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IGCSE Chemistry Definitions Questions And Answers

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IGCSE Chemistry Definitions Questions And Answers IGCSE Chemistry Definitions Questions And Answers IGCSE Chemistry Definitions Questions And Answers

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IGCSE Chemistry Definitions Questions
And Answers

Acidd-dCORRECTddANSWER-
TheydhavedadpHdlessdthand7danddneutralizedbasesdordalkalisdtodformdsaltdanddwater.dAciditydi
sdcauseddbydadhighdconcentrationdofdhydrogendions

AdditiondPolymerizationd-dCORRECTddANSWER-
Adreactiondwheredmanydsmalldalkenedmoleculesd(monomers)djoindupdtodformdadlongdchaind
moleculedofdrepeatingdunitsd(polymer)

Alkalid-dCORRECTddANSWER-TheydhavedadpHdgreaterdthand7danddneutralizedacidsdto
formdsaltdanddwater.dTheydhavedadhighdconcentrationdofdhydroxyldionsd(OH-
).dTheydaredsolubledbases

Alkaned-dCORRECTddANSWER-Adsaturateddhydrocarbonde.g.dCH4d-dmethane

Alkened-dCORRECTddANSWER-Andunsaturateddhydrocarbonde.g.dC2H4d-dethene

Aniond-dCORRECTddANSWER-Negativediond(attracteddtodthedanode)

Anoded-dCORRECTddANSWER-Thedpositivedterminald(electrode)

Atomd-dCORRECTddANSWER-
Thedsmallestdunitdofdandelement,dhavingdalldthedcharacteristicsdofdthatdelement

Atomicdnumber/Protondnumberd-dCORRECTddANSWER-
Thednumberdofdprotonsdindandatom

Based-dCORRECTddANSWER-
AdsubstancedwithdadpHdhigherdthand7,dtheydreactdwithdacidsdtodformdadsaltdanddwaterd(called
dneutralization).dMetaldhydroxides,doxidesdanddcarbonatesdaredalldbases




BoilingdPointd-dCORRECTddANSWER-
Temperaturedatdwhichdadliquiddchangesdintodadvapourdatdatmosphericdpressure

, Catalystd-dCORRECTddANSWER-
Substancedwhichdincreasesdthedratedofdreactiondwithoutdchemicallydbeingdchanged.dItdlowe
rsdthedactivationdenergydofdthedreaction

Cathoded-dCORRECTddANSWER-Thednegativedterminald(electrode)

Cationd-dCORRECTddANSWER-Positivediond(metal)dattracteddtodthedcathode

Combustiond-dCORRECTddANSWER-
Adreactiondwheredadsubstancedburnsdindoxygendcombiningdtodformdthedoxidedanddgivingdout
denergy




Compoundd-dCORRECTddANSWER-
Madedofdtwodordmoreddifferentdatomsdchemicallydjoineddtogether

Condensationd-dCORRECTddANSWER-Gas/vapourdchangingdintodadliquid

CondensationdPolymerizationd-dCORRECTddANSWER-
Adreactiondwhereddifferentdmonomersdjoindupdtodformdadlongdchaindmoleculedofdrepeatingdu
nitsd(polymer)dwhilstdalsodproducingdsmallerdmolecules

CovalentdBondingd-dCORRECTddANSWER-
Adverydstrongdelectrostaticdforcedofdattractiondbetweendshareddpairsdofdbondingdelectronsda
nddthednucleidofdtheirdatoms

Crackingd-dCORRECTddANSWER-
Processdwheredlongdchaindhydrocarbonsdofdlittledvaluedaredbrokenddowndbydheatdanddadcat
alystdintodsmaller,dmoredusefuldhydrocarbons

CrudedOild-dCORRECTddANSWER-
Admixturedofdhydrocarbonsdformeddfromdthedremainsdofddeaddseadlifedwhichdwasdcovereddw
ithdsiltdondthedseadbeddanddcompresseddoverdmillionsdofdyears

Diffusiond-dCORRECTddANSWER-
Thedrandomdmovementdofdparticlesdfromdandareadofdadhighdconcentrationdtodandareadofdlowd
concentration

Displacementd-dCORRECTddANSWER-
Adreactiondwheredadmoredreactivedelementddisplacesdadlessdreactivedelementdfromdadsoluti
ondofditsdcompound

Dynamicdequilibriumd-dCORRECTddANSWER-
Thedstatedofdadreversibledreactiondwhendthedratedofdthedforwarddreactiondisdequaldtodthedrate
dofdthedbackwarddreaction

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