Zadanie 1
Which quantity is measured in g mol−1? A. Relative molecular mass B. Amount of substance C. Avogadro constant D. Molar mass
Chemistry SL Paper 1, May 2023, TZ1
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Hydrogen peroxide has the molecular formula H2O2. Which statement about this formula is correct? A. It shows that the two oxygen atoms are joined by a double bond B. It is the same as the empirical formula of hydrogen peroxide C. It shows that one mole…
Zadanie 3
Magnesium ribbon of known mass was heated strongly in a crucible, and the heating was repeated until the mass no longer changed. The final mass of the solid was then recorded. Assume that magnesium oxide is the only product. Which of the following can be…
Zadanie 4
A gas sample gave the experimental results below. Which expression gives the molar mass of the gas, in g mol−1? Ideal gas constant R = 8.31 J K−1 mol−1, PV = nRT A. B.…
- Tabela do uzupełnienia
Zadanie 5
What is the maximum number of electrons that can occupy the main energy level n = 3? A. 6 B. 9 C. 18 D. 32
Zadanie 6
How many neutrons and electrons are present in the ion ? A. 14 neutrons and 16 electrons B. 14 neutrons and 10 electrons C. 13 neutrons and 10 electrons D. 14 neutrons and 13 electrons
Zadanie 7
In which row are the blocks of the periodic table correctly given for calcium, iron and chlorine? A. Calcium: p; iron: d; chlorine: s B. Calcium: s; iron: p; chlorine: d C. Calcium: s; iron: d; chlorine: p D. Calcium: d; iron: s; chlorine: p
Zadanie 8
Which of the following statements can be deduced from the period in which an element is placed? I. The number of occupied main energy levels II. The number of protons in the nucleus III. The number of electrons in the outer energy level A. I only B. I and II…
Zadanie 9
An element has the electron configuration 1s2 2s2 2p6 3s2 3p4. How many electrons are gained or lost when an atom of this element forms an ionic bond? A. Four electrons lost B. Two electrons lost C. Four electrons gained D. Two electrons gained
Zadanie 10
Four solids, P, Q, R and S, were tested. The results are shown in the table. Which solid most likely has an ionic lattice structure? A. P B. Q C. R D. S
- Tabela do uzupełnienia
Zadanie 11
Magnesium has a higher melting point than sodium. Which statement best explains this? A. Magnesium atoms have a greater relative atomic mass than sodium atoms B. Magnesium has a lower first ionization energy than sodium C. Magnesium ions have a larger radius…
Zadanie 12
In which species does the central atom have fewer than eight valence electrons? A. AlCl3 B. CCl4 C. NH4+ D. H3O+
Zadanie 13
Each of the two bonds between oxygen atoms in an ozone molecule, O3, has a bond order of 1.5, whereas the bond between the oxygen atoms in an oxygen molecule, O2, has a bond order of 2. Which allotrope has the longer bond between oxygen atoms,…
Zadanie 14
A student burned ethanol under a beaker of water and recorded the results below. Which expression gives the enthalpy of combustion of ethanol, in kJ mol−1, according to these data? A. B.…
- Tabela do uzupełnienia
Zadanie 15
Solid sodium hydroxide, NaOH, is dissolved in water and the temperature of the solution increases. Which diagram shows the enthalpy change for dissolving the solid in water? A. Diagram A B. Diagram B C. Diagram C D. Diagram D
- Materiał graficzny
Zadanie 16
The solid curve in the enthalpy profile below is for a reaction carried out under one set of conditions. The dashed curve is obtained when the same reaction is carried out with one change. Which change is represented by the dashed curve? A. A higher…
- Materiał graficzny
Zadanie 17
The temperature of a sample of an ideal gas falls from 600 K to 150 K. How does the average kinetic energy of the gas particles change? A. It decreases by a factor of 2 B. It decreases by a factor of 4 C. It decreases by a factor of 16 D. It does not change…
Zadanie 19
Which products are formed when dilute hydrochloric acid reacts with solid calcium carbonate? A. Calcium chloride and water B. Calcium chloride, carbon dioxide and water C. Calcium chloride and hydrogen D. Calcium hydroxide and carbon dioxide
Zadanie 20
Which row correctly describes a weak Brønsted–Lowry acid? A. Ionizes only partially; its conjugate base is relatively strong B. Ionizes almost completely; its conjugate base is relatively strong C. Ionizes almost completely; its conjugate base is very weak D.…
Zadanie 21
Which change involves the oxidation of chlorine? A. Cl2 → Cl− B. ClO4− → ClO3− C. Cl2 → ClO3− D. HCl → Cl−
Zadanie 22
What is the formula of iron(III) sulfide? A. FeS B. Fe3S2 C. Fe2(SO4)3 D. Fe2S3
Zadanie 23
Which row describes an electrolytic cell? A. The anode is positive; the overall reaction is non-spontaneous B. The anode is negative; the overall reaction is spontaneous C. The anode is negative; the overall reaction is non-spontaneous D. The anode is…
Zadanie 24
Which formula represents an ester? A. CH3CH2OCH2CH3 B. CH3COOCH2CH3 C. CH3CH2CONH2 D. CH3CH2COOH
Zadanie 25
Which statement best explains why the boiling points of the straight-chain alkanes rise from methane to pentane? A. The carbon–hydrogen bonds become stronger B. Longer molecules have more electrons, so the London (dispersion) forces between them are stronger…
Zadanie 27
Bromine water, which is orange, is added to four organic compounds in the dark. In which case does the orange colour disappear? A. Pentane B. Pentan-2-ol C. Pent-2-ene D. Pentanoic acid
Zadanie 28
A student determined the enthalpy of combustion of a fuel as −680 kJ mol−1. The literature value is −850 kJ mol−1. What is the percentage error of the experimental result? A. 20 % B. 25 % C. 80 % D. 125 %
Zadanie 29
Which source of error would be reduced by repeating the measurement and calculating the mean of the results? A. A balance reads 0.05 g too high for every object placed on it B. The student's judgement of the moment at which a cross disappears differs from…