Livia and Kathrine
Abstract:
The purpose of this procedure was to observe copper's chemical behavior after heating it in a crucible and breaking the solid pieces apart. We found that in doing this procedure, we had to be very conscientious of time and the placement of the crucible, because of the heat being used. The total mass of copper before we heated it was 1 g, and then the copper after the procedure remained the same at 1 g.
Procedure:
We first measured the mass of a clean, empty crucible, which was 17.71 g. Then, we added about 1 g of powder to the crucible, which totaled to be 18.78 g. We set the crucible on the hot plate and let it sit for 2 minutes. Then we held the crucible with a pair of tongs while we used a spatula to break up the solid in the crucible in order to expose as much remaning copper metal as we could. We repeated this step for about 10 more minutes, breaking up the solid copper with a spatula every two minutes. Then we let it cool to room temperature.
After the copper in crucible had cooled, we measured it's mass to be the same as it was before.
1. a. As the crucible started to heat, the copper darkened after every 2 minute cycle.
b. Yes, the copper atoms remained in the crucible, but there were some fumes merging from the crucible, meaning that some atoms were lost.
2. a. The changes were chemical changes.
b. After the copper was heated it became black and a solid block.
3. a. The mass is the same as before.
b. The mass of the copper did not change.
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