Quick Revision Crosswords

First Year GCE A level (or AS) Chemistry

Puzzles & Solutions

Each of these crosswords draws on materialselected from the whole of AS (or First Year)

GCE A level Chemistry

Cross

Words

Year 1

CH

EM

IST

RY

1 2 3 4

5

6 7

8

9 10

11

12 13

14 15 16 17

18

19 20

21 22

23 24

25

26 27

Across1Ethyl ethanoate is

isomeric with thisacid. (8)

3Ethene is producedby cracking adistillation fractionof this substance(5,3). (8)

6A free radical (8,4).(12)

9Thermaldecomposition ofPVC gives (5,5).(10)

11Secondary alcoholgroup. (4)

12This class ofcompound containsan NRR groupwhere R representshydrogen and/oralkyl groups whichcan be the same ordifferent. (5)

14The heat changewhen ethene ishydrogenated. (10)

19Teamed up withMaxwell. (9)

20Some of theseinsects produceformic acid fordefence purposes.(4)

23This is its formula,CHOCHO. (10)

25The number ofsodium salts ofphosphoric acid.(5)

26The colour ofnitrogen(IV) oxide(4,5). (9)

27We say this is howmolecules enter theionisation chamberof a massspectrometer (4,4).(8)

Down2The type of reaction

occurring whenethene reacts withbromine. (8)

3The nature of purehydrogen peroxide.(9)

4Contains two carbon-carbon doublebonds. (5)

5This acid is a weakacid but strongerthan ethanoic acid.(10)

7Which requires mostenergy, thebreaking of the HHbond or thebreaking of theHBr bond? (2)

8In aqueous solutionit is used topreserve biologicalspecimens. (8)

10The oxidationnumber of nitrogenin dinitrogentetroxide. (4)

13The type of reactionoccurring whenethane reacts withbromine. (12)

15Limonene is presentin this skin (6,4).(10)

16This compound isvery pungent andsmells of rotten

apples. Its moleculecontains twocarbon atoms, fourhydrogen atomsand an oxygenatom. (7)

17Adding sulphurtrioxide to waterproduces thisphysicalphenomenon. (4)

18Hydrogen peroxideand hydrazine. Agood or poor rocketpropellant? (4)

21In order formolecules to reactthey must? (7)

22Ionising electrons dothis to molecules inthe massspectrometer. (7)

24We say that it isdifficult to do thisto carbon atomsattached to oneanother by a doublebond. (6)

Puzzles:

Xword I

1 2

3

4

5 6

7

8

9

10 11

12 13

14 15

16

17 18

19 20 21

22

23 24

25 26

27

28

29

Across1The crystalline structure of

sodium chloride. (5)3A property of the group I

metals. (4)4The number of moles

making up 230g ofethanol. (4)

5The number of moles in88g of carbon dioxide.(3)

8The colour of potassiumdichromate crystals. (6)

10Proceeds both forwardsand backwards. (10)

12The number of hydrogenatoms in 2-methylbutane.(6)

14Quicksilver. (7)16The appearance of a mass

spectrum resembles oneof these. (8)

17A safety symbol containinga skull and crossboneswarns of this. (5)

19The colour of the aqueouspermanganate ion. (6)

20This reacts violently withwater. (2)

22Colour of aqueous iodine.(5)

23Heat change. (8)27The number of atoms of

fluorine combining withone atom of silicon. (4)

28Adding anhydrous copper(II) sulphate to waterproduces this. (4)

29Converting atoms intocations. (8)

Down2The formula of ethanoic

acid. (11)

3Describing thearrangement of electronsin a metal (3,2,9). (14)

6That component of a massspectrometer whichdeflects & focuses theparticle beam. (6)

7Most inorganic compoundshave high meltingpoints? (4)

9Colour of aqueous iron(II)solutions. (5)

10Average mass of one atomof an element comparedwith one twelfth of anatom of carbon-12. (3)

11A device used inquantitative analysis. (7)

13In the ionisation chamberof a mass spectrometerthe sample exists inwhich physical state? (6)

15Support for glassware. (5)16It burns natural gas. (6)

18Boron-10 and boron-11.(8)

19The common name forpotassium carbonate. (6)

21Used when camping. (6)24Metals occur on this side

of the periodic table. (4)25In the Haber process it

alters the rate of reactionbut does not alter theyield. (4)

26Intermolecular force inliquid ethanol (1,4). (5)

Xword II

1

2 3

4

5 6

7

8

9

10

11 12 13 14

15 16

17 18

19 20 21 22

23

24

Across2Neutron charge

(4)5The number of

neutrons in alithium atom. (4)

7Gaseous state. (6)9Cinnabar is its

main ore. (7)10A First World War

weapon. (8)11Boiling a liquid in

a flask fitted witha vertical watercondenser. (9)

15C4H10 (6)16A way of

comparingatomic masses.(3)

17Unscramble,'sueculn'. (7)

19Adding solidsodiumhydroxide towater producesthis. (4)

21[Kr], 5s1. (8)23The physical state

of sodiumchloride when itwill conductelectricity. (6)

24Most organiccompounds arelow melting? (4)

Down1Tunsten (7)3The energy change

when an atom isionised. (11)

4An allotrope ofcarbon. (8)

6The symbol forthe elementwhose namederives from theLatin for red. (2)

8Solid dissolved inliquid. (6)

10The crystallinestructure oflithium. (5)

12The number ofprotons in thenucleus of aboron atom. (4)

13A constituent ofhaemoglobin. (4)

14Copper flame testcolour. (5)

18Manufacturedfrom commonsalt. (6)

20The number ofelectrons in alithium ion. (3)

21Response. (6)22Named after a

German chemistwho studied theemission spectraof elements. (6)

Xword III

1 2 3

4 5

6 7 8

9 10

11

12

13

14 15

16

17

18

Across1Chlorine is used in the

manufacture of thisplastic. (3)

4When the dioxides ofpotassium and carbonreact they producepotassium carbonateand this gas. (6)

6Potassium dioxide is anexample of one ofthese. (10)

10A white powder used asan insecticide. (3)

11Very concentratedsulphuric acid. (5)

12The number ofelectrons in aberyllium ion. (3)

13A disadvantage ofbutane as a motorfuel. (7)

14The number of moles ofoxygen required tocompletely combusttwo moles of butane.(8)

15The streets of Londonare not paved withthis. (2)

16The common name forNaOH (7,4). (11)

17+420 kJ per mol is anionisation energy ofpotassium. Is it thefirst or the second?(5)

18Reduction of but-1-eneusing a nickel catalystrequires this reactant.(8)

Down2The burning of ethanol

in excess oxygen isone example. (10)

3The standard enthalpyof formation refers toa reaction between -------- in their normalstates. (8)

5An oxide of nitrogen.(2)

7The atomic number ofargon. (8)

8An element originallyextracted fromseaweed. (6)

9Alkanes, alkenes,alcohols, aldehydes,ketones. (16)

15The type of reactionoccurring when HBrcombines with ethene.(8)

16The molecular formulaof 2,2,4-trimethylpentane. (5)

17The number of neutronsin a lithium atom. (4)

18Etches glass. (2)

Xword IV

1 2 3 4 5

6

7 8

9 10 11

12

13 14

15

16

17

18 19 20 21 22

23 24 25

26 27

28 29 30

31

32

33

Across

1 An element in Group VI.(6)

3 The type of reactionoccurring when HBrcombines with ethene. (8)

7 Iodine at 115oC. (7)

9 We use this adjective todescribe a reversiblereaction atequilibrium. (7)

15 A simple aromaticcompound. (7)

16Dichlorodiphenyltrichloroethane. (3)

17 Caesium dioxide is anexample of one ofthese. (10)

19 Glycol is an example. (4)

20 The molecular formula ofoctane. (5)

22 A polymer used to maketubing forplumbing applications. (3)

25 The number of electrons in a

magnesium ion. (3)

26 A compound that canbe used to make up astandard solution fortitrimetric analysis byaccurate weighing.(7,8)

28 A chelating agent. (4)

31 +520 kJ per mol is anionisation energy oflithium. Is it the 1st orthe 2nd? (5)

32 A brown, crystalline,low melting element.(6)

33 0 K (8,4). (12)

Down

2 Pure substances whichcontain only one typeof atom. (8)

4 Beryllium is in thisgroup in the periodictable. (3)

5 A diatomic moleculecomprising Groups Vand VI elements. (2)

6 This applies toBakelite. (13)

7 A type of isomerismwhich is exhibited bysome alkenes. (11)

8 Standard temperature& pressure. (3)

10 An oil fractioncontainingcompounds whichhave 6 to 10 carbonatoms per molecule.(7)

11 Chemical combinationof a substance withoxygen producingheat and light. (10)

12 This results from theunequal sharing of abonding pair (as inthe HCl molecule)(4,8). (12)

13 A type of reactioninvolving thetransference ofelectrons between thereacting species. (5)

14 An intermediatestructure containing acarbon atom carryinga single positive

charge. (11)

18 Surface attraction. (10)

21 Formed when calciumfluoride is heated withconcentratedsulphuric acid. (2)

22 The iodide ion inmagnesium iodide. (9)

23 A state of matter. (5)

24 The process in whichwater becomesattached to a metalcation. (9)

27 A yellowish metal. (2)

29 Compounds used tocolour materials suchas, leather, cotton,wool, silk. (4)

30 Fuming sulphuric acid.(5)

31 The pH of 1x10-4 Mnitric acid. (4)

Xword V

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6

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11

12

13

14 15 16 17

18

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22 23

24 25 26

27 28

29 30

Across

1 This group of elementsall have colouredmolecules (5,5). (10)

5 The common oxidationstate of the halogens(5,3). (8)

7 In group four. (4)

8 Used to lower themelting point ofalumina. (8)

11 This describesphosphoric acid. (8)

12 The main commercialore of Al. (7)

13 Dissolves in dilutehydrochloric acid andin sodium hydroxidesolution givinghydrogen. (9)

14 A solution of thisforms a blood redcolour with aq iron(III). (4)

15 Very hard and can be avariety of colours. (7)

17 An important, buttoxic, fuel. (2)

18 When a solution of

silver nitrate is addedto brine thiscompound isprecipitated. (4)

21 This is particularlystrong in the case ofAl and helps preventthe metal corroding(5,4). (9)

22 This oxide of nitrogenhas 11 valencyelectrons. (2)

24 A form of sulphurstable at roomtemperature. (7)

26 The nitrogen atomsforms this structure bysharing threeelectrons and a pair ofelectrons withhydrogen. (11)

27 A region of theatmosphere. (11)

29 The smallest particle ofan element. (4)

30 Used to make plasterof Paris. (6)

Down

2 A solution of iodine inthe organic solvent,dichloromethane, hasthis colour. (6)

3 This element has theelectronic structure(Xe)6s1. (7)

4 In the treatment ofsewage, aluminiumsulphate is used forthis purpose. (9)

6 A yellow precipitateformed when iodide isused to test for lead(II) (4,6). (10)

8 Self linkage (as withcarbon). (10)

9 This gas helps preventharmful radiationreaching the earthssurface. (5)

10 Unlike carbon dioxideit does not formdiscrete molecules(7,7). (14)

14 Iodine is sparinglysoluble in water butmuch more soluble inan aqueous solution

of this salt. (2)

16 Graphite and diamond.(10)

17 The bonding inberyllium chloride.(8)

19 Applying pressure, inthe Haber process, hasthis effect on the yieldof ammonia. (8)

20 The formula of achloric acid. (4)

23 An important productderived from sand. (5)

25 Although in the samegroup, this element ismore reactive thancalcium. (6)

28 This is what happenswhen hydrogen isignited. (4)

Xword VI

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6 7

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9

10 11

12

13

14 15 16

17

18 19

20 21 22

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25

Across

2 Chlorine is one ofthese agents in itsreaction withhydrogen. (9)

6 Copper ions havinggained electrons. (7)

7 Salt maker. (7)

8 Oxidation number ofsulphur in thetetrathionate ion(3,5,4). (12)

9 This oxide convertsiron(III) oxide to ironand carbon dioxide.(2)

10 Chlorine reacts with aqthiosulphate to givehydrochloric acid andwhat else? (8)

12 Large scale productionof alkenes. (8)

13 The flame of burningcyclohexene. (6)

14 Oxidation number ofGroup I elements intheir compounds. (7)

18 Fluorine colour. (9)

19 The number of methylgroups in, 2-chloro-4-methylpentane. (5)

20 In the dehydration of10g of cyclohexanol6g of cyclohexenewas produced. Whatwas the % yield? (12)

23 Type of reaction ofchlorine with water.(5)

24 If you were to dissolvehydrated copper(II)sulphate in waterwould the temperatureincrease or decrease.(8)

25 Oxidation number of

manganese inpermanganate. (5)

Down

1 If you were to write theionic equation for thereaction of potassiumwith bromine howmany ions would theequation contain? (4)

3 A bromine molecule.(8)

4 Which of the followingis unsaturated: ethane,ethanol, propanone,benzene, ethanoicacid. (7)

5 Addition of hydrogen.(9)

11 Saturatedhydrocarbons. (7)

13 Sodium nitrate. (9)

15 Which does not

contain copper;solder, brass,duralumin, bronze?(6)

16 Calcium fluoride. (9)

17 Atoms with the samenumber of protons butdifferent numbers ofneutrons. (8)

21 In the preparation ofcyclohexene fromcyclohexanol why is itnecessary to addcalcium chloride inthe final stage? (2,3).(5)

22 Which has the largestatom, sodium oriodine? (6)

Xword VII

Xword VIII1 2 3

4 5

6 7

8 9

10

11 12

13 14 15

16

17

18 19 20

21

22

Across1 The colour of the

solution whenexcess ammonia isadded to coppersulphate solution(4,4). (8)

5 The number ofposition isomerswith the molecularformula C2H4Cl2.(3)

6 This hydroxide isdeliquescent. (4)

7 Formed when CuOis reacted withhydrogen. (6)

8 These react withchlorine in thepresence ofsunlight to formsubstitutioncompounds. (7)

11 A structural isomerof 2-methylpentane.(6)

14 Its what lead nitratedoes when heated.(12)

16 Smells of bad eggs(1,2,1)! (3)

17 A redox reactionproduces Mn(II)and Fe(III) ions.One of the reactantsis iron(II) ionsname one of theother reactsnts. (12)

21 But-2-ene has twoof these (11, 7).(18)

22 Produced whenbutan-1-ol is passedover heatedalumina (3,1,3). (7)

Down2 Like ethene, this

alkene does notform geometricalisomers. (7)

3 All soluble inwater. (8)

4 Disinfectant. (6)5 A property of these

elements is thatthey form colouredcompounds. (18)

9 Which sulphate ismost soluble inwater, calcium orbarium.(7)

10 Alkanes. (7)12 Ethyne. (9)13 This is often

observed whenethene is preparedby heating ethanolwith concentratedsulphuric acid. (8)

15 This occurs whendilute hydrochloricacid is added tosodium carbonatesolution. (12)

18 This metalproduces greenand yellowions. (4)

19 the sulphate of thismetal findsapplication inmedicinal X-raywork. (6)

20 Methylbenzene. (7)

1 2 3

4 5 6 7

8

9 10

11

12

13

14 15

16 17

18

19

20 21 22 23

24 25

26

27 28

29

Across

1 Charge on an aluminiumion (4, 5). (9)

8 A type of covalent bond.(5)

11 Twentythree grams ofsodium (3,4). (7)

12 The pi electrons in thebenzene molecule. (11)

14 A weak type of covalentbond. (2)

18 Eg, polyethene, PVC. (13)

19 A mixture ofhydrocarbons used as afuel. (6)

20 Under suitable conditionstheir molecules jointogether to form longchains. (7)

22 A type of acid, eg,ethanoic, HCN. (4)

24 The shape of the methanemolecule. (11)

26 Stimulant. (8)

27 The separation of chargedparticles in a liquid. (12)

29 The relative molecularmass of calciumcarbonate (3,7). (10)

Down

2 Dissolves in water to givesulphuric acid. (7)

3 The colour of theprecipitate when Fehlingsreagent is heated withbutanal. (7)

4 A positive result using thisreagent gives a silvermirror. (7)

5 The one having thehighest boiling point,tetrachloromethane,chloromethane ortrichloromethane? (18)

6 Heat measuring apparatus.(11)

7 The number of bonding

electrons in a phosphorusatom. (4)

9 Product from the reactionbetween, ethanol,concentrated sulphuricacid and sodiumbromide. (11)

10 The action of hotconcentrated sulphuricacid on HBr. (9)

13 Bond between the carbonatoms in ethene. (6)

14 Shape of the ammoniamolecule. (9)

15 The smell of iodoform.(10)

16 The process for makingsulphuric acid. (7)

17 The appearance or colourof phenolphthalein inacid solution. (10)

21 Butanone is an example.(6)

23 Propanal is an example.(8)

25 A bond in ammoniumchloride. (6)

28 The colour of pH paper indilute hydrochloric acid.(3)

Xword IX

1 2 3 4 5 6 7

8 9 10 11

12 13 14

15

16 17

18 19

20

21 22 23

24

25

26 27

28 29 30

31 32

33 34

35 36 37 38 39

40

Across1 Used in qualitative

inorganic analysis.(9)

3 paraffin. (6)8 A sulphate group is

an example. (5)9 CH3 (6)

10 Minus log hydrogenion concentration.(2)

11 Formed whenconcentratedsulphuric acid isheated with NaCl(3)

12 Symbol for toxic.(18)

15 One percent of theEarth's atmosphere.(2)

16 Caused by calciumcarbonate &calcium sulphate.(8)

18 The overall orderwhen, rate=[A][B] 2.(5)

19 Desirability on a parwith gold. (2)

21 A group II elementwhich forms somecovalentcompounds. (2)

22 Used to test forsulphate ion. (14)

24 The simple onesare pleasantsmelling. (5)

25 The number ofhydrogen atoms inoxalic acid. (3)

26 Used to makesulphuric acid on alarge scale. (14)

28 Responsible for thehigh boiling point

of water. (12)

33 A relativelyunreactive alkalimetal. (2)

35 The aldehydefunctional group. (3)

36 The formula of astrong mineral acid.(5)

38 A solution of iron(III) chloride. (6)

40 Used to support agas jar. (12)

Down1 A general property

of simple organiccompounds. (9)

2 The shape of themethane molecule.(11)

4 A colour observedwhen potassium isheated. (5)

5 The nature of theoxides ofaluminium andzinc. (10)

6 Suffix forcarboxylic acid. (3)

7 Wulfram. (8)11 Manufacture of

ammonia. (12)13 Shows how the

energies ofmolecules vary.(17)

14 Primary amine. (3)17 Suffix for CHO. (2)20 C4H9 group. (5)

21 Observed whentesting for calcium.(8)

23 Heat change whenanhydrous coppersulphate is added towater. (10)

27 An element whichhas a veryextensivechemistry. (6)

29 The colour offluorine gas. (6)

30 Natrium. (2)31 Formed when testing for chloride ion. (4)34 The carboxyl group.

(4)37 Suffix for RRC=O. (3)39 Present in bronze. (2)

Xword X

32 Bromine. (9)

1 2 3 4 5 6 7

8 9 10 11

12 13 14

15

16 17

18 19

20

21 22 23

24

25

26 27

28 29 30

31 32

33 34

35 36 37 38 39

40

Across1 Used in qualitative

inorganic analysis.(9)

3 paraffin. (6)8 A sulphate group is

an example. (5)9 CH3 (6)

10 Minus log hydrogenion concentration.(2)

11 Formed whenconcentratedsulphuric acid isheated with NaCl(3)

12 Symbol for toxic.(18)

15 One percent of theEarth's atmosphere.(2)

16 Caused by calciumcarbonate &calcium sulphate.(8)

18 The overall orderwhen, rate=[A][B]2. (5)

19 Desirability on a parwith gold. (2)

21 A group II elementwhich forms somecovalentcompounds. (2)

22Used to test forsulphate ion. (14)

24The simple ones arepleasant smelling.(5)

25The number ofhydrogen atoms inoxalic acid. (3)

26Used to makesulphuric acid on alarge scale. (14)

28Responsible for thehigh boiling pointof water. (12)

32Bromine. (9)33A relatively

unreactive alkalimetal. (2)

35The aldehydefunctional group.(3)

36The formula of astrong mineral acid.(5)

38 A solution of iron(III) chloride. (6)

40 Used to support agas jar. (12)

Down1 A general property

of simple organiccompounds. (9)

2 The shape of themethane molecule.(11)

4 A colour observedwhen potassium isheated. (5)

5 The nature of theoxides ofaluminium andzinc. (10)

6 Suffix forcarboxylic acid. (3)

7 Wulfram. (8)11 Manufacture of

ammonia. (12)13 Shows how the

energies ofmolecules vary.(17)

14 Primary amine. (3)17 Suffix for CHO. (2)20 C4H9 group. (5)

21 Observed whentesting for calcium.(8)

23 Heat change whenanhydrous coppersulphate is added towater. (10)

27 An element whichhas a veryextensivechemistry. (6)

29 The colour offluorine gas. (6)

30 Natrium. (2)31Formed when testing

for chloride ion. (4)34The carboxyl group.

(4)37 Suffix for RRC=O.

(3)39 Present in bronze.

(2)

Xword XI

1 2 3

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9

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12

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14

15 16 17 18 19

20

21 22

23 24 25 26

27

28

29

30 31

32

Across

1 Propanone. (8)

4 The colour expectedwhen acidifiedpotassiumdichromate isheated withethanol. (5)

7 Ethanoic acid. (7)

10 Sodium bicarbonate.(6)

11 Unbonded electronsin the ammoniamolecule. (8)

12 Methanoic acid. (5)

13 Ferric chloride. (5)

15 Percentage oxygenin methanol. (5)

20 The colour of damppH paper in sulphurdioxide gas. (3)

21 The percentagecopper inanhydrous coppersulphate. (20)

23 Sulphuric acid. (5)

24 The brown ring testfor this anion. (7)

26 The number ofhydrogen atoms inbutan-2-ol. (3)

27 The relativemolecular mass ofethanal (& carbondioxide)! (9)

28 Chloroform. (5)

29 Element relativeatomic mass 80. (7)

30 Potassiumhydrogensulphate.(5)

31 Sodium nitrate. (5)

32 In aluminiumchloride thealuminium ion hasthis effect on thehalide ions. (9)

Down

2 Calcium carbonate.(5)

3 The colour of gasevolved whencopper is added toconcentrated nitricacid. (5)

5 The formula mass ofsodiumhydrogencarbonate.(10)

6 CH3COO- (12)

8 Term applied toCH2OHCHOHCH2OH. (5)

9 Ethanamine. (7)

14 A test for this anioninvolves theaddition of dilutehydrochloric acid,observingefforvescence andtesting the evolvedgas with limewater. (9)

16 The colour of damplitmus paper inammonia gas. (4)

17 The colour of theprecipitateexpected when acarbonyl compoundis added to 2,4-DNPH reagent. (6)

18 The gas evolvedwhen sodiumnitrate is heatedstrongly. (6)

19 The relativemolecular mass ofethanol. (8)

22 Cl-35 & Cl-37. (8)

23 Phosphoric acid. (5)

25 The class of alcohol,2-methylpropan-2-ol. (8)

26 A reagent whichproduces a silvermirror withaldehydes. (7)

Xword XII

Solutions:

416

6

7

Xword I

Xword II

5a

Xword III

Xword IV

Xword VXword VI

8

First Year (or AS) Chemistry Crossword Solutions (continued):

17

Xword VII

10

Xword VIII

15

Xword IX

20

Xword X

20

Xword XI

21

Xword XII