9701_s21_qp_12 - revisedeck

9701_s21_qp_12

A paper of Chemistry, 9701

Questions:

40

Year:

2021

Paper:

1

Variant:

2

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1

Which statement about the Avogadro constant is correct?

2. Atoms, molecules and stoichiometry → 2.2. The mole and the Avogadro constant

2. Atoms, molecules and stoichiometry → 2.1. Relative masses of atoms and molecules

Open

2

Which equation represents the first ionisation energy of iodine?

1. Atomic structure → 1.4. Ionisation energy

Open

3

The structures represent three compounds, each with four carbon atoms per molecule. O X Y OH O Z O–Na+ O O Which row is correct?

4. States of matter → 4.2. Bonding and structure

3. Chemical bonding → 3.7. Dot-and-cross diagrams

Open

4

The structural formula of alliin is shown...

3. Chemical bonding → 3.5. Shapes of molecules

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

Open

5

Flask Q contains 5 dm3 of helium at 12 kPa pressure. Flask R contains 10 dm3 of neon at 6 kPa pressure. If the flasks are connected at constant temperature, what is the final pressure?

4. States of matter → 4.1. The gaseous state: ideal and real gases and \( pV = nRT \)

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

Open

6

Sodium chloride, water and air represent three states of matter – solid, liquid and gas. Which row is correct?

4. States of matter → 4.2. Bonding and structure

4. States of matter → 4.1. The gaseous state: ideal and real gases and \( pV = nRT \)

Open

7

The reaction pathway diagram for the catalysed reaction and the uncatalysed reaction between N2 and H2 is shown...

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

8. Reaction kinetics → 8.3. Homogeneous and heterogeneous catalysts

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

Open

8

Nitrogen and oxygen can react together to form nitrogen monoxide, NO. N2 + O2  2NO H = +180 kJ mol–1 What is the bond energy of the bond between the atoms in NO?

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

12. Nitrogen and sulfur → 12.1. Nitrogen and sulfur

Open

9

The equation for a redox reaction is shown...

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

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10

3.60 moles of hydrogen gas and 2.00 moles of iodine vapour are placed in a reaction vessel which is then sealed and maintained at a constant temperature. The equation for the reaction is shown...

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

4. States of matter → 4.1. The gaseous state: ideal and real gases and \( pV = nRT \)

Open

11

Two chemicals, X and Y, react together in solution to give product Z. The rate of formation of product Z at the start of the reaction was measured in five experiments, 1–5, using various concentrations of X and Y. 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

Open

12

A sample of SiCl 4 is added to cold water. Which statement describes the mixture formed at the end of the reaction?

11. Group 17 → 11.4. The reactions of chlorine

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

16. Hydroxy compounds → 16.1. Alcohols

Open

13

L and M are elements in Period 3 of the Periodic Table. ● The oxide of L is a solid at room temperature. This oxide has a giant structure. ● The chloride of L does not react with water. ● Argon is the only element in Period 3 with a lower melting point than M. Which formula represents a compound of elements L and M?

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

4. States of matter → 4.2. Bonding and structure

Open

14

A farmer requires a solid compound to raise the pH of the soil in a field from 5.5 to above 6.0. Which compound could the farmer use?

12. Nitrogen and sulfur → 12.1. Nitrogen and sulfur

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

Open

15

Z is an anhydrous compound of a Group 2 element. When it is heated, Z undergoes thermal decomposition to produce two different gases. Z has relatively low thermal stability compared to other Group 2 compounds containing the same anion as Z. What is compound Z?

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

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

Open

16

Which row gives mixtures that both result in the oxidation of a halide ion?

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

Open

17

Chlorine gas is widely used to treat contaminated water. When chlorine is added to water, which chemical species present is responsible for killing bacteria?

11. Group 17 → 11.4. The reactions of chlorine

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

Open

18

What is an environmental consequence of the uncontrolled use of nitrate fertilisers?

12. Nitrogen and sulfur → 12.1. Nitrogen and sulfur

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19

Ammonia gas, NH3, and hydrogen sulfide gas, H2S, react together to form the salt ammonium sulfide, (NH4)2S. Ammonium sulfide dissolves in water to produce an orange alkaline solution. (NH4)2SNH3+ NH4SHThe addition of NaOHto this solution produces a gas, X. The addition of HCl to a separate portion of this solution produces a gas, Y. X and Y could represent different gases or identical gases. What are the identities of X and Y?

12. Nitrogen and sulfur → 12.1. Nitrogen and sulfur

4. States of matter → 4.1. The gaseous state: ideal and real gases and \( pV = nRT \)

Open

20

Compound P is treated with an excess of hydrogen gas in the presence of a nickel catalyst. The product Q is fully saturated. compound P What is the number of chiral carbon atoms in the product Q?

14. Hydrocarbons → 14.2. Alkenes

14. Hydrocarbons → 14.1. Alkanes

17. Carbonyl compounds → 17.1. Aldehydes and ketones

Open

21

Hexadeca-10,12-dien-1-ol is produced by silk moths from hexadecanoic acid in a three-step enzymic process. OH step 3 OH O step 2 OH step 1 hexadecanoic acid OH O O Which row contains correct descriptions of the three steps?

21. Organic synthesis → 21.1. Organic synthesis

17. Carbonyl compounds → 17.1. Aldehydes and ketones

Open

22

Compound X can be converted into compound Y in a single step. O O OH X compound Y What could be the identity of X?

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

17. Carbonyl compounds → 17.1. Aldehydes and ketones

Open

23

Methane and bromine react by free radical substitution. P and Q are involved in the reaction mechanism. P and Q: ● are both involved in propagation steps as reactants ● are both involved in termination steps as reactants. What could be P and Q?

14. Hydrocarbons → 14.1. Alkanes

13. An introduction to AS Level organic chemistry → 13.2. Characteristic organic reactions

Open

24

A few drops of 2-bromopropane were placed in a test-tube. An equal volume of aqueous silver nitrate was added. A precipitate was formed. The experiment was repeated with 2-iodopropane. Which row is correct?

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

15. Halogen compounds → 15.1. Halogenoalkanes

Open

25

Sodium methoxide, Na+CH3O–, reacts with 2-chloro-2-methylpropane in a nucleophilic substitution reaction. The nucleophile is the CH3O– ion. Which row is correct?

15. Halogen compounds → 15.1. Halogenoalkanes

13. An introduction to AS Level organic chemistry → 13.2. Characteristic organic reactions

17. Carbonyl compounds → 17.1. Aldehydes and ketones

Open

26

Alcohol X reacts with concentrated sulfuric acid to produce a mixture of products. Two of the products are structural isomers of each other. What could be X?

16. Hydroxy compounds → 16.1. Alcohols

18. Carboxylic acids and derivatives → 18.2. Esters

14. Hydrocarbons → 14.2. Alkenes

Open

27

Which reaction will form a strong organic base?

15. Halogen compounds → 15.1. Halogenoalkanes

17. Carbonyl compounds → 17.1. Aldehydes and ketones

Open

28

Which reaction mechanism for the formation of C2H5CH(OH)(CN) is correct?

17. Carbonyl compounds → 17.1. Aldehydes and ketones

16. Hydroxy compounds → 16.1. Alcohols

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

Open

29

The synthesis shown...

21. Organic synthesis → 21.1. Organic synthesis

17. Carbonyl compounds → 17.1. Aldehydes and ketones

Open

30

The molecular formula of Z is C4H8O. The infra-red spectrum of Z is shown...

2. Atoms, molecules and stoichiometry → 2.3. Formulas

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

Open

31

In which ions are the number of electrons equal to the number of neutrons?

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

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

Open

32

Compound X is a straight chain hydrocarbon with an Mr of 84. What can be determined about X?

2. Atoms, molecules and stoichiometry → 2.3. Formulas

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

Open

33

When a sample of ammonium chloride is warmed it decomposes into ammonia and hydrogen chloride gas. NH4Cl  NH3+ HCl reaction 1 heat cold surface solid ammonium chloride solid ammonium chloride When the mixture of hot ammonia and hydrogen chloride gases hit a cold surface, a white solid of ammonium chloride reforms. Which statements are correct?

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

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

Open

34

Hydrogen chloride gas is formed by the reaction shown...

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

8. Reaction kinetics → 8.1. Rate of reaction

4. States of matter → 4.1. The gaseous state: ideal and real gases and \( pV = nRT \)

Open

35

Which oxides will cause a change in pH when added to water?

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

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

Open

36

Which reaction routes can be used to make a pure sample of barium sulfate?

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

18. Carboxylic acids and derivatives → 18.2. Esters

Open

37

Cortisone is a synthetic hormone. O HO cortisone H H H O OH OH Which classes of alcohol does this molecule contain?

16. Hydroxy compounds → 16.1. Alcohols

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

Open

38

Which changes are commonly involved in the formation of an addition polymer?

20. Polymerisation → 20.1. Addition polymerisation

Open

39

Which alcohols can be oxidised to form an organic compound which will give coloured precipitates with both 2,4-dinitrophenylhydrazine reagent and alkaline aqueous iodine?

16. Hydroxy compounds → 16.1. Alcohols

17. Carbonyl compounds → 17.1. Aldehydes and ketones

Open

40

Which mixtures form a carboxylic acid as one of the products?

18. Carboxylic acids and derivatives → 18.1. Carboxylic acids

18. Carboxylic acids and derivatives → 18.2. Esters

Open