Smooth Operater

don't bug "operatEr"!
10+ Year Member
5+ Year Member
May 22, 2004
1,285
1
Status
Hello guys!

One of Kaplan subject exam questions say the 2nd reaction (b) will not proceed. How come? I though it is a single displacment rxn. Can anyone explain this? Thanks!

A. 2 Li + CuCl2 → 2 LiCl + Cu
B. Zn + NaNO3 → no reaction
C. CaCO3 + 2 HCl → CaCl2 + H2CO3 → CaCl2 + CO2 + H2O
D. 2 K + 2 H2O → 2 KOH + H2
E. H+ + OH- → H2O
 

DDS:)

Senior Member
10+ Year Member
5+ Year Member
Apr 8, 2005
452
0
Status
Dental Student
I cant remember the reaction series top of my head right now, but check into ur Gchem text book it has a table tells u which one are more reactive than the other.

For this particular question, Na is more reactive than Zn, so this rxn doesnt occur.
 

cocokeala

katonk!
10+ Year Member
5+ Year Member
May 30, 2006
118
0
33
california
Status
Dental Student
A. 2 Li + CuCl2 → 2 LiCl + Cu
B. Zn + NaNO3 → no reaction
C. CaCO3 + 2 HCl → CaCl2 + H2CO3 → CaCl2 + CO2 + H2O
D. 2 K + 2 H2O → 2 KOH + H2
E. H+ + OH- → H2O

heh so my sister explained it to me like this cuz she just finished highschool chem so its fresh in her head and shes cute.

NANO3 are dancing together...and Zn wants to cut in. but Na has a higher priority than Zn, so Zn cannot cut in and NaNO3 keeps dancing the night away.

Li is the highest on the activity series so it can cut in on CuCl2

Ca wants to cut in on HCL and Ca is higher on the activity series so it can cut in

K is second highest on the activity series so it will cut in on H again

i like to remember that H is somewhere kinda in the middle of the series.

okay well hope that helps if it is at all correct in real chem terms.


so ya you just gotta look at the activity series.
 
About the Ads
OP
S

Smooth Operater

don't bug "operatEr"!
10+ Year Member
5+ Year Member
May 22, 2004
1,285
1
Status
k, that makes sense. I notice kaplan doesn't show any metal activity trend. I don't have my chem text now. I am just relying on internet and kaplan book.
I found a activity trend table at http://www.unr.edu/sb204/geology/mas.html.

but is there actually a trend that I help me memorize the activity series? Thanks! :)
 
About the Ads