Dr Davids as Crossword Puzzles Solutions BkIV

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Text of Dr Davids as Crossword Puzzles Solutions BkIV

  • 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

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    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

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    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

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    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

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    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

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    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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