Cambridge A Level Chemistry 9701 — 2016 Feb/March Paper 1 · Variant 2

Question 1

1 Which compound contains two different elements with identical oxidation states? A HCl O B Mg(OH)2 C Na2SO4 D NH4Cl

Accepted Answer

A

Question 2

2 For the element sulfur, which pair of ionisation energies has the largest difference between them? A third and fourth ionisation energies B fourth and fifth ionisation energies C fifth and sixth ionisation energies D sixth and seventh ionisation energies

Accepted Answer

D

Question 3

3 Which ion has both more electrons than protons and more protons than neutrons? [H = 1 1H;  D = 2 1 H;  O = 16 8 O] A D– B H3O+ C OD– D OH–

Accepted Answer

D

Question 4

4 Which species contains the smallest number of electrons? A B3+ B Be2+ C H– D He+

Accepted Answer

D

Question 5

5 Nitric oxide, NO, and bromine vapour react together according to the following equation. 2NO(g)  +  Br2(g)  →  2NOBr(g) ΔH o= –23 kJ mol–1 The reaction has an activation energy of +5.4 kJ mol–1. What is the correct reaction pathway diagram for this reaction? A B EA enthalpy EA enthalpy ΔH o / kJ mol–1 ΔH o / kJ mol–1 extent of reaction extent of reaction C D EA EA enthalpy enthalpy / kJ mol–1 ΔH o / kJ mol–1 ΔH o extent of reaction extent of reaction

Accepted Answer

D

Question 6

6 Which series shows molecules in order of increasing bond angle? A CH4 → BF3 → NH3 B H2O → CO2 → BF3 C NH3 → CH4 → CO2 D NH3 → CH4 → H2O

Accepted Answer

C

Question 7

7 What is the volume of steam produced when 1.00 g of ice is heated to 323 °C at a pressure of 101 kPa? A 0.27 dm3 B 1.3 dm3 C 2.7 dm3 D 48 dm3

Accepted Answer

C

Question 8

8 Solid carbon dioxide, CO2, is similar to solid iodine, I2, in its structure and properties. Carbon is in Group 14. Silica, SiO2, is a Group 14 compound. Which statement about solid CO2 and solid SiO2 is correct? A Both solids exist in a lattice structure. B Both solids have a simple molecular structure. C Both solids have atoms joined by single covalent bonds. D Both solids change spontaneously to gas at s.t.p.

Accepted Answer

A

Question 9

9 An article in a science magazine contains the following statement. ‘It is lighter than a feather, stronger than steel, yet incredibly flexible and more conductive than copper.’ Which form of carbon is being described? A buckminsterfullerene B diamond C graphene D graphite

Accepted Answer

C

Question 10

10 Which equation has an enthalpy change of reaction which corresponds to the standard enthalpy change of atomisation of chlorine? A 1 Cl 2(g)  →  Cl (g) 2 B 1 Cl 2(l)  →  Cl (g) 2 C Cl 2(g)  →  2Cl (g) D Cl 2(l)  →  2Cl (g)

Accepted Answer

A

Question 11

11 In an experiment, 2.00 mol of hydrogen and 3.00 mol of iodine were heated together in a sealed container and allowed to reach equilibrium at a fixed temperature. The container had a fixed volume of 1.00 dm3. At equilibrium, there were 2.40 mol of iodine present in the mixture. H2(g)  +  I2(g) 2HI(g) What is the value of the equilibrium constant, Kc? A 0.107 B 0.357 C 0.429 D 2.33

Accepted Answer

C

Question 12

12 Consecutive elements X, Y and Z are in Period 3 of the Periodic Table. Element Y has the highest first ionisation energy and the lowest melting point of these three elements. What are the identities of X, Y and Z? A sodium, magnesium, aluminium B magnesium, aluminium, silicon C aluminium, silicon, phosphorus D silicon, phosphorus, sulfur

Accepted Answer

D

Question 13

13 When dealing with a spillage of metallic sodium it is important that no toxic or flammable products are formed. Which material should be used if there is a spillage of metallic sodium? A dilute hydrochloric acid B ethanol C sand D water spray

Accepted Answer

C

Question 14

14 Chlorine gas is widely used to treat contaminated water. Which species present in water when chlorine gas has been added is responsible for killing bacteria? A Cl O2 – B Cl – C HCl D OCl –

Accepted Answer

D

Question 15

15 Which row of the table is correct? shape bonds present ammonia ammonium ammonia ammonium molecule ion molecule ion A pyramidal regular tetrahedral σ σ B pyramidal regular tetrahedral σ π C regular tetrahedral pyramidal σ σ D regular tetrahedral pyramidal π σ

Accepted Answer

A

Question 16

16 Hydrogen chloride gas and hydrogen iodide gas have different thermal stabilities. The difference is due to a difference in the energies of some of the covalent bonds that are involved in the decomposition. Which row identifies the more stable of the two compounds, and gives the correct explanation? identity of the more explanation for the thermally stable compound difference in stability A hydrogen chloride the Cl–Cl bond is stronger than the I–I bond B hydrogen chloride the H–Cl bond is stronger than the H–I bond C hydrogen iodide the Cl –Cl bond is stronger than the I–I bond D hydrogen iodide the H–Cl bond is stronger than the H–I bond

Accepted Answer

B

Question 17

17 Ammonium sulfate, (NH4)2SO4, and ammonium nitrate, NH4NO3, are used as fertilisers. These salts have different percentages by mass of nitrogen. They have the same effect as each other on the pH of neutral soil. Which row is correct? higher percentage effect on pH of soil of nitrogen by mass A ammonium nitrate decrease B ammonium nitrate increase C ammonium sulfate decrease D ammonium sulfate increase

Accepted Answer

A

Question 18

18 River water in a chalky agricultural area contains Ca2+, Mg2+, CO3 2–, HCO3 –, Cl − and NO3 – ions. In a water treatment plant, such water is treated by adding a calculated quantity of calcium hydroxide. What will be precipitated from the river water following the addition of calcium hydroxide? A CaCl 2 B CaCO3 C Ca(NO3)2 D Mg(NO3)2

Accepted Answer

B

Question 19

19 After black and white photographic film has been developed, unreacted silver bromide is removed by reaction with sodium thiosulfate. AgBr  +  2Na2S2O3  →  4Na+  +  Br –  +  [Ag(S2O3)2]3– What is the function of the thiosulfate ion? A to make the silver ions soluble B to oxidise the silver ions C to reduce the bromine D to reduce the silver ions

Accepted Answer

A

Question 20

20 People who take statin drugs to control their blood cholesterol may also take ‘coenzyme Q10’. The diagram shows a simplified structure of one form of this coenzyme. O CH3O CH3O H O n coenzyme Q10 Which row describes this structure correctly? number of π bonds the coenzyme is in one molecule A an aldehyde n + 2 B an aldehyde n + 4 C a ketone n + 2 D a ketone n + 4

Accepted Answer

D

Question 21

21 Geraniol and nerol are compounds found in some flower fragrances. They are isomers of each other. CH3 CH3 C CH2OH C H H2C C H2C C H CH2OH H3C H2C H3C H2C C C C C H3C H H3C H geraniol nerol Which type of isomerism is shown here? A chain B geometrical (cis-trans) C optical D positional

Accepted Answer

B

Question 22

22 A section showing two repeat units of an addition polymer is shown. CH3 CH3 CH3 CH3 C C C C Cl CH3 Cl CH3 What is the identity of the monomer that produced this polymer? A 2-chloro-3-methylbutane B 2-chloro-3-methylbut-2-ene C 2-chloropent-2-ene D 2,4-dichloro-3,3,4,5-tetramethylhexane

Accepted Answer

B

Question 23

23 But-2-ene-1,4-diol is converted in two steps through an intermediate X into oxobutanedioic acid. step 1 step 2 HOCH2CH=CHCH2OH X HO2CCOCH2CO2H hot, acidified KMnO4 but-2-ene-1,4-diol oxobutanedioic acid What could be the reagent for step 1 and what is the intermediate X? reagent for step 1 X A cold, acidified KMnO4 HOCH2CH2CH(OH)CH2OH B hot, acidified K2Cr2O7 HO2CCH=CHCO2H C steam and concentrated H2SO4 HOCH2CH(OH)CH2CH2OH D warm, acidified K2Cr2O7 OHCCH(OH)CH2CHO

Accepted Answer

C

Question 24

24 Hydrogen bromide can be added to T to give compound U. Compound U can be hydrolysed to compound V. step 1 step 2 Br OH T U V Four students, W, X, Y and Z, made the following statements. W All the atoms in a molecule of compound T lie in the same plane. X Compound V contains only one chiral centre. Y Step 1 is an electrophilic addition reaction. Z Step 2 is a nucleophilic substitution reaction. Which two students are correct? A W and Y B W and Z C X and Y D Y and Z

Accepted Answer

D

Question 25

25 Structural isomerism and stereoisomerism should be considered in answering this question. Compound J is reacted with KOH dissolved in ethanol. Three isomeric alkenes with molecular formula C4H8 are formed. What is J? A CH3 CH2 CH2 CH2 Br B CH3 CH CH2 CH3 Br C CH3 CH CH2 Br CH3 CH3 D CH3 C Br CH3

Accepted Answer

B

Question 26

26 Which row correctly shows a primary, a secondary and a tertiary alcohol? primary secondary tertiary CH2OH CH2OH CH2OH A CH2 CHOH CHOH CH3 CH3 CH2OH CH2OH CH3 CH3 B CH3 C H CH3 C OH CH3 C H CH3 CH3 CH2OH CH2OH CH2OH CH2OH C CH3 C H CH3 C CH2OH CH3 C CH2OH H H CH2OH H CH3 CH3 D CH3 C OH CH3 C OH CH3 C OH H H CH3

Accepted Answer

D

Question 27

27 The fragrance compounds of perfumes are often dissolved in solvent Y, which has a molecular formula C7H12O4. It is made by reacting propane-1,2-diol with ethanoic acid in the presence of an acid catalyst. H CH3 HO C C OH H H propane-1,2-diol What is the structure of solvent Y? A B O H CH3 O O H CH3 O C O C C C C C C C H3C H H O CH3 H3C O H H O CH3 C D O H CH3 O O H CH3 O C C C O C C O C C O C H3C O H H CH3 H3C H H CH3

Accepted Answer

D

Question 28

28 Which mixture could be used to produce propyl methanoate? A CH3CH2CO2H and CH3OH B CH3CH2CH2CH2OH and HCO2H C CH3CH2CH2OH and HCO2H D CH3CH2CH2CO2H and CH3OH

Accepted Answer

C

Question 29

29 Which statement about poly(chloroethene) is correct? A The polymer can be cracked to produce chlorinated alkenes. B The polymer has harmless combustion products. C The polymer is readily biodegradable when buried. D The repeat unit of the polymer has an Mr of 97.

Accepted Answer

A

Question 30

30 Which row of the table is correct? increasing number of carbon atoms A ethyl methanoate methyl propanoate pentyl pentanoate propyl butanoate B ethyl methanoate methyl propanoate propyl butanoate pentyl pentanoate C methyl propanoate propyl butanoate ethyl methanoate pentyl pentanoate D propyl butanoate ethyl methanoate pentyl pentanoate methyl propanoate

Accepted Answer

B

Question 31

31 Which molecules have an overall dipole moment? 1 carbon monoxide, CO 2 phosphine, PH3 3 carbon dioxide, CO2

Accepted Answer

B

Question 32

32 The diagram illustrates the enthalpy changes of a set of reactions ΔH = –134 kJ mol–1 R S ΔH = +92 kJ mol–1 ΔH = –75 kJ mol–1 T U Which statements are correct? 1 The enthalpy change for the transformation U → R is + 42 kJ mol–1. 2 The enthalpy change for the transformation T → S is endothermic. 3 The enthalpy change for the transformation R → T is – 33 kJ mol–1.

Accepted Answer

D

Question 33

33 Which statements about reversible reactions are correct? 1 An increase in concentration of a reactant always increases the concentration of the product. 2 An increase in temperature always increases the rate at which the equilibrium is established. 3 An increase in temperature always increases the concentration of the product at equilibrium.

Accepted Answer

B

Question 34

34 A chemist puts a sample of dilute aqueous hydrochloric acid into beaker 1. She adds a sample of zinc and measures the rate of production of hydrogen gas. She then puts a different sample of dilute aqueous hydrochloric acid into beaker 2. She adds a different sample of zinc and measures the rate of production of hydrogen gas. The rate of the reaction in beaker 2 is greater than the rate of the reaction in beaker 1. Which factors could help to explain this observation? 1 The reaction in beaker 1 has a higher activation energy than the reaction in beaker 2. 2 The zinc in beaker 1 is in larger pieces than the zinc in beaker 2. 3 The acid in beaker 1 is at a lower concentration than the acid in beaker 2.

Accepted Answer

C

Question 35

35 In some rice-growing parts of the world, farmers use a combination of paddy fields and a fish farm. Rice paddy fields are flooded for much of the growing cycle and water running off the fields flows through pens where fish are raised. Nitrogen-based fertilisers are generally very soluble in water. Which problems could result from farmers applying excess nitrogen-based fertilisers to their paddy fields? 1 decreased fish production in the fish pens 2 decreased levels of oxygen in the water 3 increased growth of algae in the fish pens

Accepted Answer

A

Question 36

36 A sample containing 0.40 mol of calcium nitrate was decomposed by heating in a roaring Bunsen burner flame until there was no further decomposition. What are the products of this reaction? 1 0.40 mol of calcium oxide 2 0.40 mol of nitrogen, N2(g) 3 0.40 mol of oxygen, O2(g)

Accepted Answer

D

Question 37

37 Which reagents, when used in an excess, can be used to make sodium lactate, CH3CH(OH)CO2Na, from lactic acid, CH3CH(OH)CO2H? 1 Na 2 NaHCO3 3 NaOH

Accepted Answer

C

Question 38

38 Chlorine atoms in the upper atmosphere cause the breakdown of ozone. Cl  +  O3  →  O2  +  Cl O Cl O  +  O  →  Cl  +  O2 Which statements are correct when referring to these chlorine atoms? 1 The chlorine atoms act as catalysts. 2 The chlorine atoms are free radicals. 3 The chlorine atoms are formed by heterolytic fission of a covalent bond in chlorofluorocarbons.

Accepted Answer

B

Question 39

39 An unknown organic compound Z reacts with sodium to give a combustible gas as one product. Z does not give a yellow precipitate with alkaline aqueous iodine. What is a possible identity of Z? 1 ethanoic acid 2 pentan-3-ol 3 propan-1-ol

Accepted Answer

A

Question 40

40 Compound X has the molecular formula C3H6O3. Heating X under reflux with acidified K2Cr2O7 forms HO2CCOCO2H. Reacting X with NaBH4 forms HOCH2CH(OH)CH2OH. What is a possible structural formula for X? 1 HOCH2CH2CO2H 2 HOCH2CH(OH)CHO 3 HOCH2COCH2OH

Accepted Answer

C

Question paper16 pages

Mark scheme2 pages

Questions as text

Q1 · Which compound contains two different elements with identical oxidation states?

Q2 · For the element sulfur, which pair of ionisation energies has the largest difference…

Q3 · Which ion has both more electrons than protons and more protons than neutrons?

Q4 · Which species contains the smallest number of electrons?

Q5 · Nitric oxide, NO, and bromine vapour react together according to the following equation

Q6 · Which series shows molecules in order of increasing bond angle?

Q7 · What is the volume of steam produced when 1.00 g of ice is heated to 323 °C at a pressure…

Q8 · Solid carbon dioxide, CO2, is similar to solid iodine, I2, in its structure and properties

Q9 · An article in a science magazine contains the following statement

Q10 · Which equation has an enthalpy change of reaction which corresponds to the standard…

Q11 · In an experiment, 2.00 mol of hydrogen and 3.00 mol of iodine were heated together in a…

Q12 · Consecutive elements X, Y and Z are in Period 3 of the Periodic Table

Q13 · When dealing with a spillage of metallic sodium it is important that no toxic or…

Q14 · Chlorine gas is widely used to treat contaminated water

Q15 · Which row of the table is correct?

Q16 · Hydrogen chloride gas and hydrogen iodide gas have different thermal stabilities

Q17 · Ammonium sulfate, (NH4)2SO4, and ammonium nitrate, NH4NO3, are used as fertilisers

Q18 · River water in a chalky agricultural area contains Ca2+, Mg2+, CO3 2–, HCO3 –, Cl − and…

Q19 · After black and white photographic film has been developed, unreacted silver bromide is…

Q20 · People who take statin drugs to control their blood cholesterol may also take ‘coenzyme…

Q21 · Geraniol and nerol are compounds found in some flower fragrances

Q22 · A section showing two repeat units of an addition polymer is shown

Q23 · But-2-ene-1,4-diol is converted in two steps through an intermediate X into…

Q24 · Hydrogen bromide can be added to T to give compound U

Q25 · Structural isomerism and stereoisomerism should be considered in answering this question

Q26 · Which row correctly shows a primary, a secondary and a tertiary alcohol?

Q27 · The fragrance compounds of perfumes are often dissolved in solvent Y, which has a…

Q28 · Which mixture could be used to produce propyl methanoate?

Q29 · Which statement about poly(chloroethene) is correct?

Q30 · Which row of the table is correct?

Q31 · Which molecules have an overall dipole moment?

Q32 · The diagram illustrates the enthalpy changes of a set of reactions ΔH = –134 kJ mol–1 R S…

Q33 · Which statements about reversible reactions are correct?

Q34 · A chemist puts a sample of dilute aqueous hydrochloric acid into beaker 1

Q35 · In some rice-growing parts of the world, farmers use a combination of paddy fields and a…

Q36 · A sample containing 0.40 mol of calcium nitrate was decomposed by heating in a roaring…

Q37 · Which reagents, when used in an excess, can be used to make sodium lactate…

Q38 · Chlorine atoms in the upper atmosphere cause the breakdown of ozone

Q39 · An unknown organic compound Z reacts with sodium to give a combustible gas as one product

Q40 · Compound X has the molecular formula C3H6O3

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