Zadanie 1
How many oxygen atoms are present in 0.0200 mol of aluminium sulfate, Al2(SO4)3? NA = 6.02 × 1023 mol−1 A. 1.20 × 1022 B. 4.82 × 1022 C. 1.44 × 1023 D. 1.44 × 1024
Chemistry SL Paper 1, November 2022
Zadania wzorowane na pytaniach z tego arkusza: te same umiejętności, format i punktacja, inne dane i kontekst. Treści arkusza IB nie publikujemy.
Dodaj cały arkusz do zestawuZadanie 2
Iodine crystals placed in a warm flask turn directly into purple vapour without forming a liquid. Which term describes this change of state? A. Boiling B. Evaporation C. Deposition D. Sublimation
Zadanie 3
How many moles of carbon dioxide are produced by the complete combustion of 14.5 g of butane, C4H10? Mr = 58 A. 0.25 B. 0.50 C. 1.00 D. 1.25
Zadanie 4
A compound has a relative molecular mass of 58. Which is a possible empirical formula of the compound? A. C2H5 B. CH C. C4H10 D. C3H8
Zadanie 5
Which quantities are different between the species and ? A. Number of protons only B. Number of protons and neutrons only C. Number of neutrons and electrons only D. Number of protons, neutrons and electrons
Zadanie 6
Boron has two naturally occurring isotopes. A sample contains 20.0 % boron-10 () and 80.0 % boron-11 (). What is the relative atomic mass of boron in this sample? A. 10.2 B. 10.5 C. 10.8 D. 11.0
Zadanie 7
Which elements are metalloids? I. Silicon II. Antimony III. Bismuth A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 8
Which property of the elements generally increases from left to right across period 3 and decreases down group 17? A. Atomic radius B. Electronegativity C. Metallic character D. Ionic radius
Zadanie 10
Which molecule is polar? A. PCl3 B. BF3 C. CCl4 D. CO2
Zadanie 11
Sulfur dioxide, SO2, has sulfur as the central atom. The electronegativity of sulfur is 2.6 and that of oxygen is 3.4. Which row describes the polarity of the bonds and of the molecule correctly? A. S=O bonds: O is δ − and S is δ +;…
Zadanie 12
A pure metal is mixed with a small amount of a second metal whose atoms have a different radius. The regular arrangement of atoms is distorted, so the layers can no longer glide past one another easily. Which property of the metal will increase as a result? A.…
Zadanie 13
The average bond lengths of three carbon-halogen bonds are shown. What is the order of increasing bond strength? A. C−Cl < C−Br < C−I B. C−I < C−Br < C−Cl C. C−Br < C−I < C−Cl D.…
- Tabela do uzupełnienia
Zadanie 14
What is the enthalpy change of the reaction 2 C(s) + 3 H2(g) → C2H6(g), calculated from the enthalpy changes of the three reactions below? C(s) + O2(g) → CO2(g), ΔH = −394 kJ mol−1 ,…
Zadanie 15
Which statement about heat and temperature is correct? A. Temperature is a measure of the total energy transferred between particles B. Heat is a measure of the average kinetic energy of the particles in a sample C. Temperature is a measure of the total…
Zadanie 16
The graph shows how the concentration of a reactant changes with time. What initial rate of reaction, in mol dm−3 s−1, can be determined from the graph? A. 0.1 B. 0.2 C. 0.5 D. 2.0
- Materiał graficzny
Zadanie 17
Marble chips react with dilute hydrochloric acid. Which combination of changes would decrease the rate of reaction? A. Concentration of acid increased; marble chips replaced by larger chips B. Concentration of acid decreased; marble chips replaced by larger…
Zadanie 19
Equal volumes of 0.050 mol dm−3 ethanoic acid and 0.050 mol dm−3 hydrochloric acid are each titrated with 0.050 mol dm−3 sodium hydroxide solution. Which quantity is the same for the two titrations? A. Initial pH…
Zadanie 20
Which acid has the weakest conjugate base? A. HF B. CH3COOH C. HNO3 D. NH4+
Zadanie 21
A voltaic cell is based on the reaction Zn(s) + Ni2+(aq) → Zn2+(aq) + Ni(s) The half-cells are connected by a salt bridge containing aqueous potassium nitrate. What happens when the cell operates? A. Electrons flow from Ni to Zn; anions in the…
Zadanie 22
Which species is the reducing agent in the reaction below? Cr2O72−(aq) + 14 H+(aq) + 6 Fe2+(aq) → 2 Cr3+(aq) + 6 Fe3+(aq) + 7 H2O(l) A. Cr2O72− B. H+ C. H2O D. Fe2+
Zadanie 23
Molten lead(II) bromide is electrolysed using inert graphite electrodes connected to a DC power supply. Bromine forms at one of the electrodes. Which row is correct for the electrode where bromine forms? A. Anode; positive electrode; electrons leave this…
Zadanie 24
Which of the structures I, II and III are structural isomers of C4H8? A. I and II only B. I and III only C. II and III only D. I, II and III
- Materiał graficzny
Zadanie 25
Which homologous series has the general formula CnH2nO2? A. Alcohols B. Aldehydes C. Ethers D. Carboxylic acids
Zadanie 26
Which conditions best favour the oxidation of butan-1-ol to butanal rather than to butanoic acid? A. Excess oxidizing agent, heated under reflux B. Excess oxidizing agent, heated with the product distilled off as it forms C. Limited oxidizing agent, heated…
Zadanie 27
The cyanide ion, CN−, acts as a nucleophile. With which compound is it most likely to react? A. 1-bromopropane B. Propene C. Benzene D. Propane
Zadanie 28
A student weighs a sample of solid on a balance several times and gets slightly different readings each time. A check with a standard 100.00 g mass shows that the balance always reads 0.30 g too high. Which pair of actions best reduces the effect of the random…