OCR A A Level CHEMISTRY PAPER 1
Testmformcarbonatesm-m"ACCURATEmANSWER"mm-maddmdilutemHCL
-mitmmakesmcarbonmdioxidem
testmformcarbonmdioxidembymbubblingmitmthroughmlimemwater
Testmformammoniummionsm-m"ACCURATEmANSWER"mm-addmsodiummhydroxidem
-warmmthemmixturem
-hovermdampmredmlitmusmpapermovermitm,mifmitmturnsmbluemthemionsmarempresent
Testmformsulphatemionzm(SO4m2-)m-m"ACCURATEmANSWER"mm-maddmdilutemHCL
-mthenmaddmBaCl2
-mBaSO4mismmademwhichmisminsolubleminmwatermsomamwhitemprecipitatemwillmbemformed
TestmformHalidesm(Cl-,mBr-,mI-)m-m"ACCURATEmANSWER"mm-maddmnitricmacidm
-maddmsilvermnitratem
-mprecipitatesmwillmbemformedm
-mClm(white)m,mBrm(cream)m,mIm(yellow)
Whymaddmdilutemacidsmwhenmtestingmformionsm?m-
m"ACCURATEmANSWER"mmitmwillmgetmridmofmanymlurkingmanionsmthatmmaymcreatemfalse
mpositives
Endothermicmenergymprofilemdiagramm-
m"ACCURATEmANSWER"mmproductsmaremhighermthanmreactants
Exothermicmenergymprofilemdiagramm-
m"ACCURATEmANSWER"mmreactantsmaremhighermthanmproducts
Whatmaremstandardmconditions?m-m"ACCURATEmANSWER"mm298Kmandm100kPa
Enthalpymchangemofmreactionm-
m"ACCURATEmANSWER"mmthementhalpymchangemwhenmthemreactionmoccursminmmolarmqua
ntitiesmshownminmthemchemicalmequationmundermstandardmconditions
Enthalpymchangemofmformationm-
m"ACCURATEmANSWER"mmthementhalpymchangemwhenm1mmolemofmcompoundmismformedm
frommit'smelementsminmtheirmstandardmstatesmundermstandardmconditions
Enthalpymchangemofmcombustionm-
m"ACCURATEmANSWER"mmthementhalpymchangemwhenm1mmolemofmamsubstancemismburne
dmcompletelyminmoxygenmundermstandardmconditions
Enthalpymchangemofmneutralisationm-
m"ACCURATEmANSWER"mmthementhalpymchangemwhenmanmacidmandmalkalimreactmunderms
tandardmconditionsmtomformm1mmolemofmwater
Bondmdissociationmenthalpym-
m"ACCURATEmANSWER"mmThementhalpymchangemrequiredmtombreakmamcovalentmbondmwit
hmallmspeciesminmthemgaseousmstate
howmtomfindmoutmenthalpymchangemofmcombustionminmthemlabm-
m"ACCURATEmANSWER"mm-mburnmthemfuelm
-mallowmitmtomheatmthemwaterm
-workmoutmthemchangeminmtemperaturemofmthemwater
Testmformcarbonatesm-m"ACCURATEmANSWER"mm-maddmdilutemHCL
-mitmmakesmcarbonmdioxidem
testmformcarbonmdioxidembymbubblingmitmthroughmlimemwater
Testmformammoniummionsm-m"ACCURATEmANSWER"mm-addmsodiummhydroxidem
-warmmthemmixturem
-hovermdampmredmlitmusmpapermovermitm,mifmitmturnsmbluemthemionsmarempresent
Testmformsulphatemionzm(SO4m2-)m-m"ACCURATEmANSWER"mm-maddmdilutemHCL
-mthenmaddmBaCl2
-mBaSO4mismmademwhichmisminsolubleminmwatermsomamwhitemprecipitatemwillmbemformed
TestmformHalidesm(Cl-,mBr-,mI-)m-m"ACCURATEmANSWER"mm-maddmnitricmacidm
-maddmsilvermnitratem
-mprecipitatesmwillmbemformedm
-mClm(white)m,mBrm(cream)m,mIm(yellow)
Whymaddmdilutemacidsmwhenmtestingmformionsm?m-
m"ACCURATEmANSWER"mmitmwillmgetmridmofmanymlurkingmanionsmthatmmaymcreatemfalse
mpositives
Endothermicmenergymprofilemdiagramm-
m"ACCURATEmANSWER"mmproductsmaremhighermthanmreactants
Exothermicmenergymprofilemdiagramm-
m"ACCURATEmANSWER"mmreactantsmaremhighermthanmproducts
Whatmaremstandardmconditions?m-m"ACCURATEmANSWER"mm298Kmandm100kPa
Enthalpymchangemofmreactionm-
m"ACCURATEmANSWER"mmthementhalpymchangemwhenmthemreactionmoccursminmmolarmqua
ntitiesmshownminmthemchemicalmequationmundermstandardmconditions
Enthalpymchangemofmformationm-
m"ACCURATEmANSWER"mmthementhalpymchangemwhenm1mmolemofmcompoundmismformedm
frommit'smelementsminmtheirmstandardmstatesmundermstandardmconditions
Enthalpymchangemofmcombustionm-
m"ACCURATEmANSWER"mmthementhalpymchangemwhenm1mmolemofmamsubstancemismburne
dmcompletelyminmoxygenmundermstandardmconditions
Enthalpymchangemofmneutralisationm-
m"ACCURATEmANSWER"mmthementhalpymchangemwhenmanmacidmandmalkalimreactmunderms
tandardmconditionsmtomformm1mmolemofmwater
Bondmdissociationmenthalpym-
m"ACCURATEmANSWER"mmThementhalpymchangemrequiredmtombreakmamcovalentmbondmwit
hmallmspeciesminmthemgaseousmstate
howmtomfindmoutmenthalpymchangemofmcombustionminmthemlabm-
m"ACCURATEmANSWER"mm-mburnmthemfuelm
-mallowmitmtomheatmthemwaterm
-workmoutmthemchangeminmtemperaturemofmthemwater
