OCR A LEVEL PAPER 1 MULTIPLE CHOICE

OCR A LEVEL PAPER 1 MULTIPLE CHOICE

Cr2(SO4)3(aq)mandmBaCl2(aq)mformsmwhatmcolourmprecipitate?m-
m"ACCURATEmANSWER"mmwhite

WhatmismthemDeltamHmequationmformbondmenthalpies?m-
m"ACCURATEmANSWER"mmBondsmBrokenm(reactants)m-mBondmMadem(products)

Whatmdoesmamzeromordermconcentration-timemgraphmlookmlike?m-
m"ACCURATEmANSWER"mmStraightmlinemwithmnegativemgradient

Whatmhappensmtomthemmassmofmthempositivemelectrode?m-
m"ACCURATEmANSWER"mmIncreases

WhatmismthemelectronmconfigurationmofmamCumatom?m-
m"ACCURATEmANSWER"mmCumatom:m1s22s22p63s23p63d104s1

WhatmismthemelectronmconfigurationmofmamCrmatom?m-
m"ACCURATEmANSWER"mmCrmatom:m1s22s22p63s23p63d54s1

Howmdomyoumfindmthemnumbermofmatomsmofmamgivenmelementminmamcompoundmwhenm
givenmmolesmofmthemcompound?m-
m"ACCURATEmANSWER"mm1.mMultiplymmolesmbymAvogadrosm
2.mMultiplymanswermbymthemnumbermofmatomsmofmthemelementmpresentminmthemcompou
nd

Howmdomyoumexplainmwhymnitrogenmhasmamlargermfirstmionisationmenergymthanmoxygen?
m-m"ACCURATEmANSWER"mmNmatomsmhavemlessmrepulsionmbetweenmp-
orbitalmelectronsmthanmOmatoms

Whatmdoesmamfirstmordermrate-concentrationmgraphmlookmlike?m-
m"ACCURATEmANSWER"mmStraightmlinemthroughmthemorigin

Whatmismthemequationmofmentropymchange?m-
m"ACCURATEmANSWER"mmDeltamSm=mentropymsummproductsm-mentropymsummreactants

Whichmenthalpymchange(s)mis/aremendothermic?
1mThembondmenthalpymofmthemC-Hmbond
2mThemsecondmelectronmaffinitymofmoxygen
3mThemstandardmenthalpymchangemofmformationmofmmagnesiumm-
m"ACCURATEmANSWER"mmOnlym1mandm2

Howmdomyoumexplainmwhymreactionmratesmincreasemasmtemperaturemincreases?m-
m"ACCURATEmANSWER"mmCollisionsmbetweenmmoleculesmaremmoremfrequent.
Andmamgreatermproportionmofmmoleculesmhavemenergymgreatermthanmthemactivationmenerg
y

Aremhalogensmoxidisingmormreducingmagents?m-m"ACCURATEmANSWER"mmoxidisingmagents

Whichmsetmofmelementsminmthemsolidmstatemcontainmamsimplemmolecularmlattice,mamgiant
mcovalentmlattice
andmamgiantmmetallicmlattice?
AmS,mSi,mAl
BmP,mSi,mC
CmS,mP,mSi