Observations of Chemical Changes
Data Tables:
Part 1:
Chemicals
Well No.
Observations of the Reaction
A.
NaHCO3 + HCl
1A
Bubbles appeared for 5 seconds. Now clear in color, no bubbles
B.
HCl + BTB
2A
Turned from clear to yellow
C.
NH3 + BTB
3A
Turned from clear to dark blue
D.
HCl + blue dye
4A
Turned from clear to green
E.
Blue dye + NaOCl
5A
Turned from blue to light blue
with the 1 drop of HCl
6A
Turned from blue->light blue->yellow->light yellow->clear, transparent
F.
NaOCl + KI
7A
Turned from clear to Light yellow
with 1 drop of starch
8A
Then turned to dark brown
G.
KI + Pb(NO3)2
9A
Turned from clear to opaque yellow
H.
NaOH + phenolphthalein
10A
Turned from clear to rose color
I.
HCl + phenolphthalein
11A
No color change, clear and transparent
J.
NaOH + AgNO3
12A
Turned from clear to translucent light gray
K.
AgNO3 + NH3
1B
Many tiny particles forming on the bottom for 3 minutes, then disappeared
after exposure to bright light
L.
NH3 and CuSO4
2B
Turned from clear to opaque light blue
Part F: Testing of Various Foods with the NaOCl + KI solution
Foods
Presence or Absence of Starch
A piece of bread
Spot turned dark, starch presents
Blue berry
Spot did not turn, starch is absent
Girl scout cookie
Spot turned dark, starch presents
Pistachio
Spot turned dark, starch presents
Green bean
Spot did not turn, starch is absent
Part 2:
Household Chemicals with Bromthymol Blue
Use the empty pipet in the Auxiliary Supplies Bag to test several (at least 3) household items including household cleaning products with bromothymol blue. Rinse the pipet well before using it on the next household chemical. When finished with this experiment rinse the pipet well and return it to the Auxiliary Bag for use in future experiments. Name the items tested and record their results.
Household Chemicals
Well No.
Observations of the Reaction
Hand soap
1C
Liquid quickly turned green
Windex
2C
Liquid quickly turned yellow
Disinfecting wipes
3C
Liquid quickly turned yellow
Part 1:
Chemicals
Well No.
Observations of the Reaction
A.
NaHCO3 + HCl
1A
Bubbles appeared for 5 seconds. Now clear in color, no bubbles
B.
HCl + BTB
2A
Turned from clear to yellow
C.
NH3 + BTB
3A
Turned from clear to dark blue
D.
HCl + blue dye
4A
Turned from clear to green
E.
Blue dye + NaOCl
5A
Turned from blue to light blue
with the 1 drop of HCl
6A
Turned from blue->light blue->yellow->light yellow->clear, transparent
F.
NaOCl + KI
7A
Turned from clear to Light yellow
with 1 drop of starch
8A
Then turned to dark brown
G.
KI + Pb(NO3)2
9A
Turned from clear to opaque yellow
H.
NaOH + phenolphthalein
10A
Turned from clear to rose color
I.
HCl + phenolphthalein
11A
No color change, clear and transparent
J.
NaOH + AgNO3
12A
Turned from clear to translucent light gray
K.
AgNO3 + NH3
1B
Many tiny particles forming on the bottom for 3 minutes, then disappeared
after exposure to bright light
L.
NH3 and CuSO4
2B
Turned from clear to opaque light blue
Part F: Testing of Various Foods with the NaOCl + KI solution
Foods
Presence or Absence of Starch
A piece of bread
Spot turned dark, starch presents
Blue berry
Spot did not turn, starch is absent
Girl scout cookie
Spot turned dark, starch presents
Pistachio
Spot turned dark, starch presents
Green bean
Spot did not turn, starch is absent
Part 2:
Household Chemicals with Bromthymol Blue
Use the empty pipet in the Auxiliary Supplies Bag to test several (at least 3) household items including household cleaning products with bromothymol blue. Rinse the pipet well before using it on the next household chemical. When finished with this experiment rinse the pipet well and return it to the Auxiliary Bag for use in future experiments. Name the items tested and record their results.
Household Chemicals
Well No.
Observations of the Reaction
Hand soap
1C
Liquid quickly turned green
Windex
2C
Liquid quickly turned yellow
Disinfecting wipes
3C
Liquid quickly turned yellow