OCR A CHEMISTRY A LEVEL PAPER 1 Questions and correct Answers

OCR A CHEMISTRY A LEVEL PAPER 1

Amountmofmsubstancemequationsm-m"ACCURATEmANSWER"mmmassm=mmrmxmmoles

molm=mvolmxmconc

vol(gas)m=mmolmxm24m(dm)

PV=nRT
(pressure,mPa,mvolume,mm3,mmoles,m-,m8.314,mtemp,mk)

Empiricalmformulam-
m"ACCURATEmANSWER"mmThemsimplestmwholemnumbermratiomofmatomsmofmeachmelement
minmamcompound

Molecularmformulam-
m"ACCURATEmANSWER"mmThemnumbermandmtypemofmatomsmofmeachmelementminmammol
ecule

Anhydrousm-m"ACCURATEmANSWER"mmContainsmnomwatermmolecules

Hydratedm-m"ACCURATEmANSWER"mmCrystallinemcompoundmcontainingmwatermmolecules

CelsiusmtomKelvinm-m"ACCURATEmANSWER"mmK=C+273

%myieldmandmatommeconomym-m"ACCURATEmANSWER"mm
%myieldm=m(actual/mtheoretical)mxm100

atommeconomym=m(desiredmproducts/allmreactants)mxm100

Cu2+minmaqmsolutionm-m"ACCURATEmANSWER"mm[Cu(H2O)6]2+
Palemblue

Fe2+minmaqmsolutionm-m"ACCURATEmANSWER"mm[Fe(H2O)6]2+
Palemgreen

Fe3+minmaqmsolutionm-m"ACCURATEmANSWER"mm[Fe(H2O)6]3+
Yellow

Mn2+minmaqmsolutionm-m"ACCURATEmANSWER"mm[Mn(H2O)6]2+
Palempink

Cr3+minmaqmsolutionm-m"ACCURATEmANSWER"mm[Cr(H2O)6]3+
Green

Cu2+mandmNaOHm(aq)m-m"ACCURATEmANSWER"mmInitially:
[Cu(OH)2(H2O)4]m(s)
Bluemprecipitate

Excess:
Nomchange

Fe2+mandmNaOHm(aq)m-m"ACCURATEmANSWER"mmInitially:
[Fe(OH)2(H2O)4]m(s)
Greenmprecipitate

, Excess:
Nomchange

Fe3+mandmNaOHm(aq)m-m"ACCURATEmANSWER"mmInitially:
[Fe(OH)3(H2O)3]m(s)
Orangemprecipitate

Excess:
Nomchange

Mn2+mandmNaOHm(aq)m-m"ACCURATEmANSWER"mmInitially:
[Mn(OH)2(H2O)4]m(s)
Pinkmprecipitate

Excess:
Nomchange

Cr3+mandmNaOHm(aq)m-m"ACCURATEmANSWER"mmInitially:
[Cr(OH)3(H2O)3]m(s)
Grey-greenmprecipitate

Excess:
[Cr(OH)6]3-m(aq)
DarkmGreen

Cu2+mandmNH3m(aq)m-m"ACCURATEmANSWER"mmInitially:
[Cu(OH)2(H2O)4]m(s)
Bluemprecipitate

Excess:
[Cu(NH3)4(H2O)2]2+m(aq)
Darkmblue

Fe2+mandmNH3m(aq)m-m"ACCURATEmANSWER"mmInitially:
[Fe(OH)2(H2O)4]m(s)
Greenmprecipitate

Excess:
Nomchange

Fe3+mandmNH3m(aq)m-m"ACCURATEmANSWER"mmInitially:
[Fe(OH)3(H2O)3]m(s)
Orangemprecipitate

Excess:
Nomchange

Mn2+mandmNH3m(aq)m-m"ACCURATEmANSWER"mmInitially:
[Mn(OH)2(H2O)4]m(s)
Pinkmprecipitate

Excess:
Nomchange

Cr3+mandmNH3m(aq)m-m"ACCURATEmANSWER"mmInitially:
[Cr(OH)3(H2O)3]m(s)