Zadanie 1
Lead(II) bromide is electrolysed in the molten state at 400 °C. Lead melts at 327 °C and lead(II) bromide melts at 371 °C; bromine boils at 59 °C. Which is the correct equation for the overall reaction? A. PbBr2(l) → Pb(l) + Br2(g) B.…
Chemistry SL Paper 1, May 2023, TZ2
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Dodaj cały arkusz do zestawuZadanie 2
What is the mass of one molecule of white phosphorus, P4? Use NA = 6.02 × 1023 mol−1. A. 5.1 × 10−23 g B. 2.1 × 10−22 g C. 4.9 × 1021 g D. 7.5 × 1025 g
Zadanie 3
50 cm3 of gas X reacts with 20 cm3 of gas Y to form 20 cm3 of a gaseous product and leaves 10 cm3 of X unreacted. All volumes are measured at the same temperature and pressure. What is the empirical formula of…
Zadanie 4
The pressure p of a fixed mass of an ideal gas was measured at constant temperature for several different volumes V. Which graph shows p plotted against 1/V? A. Graph A B. Graph B C. Graph C D. Graph D
- Materiał graficzny
Zadanie 5
Which diagram shows the ground-state electron configuration of the 3s and 3p sublevels of a phosphorus atom, 3s2 3p3? A. Diagram A B. Diagram B C. Diagram C D. Diagram D
- Materiał graficzny
Zadanie 7
Which is the electron configuration of an atom of an element in group 14, period 4? A. [Ar] 4s2 3d2 B. [Ar] 4s2 3d10 4p2 C. [Ne] 3s2 3p2 D. [Ar] 4s2 3d10 4p4
Zadanie 8
Which properties decrease down group 17, the halogens? I. electronegativity II. first ionization energy III. melting point A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 9
Which compound is both volatile and soluble in water? A. C6H14 B. KBr C. SiO2 D. CH3CH2OH
Zadanie 10
The nitrogen-nitrogen bonds in hydrazine, N2H4, diazene, N2H2, and nitrogen, N2, are N−N, N=N and N≡N. Which row gives these bonds in order of increasing bond strength and in order of increasing bond length? A. Bond…
Zadanie 11
What is the electron domain geometry of phosphine, PH3? A. trigonal planar B. trigonal pyramidal C. tetrahedral D. bent
Zadanie 12
Which sequence shows the bond angles in H2O, NH3 and BF3 in order of increasing size? A. BF3 < NH3 < H2O B. H2O < NH3 < BF3 C. NH3 < H2O < BF3 D. H2O < BF3 < NH3
Zadanie 13
The standard enthalpy change for the following reaction is −92 kJ mol−1. How much energy, in kJ, is released in the reaction below it? H2(g) + Cl2(g) → 2 HCl(g)…
Zadanie 14
What is ΔH, in kJ, for the following reaction? 2 CO(g) + 4 H2(g) → 2 CH3OH(l) Use the enthalpy changes of these reactions. A. +258 B. +314 C. -258 D. -3162
- Tabela do uzupełnienia
Zadanie 15
Hydrogen atoms in the gas phase combine to form a covalent bond: H(g) + H(g) → H2(g) Which statement describes the energy change? A. Energy is absorbed and ΔH is positive B. Energy is released and ΔH is positive C. Energy is released…
Zadanie 16
Curve X (dashed) shows the volume of oxygen formed when 25 cm3 of 1.0 mol dm−3 hydrogen peroxide solution decomposes in the presence of a manganese(IV) oxide catalyst at 25 °C. 2 H2O2(aq) → O2(g) + 2 H2O(l) Which change would…
- Materiał graficzny
Zadanie 17
The potential energy profile of an exothermic reaction is shown. The vertical arrows I, II and III show three energy changes. Which energy changes would be affected by adding a catalyst? A. I and II only B. I and III only C. II and III only D. I, II and III
- Materiał graficzny
Zadanie 18
A saturated solution of magnesium hydroxide contains undissolved solid. Which change will shift the position of the equilibrium to the right? Mg(OH)2(s) ⇌ Mg2+(aq) + 2 OH−(aq) A. Adding more solid Mg(OH)2 B. Adding dilute hydrochloric acid C.…
Zadanie 19
Which reaction is the neutralization of a Brønsted-Lowry acid by a Brønsted-Lowry base? A. Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) B. 2 Mg(s) + O2(g) → 2 MgO(s) C. CuO(s) + H2SO4(aq) → CuSO4(aq) + H2O(l) D.…
Zadanie 20
What is the hydroxide ion concentration, in mol dm−3, of a solution with pH = 9.0 at 298 K? A. 1.0 × 10−9 B. 1.0 × 10−5 C. 1.0 × 105 D. 1.0 × 10−14
Zadanie 21
Which element has more than one oxidation state in its compounds? A. Sodium B. Magnesium C. Fluorine D. Sulfur
Zadanie 22
Which statement describes a voltaic cell? A. It converts electrical energy to chemical energy using a spontaneous redox reaction B. It converts chemical energy to electrical energy using a non-spontaneous redox reaction C. It converts electrical energy to…
Zadanie 23
Which species could be reduced to form elemental sulfur, S? A. H2S B. ZnS C. SO2 D. CS2
Zadanie 24
Which compound is an aromatic ester? A. Compound A B. Compound B C. Compound C D. Compound D
- Materiał graficzny
Zadanie 25
Which products could be obtained by heating isomers of C4H10O under reflux with excess acidified potassium dichromate(VI)? I. 2-methylpropanal II. butanone III. butanoic acid A. I only B. II and III only C. I and III only D. I, II and III
Zadanie 26
What is the preferred IUPAC name of the compound shown? A. 4-methylpentan-3-ol B. 3-methylpentan-2-ol C. 2-methylpentan-3-ol D. 1-isopropylpropan-1-ol
- Materiał graficzny
Zadanie 28
A student determines the formula of hydrated copper(II) sulfate, CuSO4 ⋅ x H2O, by heating a weighed sample until its mass is constant. Which observation would explain a systematic error in the value of x? A. The crucible was always weighed while it was…
Zadanie 29
The graph shows how the concentration of dinitrogen pentaoxide, N2O5, changes with time during its decomposition at constant temperature. What is the average rate of reaction, expressed as the rate of decrease in the concentration of N2O5, over…
- Materiał graficzny