AQA A Level Chemistry Definitions questions and answers latest top score.

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AQA A Level Chemistry Definitions
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questions and answers latest top score.
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Relative xAtomic xMass x- x x x x x xANS.The xweighted xmean xmass xof xan xatom xof xan
xelement x
x
relative xto x1/12 xof xthe xmass xof xone xatom xof xcarbon-
12
x

First xIonisation xenergy x- x x x x x xANS.The xenergy xrequired xto xremove xan xelectron xfrom
xeach x
x
atom xin xone xmole xof xgaseous
xatoms
x

Acid x- x x x x x xANS.A xspecies xthat xis xa xproton xdonor x
x

Activation xEnergy x- x x x x x xANS.The xminimum xenergy xrequired xto xstart xa xreaction
xby xthe x
x
breaking xof

xbonds
x

Addition xPolymer x- x x x x x xANS.The xprocess xin xwhich xunsaturated xalkene xmolecules
xass xon xto xa xgrowing xpolymer xchain xone xat xa xtime xto xform xa xvery xlong xsaturated

xmolecule xchain x
x

Addition xReaction x- x x x x x x ANS.A xreaction xin xwhich xa xreactant xis xadded xto xan
xunsaturated x
x
molecule xto xmake x a x saturated
xmolecule
x

Adsorption x- x x x x x xANS.The xprocess xthat xoccurs xwhen xa xgas, xliquid xor xsolid xis xheld
xto xthe x
x
surface xof xa xsolid, xor, xmore xrarely, xa
xliquid
x

Alicyclic xHydrocarbon x- x x x x x xANS.A xhydrocarbon xwith xcarbon xatoms xjoined xtogether
xin xa x
x
ring
xstructure
x

, Aliphatic xHydrocarbon x- x x x x x x ANS.A xhydrocarbon xwith xcarbon xatoms xjoined
xtogether xin x
x
straight xor xbranched

xchains
x

Alkali x- x x x x x xANS.A xtype xof xbase xthat xdissolves xin xwater xforming xhydroxide xions x
x

Alkanes x- x x x x x xANS.The xhomologous xseries xwith xthe xgeneral xformula xCnH2n+2 x
x

Alkyl xGroup x- x x x x x xANS.An xalkane xwith xa xhydrogen xion xremoved. xAlkyl xgroups xare
xoften x
x
shown xas
x'R'
x

Amount xof xSubstance x- x x x x x xANS.The xquantity xwhose xunit xis xthe xmole x
x

Anhydrous x- x x x x x xANS.A xsubstance xcontaining xno xwater xmolecules x
x

Anion x- x x x x x xANS.A xnegatively xcharged xion x
x

Atom xEconomy x- x x x x x xANS.(molecular xmass xof xthe xdesired xproduct/sum xof
xmolecular x
x
masses xof xall xproducts)
xx100
x

Atomic xOrbital x- x x x x x xANS.A xregion xwithin xan xatom xthat xcan xhold xup xto xtwo xelectrons,
xwith x
x
opposite
xspins
x

Atomic xNumber x- x x x x x xANS.The xnumber xof xprotons xin xthe xnucleus xof xan xatom x
x

Average xBond xEnthalpy x- x x x x x xANS.The xaverage xenthalpy xchange xthat xtakes xplace
xwhen x
x
breaking xby xhomolytic xfission x1 xmol xof xa xgiven xtype xof xbond xin xthe xmolecules
xof xa
x
gaseous
xsubstance
x

Avogadro xConstant x- x x x x x x ANS.The xnumber xof xatoms xper xmole xof xthe xcarbon-12
xisotope. x
x
(6.02 xx

x10^23)
x

Base x- x x x x x xANS.A xspecies xthat xis xa xproton xacceptor x
x

Biodegradable xMaterial x- x x x x x xANS.A xsubstance xthat xis xbroken xdown xnaturally
xin xthe x