CHM130 Lab 3
CHM130
Lab 3
Identification of Chemical Change
Name: Paige Miller
A. Data Table (24 points)
Place your completed data table here:
Reactants
Predictions Before
Combining
Observations After
Combining
Starch + I2 I2 will turn Starch black I2 turned starch black
Food coloring + NaOCl NaOCI will turn blue Coloring and NaOCI did not combine, NaOCI separated to the bottom
Food coloring + CH3COOH CH3COOH will turn blue CH3COOH darkened the blue color
Food coloring + NaOCl
+ CH3COOH Will remain seperate Solutions returned to clear/cloudy, clear
Red cabbage + NH3 Change to clear Turned green
Red cabbage + CH3COOH Change to clear Turned pink
NaHCO3 + NH3 Will mix Backing soda separated to the bottom
NaHCO3 + CH3COOH Will create bubbles Bubbled over
Na2CO3 + CH3COOH Bubble Small fizz, clouded the mixture
MgSO4 + CH3COOH Fizz Nothing
MgSO4 + NH3 Mix NH3 turned the MgSO4 white
MgSO4 + Na2CO3 Fizz or cloud The two combined and thickened
B. Follow-Up Questions
1. What type of macroscopic evidence for chemical change did you observe during this experiment? Give at least three different examples. (15 points)
- The food coloring + CH3COOH darkening in color, food coloring + NaOCI + CH3COOH returning to clear, red cabbage + NH3 turning green, red cabbage + CH3COOH turning pink, NaHCO3 + CH3COOH bubbling over, Na2CO3 + CH3COOH fizzing and turning cloudy, MgSO4 + NH3 turning white, and the MgSO4 + Na2CO3 becoming thick are all examples of macroscopic evidence for chemical change.
2. Which reactions, if any, do you believe showed no evidence of chemical change? Justify your reasoning. (15 points)
- I believe the food coloring + NaOCI show no evidence of chemical change because they would not combine. I think that the properties of bleach that allow it to remove stains (color) from things are the same properties that disallow them to combine and have a reaction or change.
3. When two solutions combine and a solid substance is formed, this
Lab 3
Identification of Chemical Change
Name: Paige Miller
A. Data Table (24 points)
Place your completed data table here:
Reactants
Predictions Before
Combining
Observations After
Combining
Starch + I2 I2 will turn Starch black I2 turned starch black
Food coloring + NaOCl NaOCI will turn blue Coloring and NaOCI did not combine, NaOCI separated to the bottom
Food coloring + CH3COOH CH3COOH will turn blue CH3COOH darkened the blue color
Food coloring + NaOCl
+ CH3COOH Will remain seperate Solutions returned to clear/cloudy, clear
Red cabbage + NH3 Change to clear Turned green
Red cabbage + CH3COOH Change to clear Turned pink
NaHCO3 + NH3 Will mix Backing soda separated to the bottom
NaHCO3 + CH3COOH Will create bubbles Bubbled over
Na2CO3 + CH3COOH Bubble Small fizz, clouded the mixture
MgSO4 + CH3COOH Fizz Nothing
MgSO4 + NH3 Mix NH3 turned the MgSO4 white
MgSO4 + Na2CO3 Fizz or cloud The two combined and thickened
B. Follow-Up Questions
1. What type of macroscopic evidence for chemical change did you observe during this experiment? Give at least three different examples. (15 points)
- The food coloring + CH3COOH darkening in color, food coloring + NaOCI + CH3COOH returning to clear, red cabbage + NH3 turning green, red cabbage + CH3COOH turning pink, NaHCO3 + CH3COOH bubbling over, Na2CO3 + CH3COOH fizzing and turning cloudy, MgSO4 + NH3 turning white, and the MgSO4 + Na2CO3 becoming thick are all examples of macroscopic evidence for chemical change.
2. Which reactions, if any, do you believe showed no evidence of chemical change? Justify your reasoning. (15 points)
- I believe the food coloring + NaOCI show no evidence of chemical change because they would not combine. I think that the properties of bleach that allow it to remove stains (color) from things are the same properties that disallow them to combine and have a reaction or change.
3. When two solutions combine and a solid substance is formed, this