Lab report
OLD COINS TURN TO GOLD
DESIGN:
Problem or Research Question: How does zinc effects the color change in a copper penny?
Hypothesis: If copper and zinc comes together, then it will form brass, which gives gold color to copper penny.
Variables:
There were no variables at this experiment
PROCEDURES:
Materials: Zinc (SN) filling, 3M NaOH solution, Copper penny, tongs, Hot plate, 100 ml beaker, 250 ml beaker, Bunsen burner, Water, Spoon.
Procedure:
First, we turned on the hot plate.
Then, we filled 250 ml beaker with 125 ml of water.
We put half a spoon of zinc fillings.
We add 20 ml of 3M NaOH solutions in it.
We placed the beaker on the hot plate, which we had turned on before.
We put the penny into the beaker.
After it started to boil, we removed the penny from the beaker, using tongs.
DATA COLLECTION AND PROCESSING:
Observations: The color changing process took longer than we had expected. We observed that after putting the penny in the beaker, the zinc powder surround the penny, which helped it changed its color. We couldn’t complete the experiment so when we took the penny from the beaker, the change in the color wasn’t completed. There were some dark spots and some light parts.
Results Table/Graph:
The color of the penny
Before the experiment
Dark Brown
After heating with zinc and 3M NaOH
Light Brown
The expecting color at the end of the experiment
Gold
Interpretation: None of the groups were able to finish the experiment so we don’t have an acceptable result/observation. When you look up the literature, it says that, while the penny was in the boiling mixture zinc and NaOH solution, the zinc coated a thin layer around the penny and when you heated it over the Bunsen burner, the zinc and copper in the penny mixed and formed brass (alloy) which give the color of a gold to the copper.
Qualitative Observations: The penny was dark brown before the experiment. At the end of the lesson, there were some
DESIGN:
Problem or Research Question: How does zinc effects the color change in a copper penny?
Hypothesis: If copper and zinc comes together, then it will form brass, which gives gold color to copper penny.
Variables:
There were no variables at this experiment
PROCEDURES:
Materials: Zinc (SN) filling, 3M NaOH solution, Copper penny, tongs, Hot plate, 100 ml beaker, 250 ml beaker, Bunsen burner, Water, Spoon.
Procedure:
First, we turned on the hot plate.
Then, we filled 250 ml beaker with 125 ml of water.
We put half a spoon of zinc fillings.
We add 20 ml of 3M NaOH solutions in it.
We placed the beaker on the hot plate, which we had turned on before.
We put the penny into the beaker.
After it started to boil, we removed the penny from the beaker, using tongs.
DATA COLLECTION AND PROCESSING:
Observations: The color changing process took longer than we had expected. We observed that after putting the penny in the beaker, the zinc powder surround the penny, which helped it changed its color. We couldn’t complete the experiment so when we took the penny from the beaker, the change in the color wasn’t completed. There were some dark spots and some light parts.
Results Table/Graph:
The color of the penny
Before the experiment
Dark Brown
After heating with zinc and 3M NaOH
Light Brown
The expecting color at the end of the experiment
Gold
Interpretation: None of the groups were able to finish the experiment so we don’t have an acceptable result/observation. When you look up the literature, it says that, while the penny was in the boiling mixture zinc and NaOH solution, the zinc coated a thin layer around the penny and when you heated it over the Bunsen burner, the zinc and copper in the penny mixed and formed brass (alloy) which give the color of a gold to the copper.
Qualitative Observations: The penny was dark brown before the experiment. At the end of the lesson, there were some