Overwriters Laboratories inc.

Fear The Penguins!

Paul Atkinson, Scott Jaderholm, Cedric Shock

Lab On Percent Composition

Purpose

Give us practice in determining the percent composition of a compound and calculate the percent of carbon dioxide produced by a reaction of burning copper (ii) carbonate.

Method

We heated some copper (ii) carbonate to decompose it into carbon dioxide and copper oxide.

Data & Observations

Mass of an empty crucible	12.42 g
Mass of crucible with copper (ii) carbonate	15.42 g
Mass of copper (ii) carbonate	3.00 g
Mass of crucible and contents after burning	14.60 g

When the crucible was heated over the burner the color the contents changed from a brown to a black. This indicated that some sort of chemical change was occurring.

We tested the contents of the crucible with a burning splint. Every time we placed the splint in the crucible it was extinguished. This suggests a high concentration carbon dioxide gas was lingering inside the crucible.

Calculations

Mass of copper (ii) oxide produced	2.18 g
Mass of carbon dioxide produced	.82 g
Percent copper (ii) carbonate	72.7 %
Percent carbon dioxide	27.3 %

Conclusion

This reaction produced 27.3 % carbon dioxide.