + H2(l)
Zadanie 29
Which equation shows the first species acting as an electrophile? A. Br− + CH3CH2+ → CH3CH2Br B. H2O + H+ → H3O+ C. CN− + CH3Br → CH3CN + Br− D. AlCl3 + Cl− → AlCl4−
Zadanie 30
What is the product of the reaction between hex-3-ene and steam, H2O(g)? A. Hexan-3-ol B. Hexan-1-ol C. Hexanal D. Hexan-3-one