CHEM 103
v
MODULE 6 2022
v v
Question 1 v
Not yet graded / 10 pts
v v v v v
Clickvthisv linkv tov accessv thev Periodicv Table.v Thisv mayv bev helpfulv throughoutvtheve
xam.
Listvandvexplainvifveachvofvthevfollowingvsolutionsvconductsvanvelectricvcurrent:v s
odiumvchloridev(NaCl),vhydrochloricvacidv (HCl)v andv sugarv(C 6H12O6).
Sodiumv chloridev (NaCl)v isv anv ionicv compoundv andv conductsv sincev itv formsv ionsvinvs
olution.vHydrochloricv acidv(HCl)visvavpolarvcompoundvandvconductsvsincevitvformsv i
onsvinv solution.v Sugarv (C6H12O6)v isv av molecularvcompoundv butv doesv notvformvionsvinv
solutionvsovitvdoesvnotvconduct.
Question 2 v
Not yet graded / 10 pts
v v v v v
Explainvhowvandvwhyvthevpresencevofvavsolutevaffectsvthevboilingvpointvofvavsolvent.
Thev presencevofvavsolutev raisesvthevboilingv pointvofvavsolventvbyvloweringvthevvaporvp
ressurevofvthevsolvent.v Withvthisvlowervvaporvpressure,vmorevheatv(avhighervboilingvp
oint)visvrequiredvtovraisev thev vaporvpressurevtovatmosphericvpressure.
Question 3 v
Not yet graded / 10 pts
v v v v v
Clickvthisv linkv tov accessv thev Periodicv Table.v Thisv mayv bev helpfulv throughoutvtheve
xam.
, Rankvandvexplainvhowvthevfreezingvpointvofv0.100vmvsolutionsvofvthevfollowingvion
icvelectrolytesvcompare,vListvfromvlowestvfreezingvpointvtovhighestvfreezingvpoint
.
GaCl3,vAl2(SO4)3,v NaI,v MgCl2
YourvAnswer:
Al2(SO4)3v->v2Al3+,v 3SO4v -2vvv=vv =v5vionsvv ->vmostv ionsv =vlowestv freezingvpoint
GaCl2v->vGa3+,vCl-
vvvvv
=v4vionsvMgCl2v =v3vions
NaIv=v2vionsv-v>vleastvionsv=vhighestvfreezingvpoint
GaCl3 → Ga+3 + 3vCl- ∆tfv=v1.86vxv0.1vxv4v=
3rdvlowestvFP
3vSO4
Al2(SO4)3 → 2v Al+3 + -3 ∆tfv=v1.86vxv0.1vxv5v=
lowestvFP
NaI → Na+ + I- ∆tfv=v1.86vxv0.1vxv2
=vhighestvFP
MgCl2 → Mg+2 + 2vCl- ∆tfv=v1.86vxv0.1vxv3
=v2ndvlowestvFP
FP: Al2(SO4)3vvv<v GaCl3vvv<v MgCl2vvv<v NaI
Question 4 v
Not yet graded / 10 pts
v v v v v
Clickvthisv linkv tov accessv thev Periodicv Table.v Thisv mayv bev helpfulv throughoutvtheve
xam.
Showvthev calculationv ofvthev massv percentv solutev invav solutionv ofv20.8v gramsvofv B
a(NO3)2vvvinv400v gramsv ofv water.vv Reportvyourvanswervtov 3vsignificantvfigures.
v
MODULE 6 2022
v v
Question 1 v
Not yet graded / 10 pts
v v v v v
Clickvthisv linkv tov accessv thev Periodicv Table.v Thisv mayv bev helpfulv throughoutvtheve
xam.
Listvandvexplainvifveachvofvthevfollowingvsolutionsvconductsvanvelectricvcurrent:v s
odiumvchloridev(NaCl),vhydrochloricvacidv (HCl)v andv sugarv(C 6H12O6).
Sodiumv chloridev (NaCl)v isv anv ionicv compoundv andv conductsv sincev itv formsv ionsvinvs
olution.vHydrochloricv acidv(HCl)visvavpolarvcompoundvandvconductsvsincevitvformsv i
onsvinv solution.v Sugarv (C6H12O6)v isv av molecularvcompoundv butv doesv notvformvionsvinv
solutionvsovitvdoesvnotvconduct.
Question 2 v
Not yet graded / 10 pts
v v v v v
Explainvhowvandvwhyvthevpresencevofvavsolutevaffectsvthevboilingvpointvofvavsolvent.
Thev presencevofvavsolutev raisesvthevboilingv pointvofvavsolventvbyvloweringvthevvaporvp
ressurevofvthevsolvent.v Withvthisvlowervvaporvpressure,vmorevheatv(avhighervboilingvp
oint)visvrequiredvtovraisev thev vaporvpressurevtovatmosphericvpressure.
Question 3 v
Not yet graded / 10 pts
v v v v v
Clickvthisv linkv tov accessv thev Periodicv Table.v Thisv mayv bev helpfulv throughoutvtheve
xam.
, Rankvandvexplainvhowvthevfreezingvpointvofv0.100vmvsolutionsvofvthevfollowingvion
icvelectrolytesvcompare,vListvfromvlowestvfreezingvpointvtovhighestvfreezingvpoint
.
GaCl3,vAl2(SO4)3,v NaI,v MgCl2
YourvAnswer:
Al2(SO4)3v->v2Al3+,v 3SO4v -2vvv=vv =v5vionsvv ->vmostv ionsv =vlowestv freezingvpoint
GaCl2v->vGa3+,vCl-
vvvvv
=v4vionsvMgCl2v =v3vions
NaIv=v2vionsv-v>vleastvionsv=vhighestvfreezingvpoint
GaCl3 → Ga+3 + 3vCl- ∆tfv=v1.86vxv0.1vxv4v=
3rdvlowestvFP
3vSO4
Al2(SO4)3 → 2v Al+3 + -3 ∆tfv=v1.86vxv0.1vxv5v=
lowestvFP
NaI → Na+ + I- ∆tfv=v1.86vxv0.1vxv2
=vhighestvFP
MgCl2 → Mg+2 + 2vCl- ∆tfv=v1.86vxv0.1vxv3
=v2ndvlowestvFP
FP: Al2(SO4)3vvv<v GaCl3vvv<v MgCl2vvv<v NaI
Question 4 v
Not yet graded / 10 pts
v v v v v
Clickvthisv linkv tov accessv thev Periodicv Table.v Thisv mayv bev helpfulv throughoutvtheve
xam.
Showvthev calculationv ofvthev massv percentv solutev invav solutionv ofv20.8v gramsvofv B
a(NO3)2vvvinv400v gramsv ofv water.vv Reportvyourvanswervtov 3vsignificantvfigures.
