Reactions Lab Final
1 Semester Lab Final January 21rd, 2009
st
Name(s): ______________________ ___________________
period: ______
Packet # _________ Station # _________Goggles always on ________ Cleaned up: ______
(Pipette cleanup will be counted the next day, rinse each pipette 3 times with clean RUNNING water)
Your packet contains 12 of the following 18 compounds (look at tag on bag, do not destroy tag).
Identify them by their physical properties and how they interact (or fail to interact) with each
other. You must tell me which compound is in each numbered pipette and offer at least one valid
reason for your answer. You will get more partial credit if you are wrong but offer additional
valid reasons. You will not be given any refills.
You may use the data chart you produced in practice as well as the list of names and physical
descriptions that you prepared.
Possible compounds in your packet:
HCl, H2SO4, NaOH, NH4OH, K2CO3, Na2CrO4, Al2(SO4)3, Ba(NO3)2, CaCl2
CoCl2, CuSO4, FeSO4, FeCl3, NiSO4, AgNO3, Zn(NO3)2, MgCl2, K4Fe(CN)6
Suggested plan of attack: (you don’t have to use this it’s just a suggestion)
1)
2)
3)
4)
5)
6)
7)
Try to identify any that you can by color (get an idea)
Find the Ammonium Hydroxide (by smell)
Find the HCl by seeing the smoke ( put the stinky stuff down first)
Find the Potassium Carbonate (it makes bubbles with the HCl)
Find the H2SO4 (it also bubbles with the carbonate)
Identify the NaOH by how it reacts with any of the colored ones you identified.
Now that you have several identified use your knowledge and chart to determine the rest.
Good Luck (you won’t need it if you are well prepared and stay calm)
Pipette #1 contains __________________________________________
(give both name and formula)
Reasons: ____________________________________________________
____________________________________________________
____________________________________________________
Pipette #2 contains __________________________________________
(give both name and formula)
Reasons: ____________________________________________________
____________________________________________________
____________________________________________________
Pipette #3 contains __________________________________________
(give both name and formula)
Reasons: ____________________________________________________
____________________________________________________
____________________________________________________
Pipette #4 contains __________________________________________
(give both name and formula)
Reasons: ____________________________________________________
____________________________________________________
____________________________________________________
Pipette #5 contains __________________________________________
(give both name and formula)
Reasons: ____________________________________________________
____________________________________________________
____________________________________________________
Pipette #6 contains __________________________________________
(give both name and formula)
Reasons: ____________________________________________________
____________________________________________________
____________________________________________________
Pipette #7 contains __________________________________________
(give both name and formula)
Reasons: ____________________________________________________
____________________________________________________
____________________________________________________
Pipette #8 contains __________________________________________
(give both name and formula)
Reasons: ____________________________________________________
____________________________________________________
____________________________________________________
Pipette #9 contains __________________________________________
(give both name and formula)
Reasons: ____________________________________________________
____________________________________________________
____________________________________________________
Pipette #10 contains __________________________________________
(give both name and formula)
Reasons: ____________________________________________________
____________________________________________________
____________________________________________________
Pipette #11 contains __________________________________________
(give both name and formula)
Reasons: ____________________________________________________
____________________________________________________
____________________________________________________
Pipette #12 contains __________________________________________
(give both name and formula)
Reasons: ____________________________________________________
____________________________________________________
____________________________________________________
Reactions Lab Final
1 Semester Lab Final Suggested plan(s) of attack
st
YOU MUST HAVE A CLEAR ORGANIZED DATA CHART, KNOW YOUR REACTIONS!!
Your packet contains 12 of the following 18 compounds (look at tag on bag, do not destroy tag).
Identify them by their physical properties and how they interact (or fail to interact) with each
other. You must tell me which compound is in each numbered pipette and offer at least one valid
reason for your answer. You will get more partial credit if you are wrong but offer additional
valid reasons. You will not be given any refills (remember each pipette holds over 60 drops).
You NEED the data chart you produced in practice you may also use the list of names and
physical descriptions that you prepared.
Possible compounds in your packet: (every one gets the first 5 somewhere in their packet)
HCl, H2SO4, NaOH, NH 4OH, K2CO3, Na2CrO4, Al2(SO4)3, Ba(NO3)2,
CaCl2, CoCl2, CuSO4, FeSO4, FeCl3, NiSO4, AgNO3, Zn(NO3)2, MgCl2, K4Fe(CN)6
Suggested plan of attack: (USE A PENCIL SO YOU CAN CHANGE YOUR MIND IF IT
DOSENT SEEM TO BE WORKING OUT)
8) Try to identify any that you can by color (get an idea)
9) Find the Ammonium Hydroxide (by smell)
10) Find the HCL by seeing the smoke ( put the stinky stuff down first) not everyone can see
this, it’s hard
11) Find the Potassium Carbonate (it makes bubbles with the HCl)
12) Find the H2SO4 (it also bubbles with the carbonate)
13) Identify the NaOH by how it reacts with any of the colored ones you identified.
14) Now that you have several identified use your knowledge and chart to determine the rest.
Align the ones that you know alongside the chart or somehow organize them. And use
their reactions with your unknowns to identify the rest. (DON’T be so locked onto Wrong
assumptions that you won’t change, you may have incorrectly identified one, also use
your knowledge and the chart to predict/identify/eliminate choices. Remember you know
which 12 you have you just have to figure out which pipette they are in)
Example 1: # 7 bubbles with # 4; # 4 bubbles with #9.
What must #4 be?
What are your two choices for # 7 and #9 ?
Example 2:
#3 stinks and makes the #1 (which looks pink) turn bluish. # 11 also
makes the pink stuff turn bluish.
What is in #3
What is in #1
What is in #11
Example 3:
#5 is yellowish What might it be?
When #5 is
mixed with another yellowish one (#2) it turns very bluish black, but when #5 is mixed with
the smelly one it turns a runny yellow(more of a cloudy brown) What are in #5 and #2?
Good Luck (you won’t need it if you are well prepared)
(#1 = CoCl2, #2 = K4Fe(CN)6, #3 = NH 4OH, #4= K2CO3, #5= FeSO4, #7= an acid
#9= an acid; you can determine which acid (HCL or H2SO4) by other reactions)