Zadanie 1
A sample of ammonium sulfate, (NH4)2SO4, has a mass of 66.1 g. Mr = 132.17 How many moles of ammonium ions are present in the sample? A. 0.25 B. 0.50 C. 1.00 D. 1.50
Chemistry SL Paper 1, November 2024
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Antimony(III) sulfide burns in air to form antimony(III) oxide and sulfur dioxide. Sb2S3(s) + O2(g) → Sb2O3(s) + SO2(g) The equation is balanced using the smallest whole-number coefficients. What is the sum of all the coefficients? A. 8 B. 15 C. 19 D.…
Zadanie 3
Magnesium burns in oxygen. 2 Mg(s) + O2(g) → 2 MgO(s) What mass of magnesium oxide, in g, forms when 2.43 g of magnesium reacts with 3.41 dm3 of oxygen at STP? Mr(MgO) = 40.31; molar volume = 22.7 dm3 mol−1 A.…
Zadanie 4
A steel cylinder of volume 5.0 dm3 holds 2.0 g of helium at 27 °C. Ar(He) = 4.0; R = 8.31 J K−1 mol−1; PV = nRT Which expression gives the pressure of the helium, in Pa? A.…
Zadanie 5
A sample of element X consists of two isotopes. Their mass numbers and relative abundances are given in the table. What is the relative atomic mass of X? A. 69.0 B. 69.8 C. 70.0 D. 70.2
- Tabela do uzupełnienia
Zadanie 6
Which statement correctly compares infrared and ultraviolet radiation? A. Infrared radiation has a longer wavelength and a lower photon energy than ultraviolet radiation. B. Infrared radiation has a longer wavelength and a higher frequency than ultraviolet…
Zadanie 7
Which statements about the organization of the elements in the periodic table are correct? I. Elements with atomic numbers 3, 11 and 19 have atoms with the same number of electrons in the outer energy level. II. Elements with atomic numbers 7, 15 and 33 have…
Zadanie 8
Which period 3 oxide forms a solution with pH > 7 when it is added to water? A. Al2O3 B. Na2O C. SiO2 D. SO2
Zadanie 9
A hydrogen ion reacts with a water molecule to form a hydronium ion. H2O + H+ → H3O+ What type of bond forms between the oxygen atom and the hydrogen ion? A. Ionic bond B. Hydrogen bond C. Covalent bond in which each atom supplies one electron to the…
Zadanie 10
Which row correctly states the types of intermolecular force present between molecules of ethane, methylamine and fluoromethane? A. Ethane: London (dispersion) forces only; methylamine: London forces, dipole-dipole forces and hydrogen bonding; fluoromethane:…
Zadanie 11
The structure of a compound is shown below. Atom (1) is the nitrogen atom of the ring, atom (2) is the ring carbon bonded to the triple bond and atom (3) is the terminal carbon of the triple bond. What is the molecular geometry around each of the numbered…
- Materiał graficzny
Zadanie 12
Which statements about alloys are correct? I. Alloys can contain non-metallic elements as well as metals. II. Alloys are usually softer than the pure metals they contain, because their layers slide over each other more easily. III. Atoms of different sizes…
Zadanie 14
Consider the following equations. H2(g) + Cl2(g) → 2 HCl(g) ΔH⊖ = −x kJ C(s) + 2 Cl2(g) → CCl4(g) ΔH⊖ = −y kJ 2 C(s) + H2(g) → C2H2(g) ΔH⊖ = +z kJ What…
Zadanie 15
Two samples of the same gas, at temperatures T1 and T2 where T2 > T1, have the Maxwell–Boltzmann distributions of kinetic energy shown. Which diagram is correct? A. Diagram A B. Diagram B C. Diagram C D. Diagram D
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Zadanie 16
50.0 cm3 of copper(II) sulfate solution of concentration 0.200 mol dm−3 is placed in an insulated cup. Excess zinc powder is added and the mixture is stirred. The maximum temperature increase is 10.4 °C.…
Zadanie 17
An excess of calcium carbonate lumps was added to a beaker of dilute hydrochloric acid, HCl(aq). Carbon dioxide escapes from the beaker, so the mass of the beaker and its contents was recorded against time to give curve 1. Which change could give curve…
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Zadanie 18
Ammonia dissolves in water as shown in the equation below. What will happen if the temperature of the solution is increased? NH3(g) + H2O(l) ⇌ NH4+(aq) + OH−(aq) ΔH⊖ = −31 kJ mol−1 A. The equilibrium shifts to the left…
Zadanie 19
The pH of solution P is 3 and the pH of solution Q is 9. What is the ratio of their H3O+ concentrations? A. [H3O+] is 3 times higher in P than in Q. B. [H3O+] is 6 times higher in P than in Q. C. [H3O+] is 1 × 103 times…
Zadanie 20
Which of these species has the weakest conjugate base? A. CH3COOH B. NH4+ C. H2O D. HNO3
Zadanie 21
In which reaction does N2 act as a reducing agent? A. N2(g) + 3 H2(g) → 2 NH3(g) B. 3 Mg(s) + N2(g) → Mg3N2(s) C. N2(g) + O2(g) → 2 NO(g) D. 6 Li(s) + N2(g) → 2 Li3N(s)
Zadanie 22
A voltaic cell is constructed from a half-cell of metal A in a solution of A2+ ions and a half-cell of metal B in a solution of B2+ ions. The half-cells are joined by a salt bridge and an external wire. Metal B is the more reactive metal. What…
Zadanie 23
Aqueous bromine, Br2(aq), is added separately to aqueous potassium chloride and to aqueous potassium iodide. Which statement is correct? A. Bromine reacts with both solutions, oxidizing the chloride ions and the iodide ions. B. Bromine reacts with the…
Zadanie 24
Which products are formed when hex-3-ene reacts separately with hydrogen bromide, HBr, to give X, and with bromine, Br2, to give Y? A. X: 2-bromohexane; Y: 3,4-dibromohexane B. X: 3,4-dibromohexane; Y: 3-bromohexane C. X: 3-bromohexane; Y:…
- Materiał graficzny
Zadanie 25
Which compound can be oxidized to a carboxylic acid by heating under reflux with an excess of an acidified oxidizing agent? A. CH3CH(OH)CH2CH3 B. (CH3)3COH C. (CH3)2CHCH2OH D. CH3COCH2CH3
Zadanie 26
How many structural isomers of the alkane with molecular formula C6H14 exist? A. 3 B. 4 C. 5 D. 6
Zadanie 27
What is the IUPAC name of the compound shown? A. 4-chloro-5-methylhexan-2-one B. 3-chloro-2-methylhexan-5-one C. 5-methyl-4-chlorohexan-2-one D. 4-chloro-5-methylhexan-2-ol
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Zadanie 28
Which functional groups are present in the compound shown? A. Carboxyl, hydroxyl and primary amino B. Ester, ether and primary amino C. Ester, hydroxyl and secondary amino D. Ester, hydroxyl and primary amino
- Materiał graficzny
Zadanie 30
A student determines the concentration of a solution of hydrochloric acid by titration. The same titration is repeated five times, and the titres are scattered both above and below the mean, because the student finds it difficult to judge the exact point at…