9701_w22_qp_13 - revisedeck

9701_w22_qp_13

A paper of Chemistry, 9701

Questions:

40

Year:

2022

Paper:

1

Variant:

3

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1

Which sample contains the same number of the named species as the number of molecules in 35.5 g of chlorine?

22. Analytical techniques → 22.2. Mass spectrometry

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2

Mixture R consists of one mole of C3H6 and one mole of C4H6. What is the minimum number of moles of oxygen molecules needed for complete combustion of mixture R?

2. Atoms, molecules and stoichiometry → 2.4. Reacting masses and volumes (of solutions and gases)

7. Equilibria → 7.1. Chemical equilibria: reversible reactions, dynamic equilibrium

14. Hydrocarbons → 14.1. Alkanes

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3

Which statement about the electrons in a ground state carbon atom is correct?

1. Atomic structure → 1.3. Electrons, energy levels and atomic orbitals

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4

For the element sulfur, which pair of ionisation energies has the largest difference between them?

1. Atomic structure → 1.4. Ionisation energy

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5

How many  bonds are present in one H–C≡C–C(CH3)=CH(CH3) molecule?

3. Chemical bonding → 3.4. Covalent bonding and coordinate (dative covalent) bonding

13. An introduction to AS Level organic chemistry → 13.3. Shapes of organic molecules; σ and π bonds

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6

Which molecule has an equal number of bonding electrons and lone-pair electrons?

1. Atomic structure → 1.3. Electrons, energy levels and atomic orbitals

3. Chemical bonding → 3.4. Covalent bonding and coordinate (dative covalent) bonding

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7

The table shows properties of four solids held together by different types of bonding. Which row correctly describes the properties of a solid with a giant covalent structure?

4. States of matter → 4.2. Bonding and structure

3. Chemical bonding → 3.6. Intermolecular forces, electronegativity and bond properties

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8

The carbonate of an s-block element is reacted with an excess of hydrochloric acid. 0.833 g of the carbonate releases 200 cm3 of gas, measured under room conditions. What is the identity of the metal carbonate?

9. The Periodic Table: chemical periodicity → 9.2. Periodicity of chemical properties of the elements in Period 3

10. Group 2 → 10.1. Similarities and trends in the properties of the Group 2 metals, magnesium to barium, and their compounds

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9

The enthalpy changes of formation, , of both PCl 3 and PCl 5 are exothermic. PCl 3 reacts with chlorine. PCl 3+ Cl 2 PCl 5= –124 kJ mol–1 Which pair of statements is correct?

5. Chemical energetics → 5.1. Enthalpy change, \(\Delta H\)

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10

A student mixes 25.0 cm3 of 0.350 mol dm–3 sodium hydroxide solution with 25.0 cm3 of 0.350 mol dm–3 hydrochloric acid. The temperature increases by 2.5 C. No heat is lost to the surroundings. The final mixture has a specific heat capacity of 4.2 J cm–3 K–1. What is the molar enthalpy change for the reaction?

5. Chemical energetics → 5.1. Enthalpy change, \(\Delta H\)

Open

11

Ammonium ions are converted into nitrate ions by bacteria. What is the change in the oxidation number of nitrogen?

6. Electrochemistry → 6.1. Redox processes: electron transfer and changes in oxidation number (oxidation state)

Open

12

Sodium dichromate(, Na2Cr2O7, reacts with hydrogen peroxide, H2O2, producing Cr3+ ions, water and oxygen. What is the correctly balanced ionic equation for this reaction?

2. Atoms, molecules and stoichiometry → 2.3. Formulas

11. Group 17 → 11.3. Some reactions of the halide ions

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13

In which equilibrium reaction is the position of equilibrium moved to the right-hand side by increasing the temperature and also by decreasing the pressure?

7. Equilibria → 7.1. Chemical equilibria: reversible reactions, dynamic equilibrium

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14

Ethanol is produced industrially by reacting ethene and steam. C2H4+ H2OC2H5OHKp has a value of 1.8  10–5 and the partial pressures of the reactants at equilibrium are shown...

7. Equilibria → 7.1. Chemical equilibria: reversible reactions, dynamic equilibrium

Open

15

A large excess of magnesium ribbon is added to dilute hydrochloric acid and the volume of hydrogen gas produced is measured as the reaction proceeds. The reaction is exothermic. The results are shown...

8. Reaction kinetics → 8.1. Rate of reaction

8. Reaction kinetics → 8.2. Effect of temperature on reaction rates and the concept of activation energy

5. Chemical energetics → 5.1. Enthalpy change, \(\Delta H\)

Open

16

Measurements are made to determine the activation energy, Ea, of a reaction. The diagram shows Ea on the Boltzmann distribution at temperature T1. number of molecules Ea energy Measurements are then made at a higher temperature, T2. Which diagram correctly shows the Boltzmann distribution and Ea at T2?

8. Reaction kinetics → 8.2. Effect of temperature on reaction rates and the concept of activation energy

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17

The electrical conductivities of two compounds, Y and Z, are shown...

9. The Periodic Table: chemical periodicity → 9.1. Periodicity of physical properties of the elements in Period 3

9. The Periodic Table: chemical periodicity → 9.2. Periodicity of chemical properties of the elements in Period 3

Open

18

Which row describes the relative sizes of the ionic radii of Na+, Mg2+ and S2–?

1. Atomic structure → 1.1. Particles in the atom and atomic radius

2. Atoms, molecules and stoichiometry → 2.3. Formulas

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19

The oxides BaO, CaO, MgO and SrO all produce alkaline solutions when added to water. Which oxide produces the saturated solution with the highest pH?

7. Equilibria → 7.2. Brønsted–Lowry theory of acids and bases

10. Group 2 → 10.1. Similarities and trends in the properties of the Group 2 metals, magnesium to barium, and their compounds

9. The Periodic Table: chemical periodicity → 9.2. Periodicity of chemical properties of the elements in Period 3

Open

20

Which row is correct?

10. Group 2 → 10.1. Similarities and trends in the properties of the Group 2 metals, magnesium to barium, and their compounds

1. Atomic structure → 1.4. Ionisation energy

Open

21

Which statement about Group 17 elements and compounds is correct?

11. Group 17 → 11.1. Physical properties of the Group 17 elements

11. Group 17 → 11.3. Some reactions of the halide ions

11. Group 17 → 11.2. The chemical properties of the halogen elements and the hydrogen halides

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22

Chlorine is bubbled through 100 cm3 of hot 4.0 mol dm–3 sodium hydroxide until the reaction is complete. 6NaOH+ xCl 2 yNaCl + zNaCl O3+ 3H2OWhich row is correct?

11. Group 17 → 11.4. The reactions of chlorine

2. Atoms, molecules and stoichiometry → 2.4. Reacting masses and volumes (of solutions and gases)

Open

23

Which statement about ammonia or the ammonium ion is correct?

12. Nitrogen and sulfur → 12.1. Nitrogen and sulfur

11. Group 17 → 11.3. Some reactions of the halide ions

15. Halogen compounds → 15.1. Halogenoalkanes

Open

24

Sulfur dioxide can be catalytically oxidised by an oxide of nitrogen in the atmosphere. Which reaction shows how the catalyst is reformed?

12. Nitrogen and sulfur → 12.1. Nitrogen and sulfur

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25

Separate 1.0 g samples of Na2O, MgO, Al 2O3, SiO2, NaCl, MgCl 2, Al 2Cl 6 and SiCl 4 are added to separate beakers containing water and stirred. The number of beakers containing a white solid is Q. An excess of NaOHis then added to each beaker and stirred. The number of beakers now containing a white solid is R. Which row is correct?

11. Group 17 → 11.4. The reactions of chlorine

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26

Which pair of alcohols are isomers of each other?

13. An introduction to AS Level organic chemistry → 13.4. Isomerism: structural isomerism and stereoisomerism

16. Hydroxy compounds → 16.1. Alcohols

Open

27

How many chiral carbon atoms are there in one molecule of 2,2,4,5-tetramethylhexan-3-ol?

13. An introduction to AS Level organic chemistry → 13.4. Isomerism: structural isomerism and stereoisomerism

13. An introduction to AS Level organic chemistry → 13.1. Formulas, functional groups and the naming of organic compounds

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28

Which pair of reagents react together in a redox reaction?

6. Electrochemistry → 6.1. Redox processes: electron transfer and changes in oxidation number (oxidation state)

18. Carboxylic acids and derivatives → 18.2. Esters

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29

The structure of santonin is shown...

17. Carbonyl compounds → 17.1. Aldehydes and ketones

16. Hydroxy compounds → 16.1. Alcohols

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30

Compound R can be formed from 1-bromopropane using a nucleophilic substitution reaction followed by an oxidation reaction. What is the identity of R?

15. Halogen compounds → 15.1. Halogenoalkanes

14. Hydrocarbons → 14.2. Alkenes

Open

31

Three colourless liquids with the following formulae are contained in separate unlabelled bottles. CH3CH2CO2H CH3CH(OH)CO2H CH3COCO2H Which two tests, carried out on separate samples of each liquid, will successfully identify each liquid?

17. Carbonyl compounds → 17.1. Aldehydes and ketones

16. Hydroxy compounds → 16.1. Alcohols

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32

An alcohol, X, reacts with a dicarboxylic acid, Y, to form a double ester, Z. The diagram shows the structure of the ester. O Z O O O Which row about the reactants forming ester Z is correct?

16. Hydroxy compounds → 16.1. Alcohols

18. Carboxylic acids and derivatives → 18.2. Esters

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33

W reacts with alkaline I2to form a yellow precipitate and CH3CH2CO2 – ions. Which row identifies W and the yellow precipitate?

17. Carbonyl compounds → 17.1. Aldehydes and ketones

16. Hydroxy compounds → 16.1. Alcohols

2. Atoms, molecules and stoichiometry → 2.3. Formulas

Open

34

Ethanal reacts with hydrogen cyanide in the presence of KCN to produce a hydroxynitrile. What is the first step in the mechanism of this reaction?

19. Nitrogen compounds → 19.2. Nitriles and hydroxynitriles

17. Carbonyl compounds → 17.1. Aldehydes and ketones

Open

35

Structural isomerism and stereoisomerism should be considered when answering this question. How many isomeric compounds with molecular formula C5H6O4 contain two –CO2H groups and one C=C double bond?

13. An introduction to AS Level organic chemistry → 13.1. Formulas, functional groups and the naming of organic compounds

13. An introduction to AS Level organic chemistry → 13.4. Isomerism: structural isomerism and stereoisomerism

Open

36

Compound X reacts with ethanoic acid in the presence of an H+ catalyst to produce the compound shown...

13. An introduction to AS Level organic chemistry → 13.1. Formulas, functional groups and the naming of organic compounds

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37

2-bromopropane reacts with hot ethanolic sodium hydroxide. Which substance is the major product of this reaction?

14. Hydrocarbons → 14.2. Alkenes

15. Halogen compounds → 15.1. Halogenoalkanes

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38

Which compounds can be used to make Y in a single-step reaction?

21. Organic synthesis → 21.1. Organic synthesis

14. Hydrocarbons → 14.1. Alkanes

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39

The monomer buta-1,3-diene can undergo addition polymerisation in various ways. Two of the polymers that can be made are called cis-poly(buta-1,3-diene) and trans-poly(buta-1,3-diene). In these names cis and trans have their usual meanings. What is the structure of the repeat unit of cis-poly(buta-1,3-diene)?

20. Polymerisation → 20.1. Addition polymerisation

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40

In the mass spectrum of a compound, Z, the relative abundances of the M and M+1 peaks are in the ratio 13 : 1. What is compound Z?

22. Analytical techniques → 22.2. Mass spectrometry

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