Chemical Changes Lab
Name: Marisa Malazzo
Date: 7/17/14
Exp 1: Observations of Chemical Changes
Lab Section: 76426
Data Tables:
Part 1:
Chemicals
Well No.
Observations of the Reaction
A.
NaHCO3 + HCl
no color change, some small bubbles formed
B.
HCl + BTB
changed a yellowish orange color, no bubbles or precipitation
C.
NH3 + BTB
changed a blue color
D.
HCl + blue dye
changed a green color
E.
Blue dye + NaOCl
no chemical change, only blue color appeared
with the 1 drop of HCl
blue green then changed to yellow
F.
NaOCl + KI
turned blackish brown
with 1 drop of starch
turned black then back to yellowish brown
G.
KI + Pb(NO3)2
bright yellow and almost like it had pulp consistency to it …show more content…
After completing this experiment several of the chemicals just simply changed colors. The main colors shown were blue, yellow, pink, green, and a brownish black. A few of the reactants did not change to a different color at all, but did show little signs of bubbles at the surface.
The household items had similar reactions as the chemicals provided in the kit as far as color changes and slight physical precipitation. I attempted to be sure and drop the same number of drops in the beaker when testing the reactions to reduce the percent error throughout the experiment. I do believe the goal of this experiment was achieved because I did learn how to decipher between acids and bases as far as the color change during the reactions.
The experiment was very helpful in learning how the chemicals do react with each other. Some chemicals change colors, some chemicals remain the same color, but bubble or precipitate, while others might no have any apparent physical change at all. All chemicals react differently to each other in different situations, lighting, temperatures and surroundings. Learning about these different chemicals was very intriguing to me and a fun experiment to do as
Date: 7/17/14
Exp 1: Observations of Chemical Changes
Lab Section: 76426
Data Tables:
Part 1:
Chemicals
Well No.
Observations of the Reaction
A.
NaHCO3 + HCl
no color change, some small bubbles formed
B.
HCl + BTB
changed a yellowish orange color, no bubbles or precipitation
C.
NH3 + BTB
changed a blue color
D.
HCl + blue dye
changed a green color
E.
Blue dye + NaOCl
no chemical change, only blue color appeared
with the 1 drop of HCl
blue green then changed to yellow
F.
NaOCl + KI
turned blackish brown
with 1 drop of starch
turned black then back to yellowish brown
G.
KI + Pb(NO3)2
bright yellow and almost like it had pulp consistency to it …show more content…
After completing this experiment several of the chemicals just simply changed colors. The main colors shown were blue, yellow, pink, green, and a brownish black. A few of the reactants did not change to a different color at all, but did show little signs of bubbles at the surface.
The household items had similar reactions as the chemicals provided in the kit as far as color changes and slight physical precipitation. I attempted to be sure and drop the same number of drops in the beaker when testing the reactions to reduce the percent error throughout the experiment. I do believe the goal of this experiment was achieved because I did learn how to decipher between acids and bases as far as the color change during the reactions.
The experiment was very helpful in learning how the chemicals do react with each other. Some chemicals change colors, some chemicals remain the same color, but bubble or precipitate, while others might no have any apparent physical change at all. All chemicals react differently to each other in different situations, lighting, temperatures and surroundings. Learning about these different chemicals was very intriguing to me and a fun experiment to do as