CHEMISTRY: Counting Atoms Lab

October 15, 2007
Counting Atoms Lab

Problem: How can you best approximate the number of atoms in an object made up of one element.

Hypothesis: ­­­­­­­­­­­­­­­­­­­­­­­­_______________________________________________

Materials: copper couplings, lead weights, aluminum rivets, scale.

Procedures:
1.) Select a number of pieces of each element and record how many you chose to weigh.
2.) Carefully weigh each element separately and record the mass of each element.
3.) Use the mass -----> moles conversion,
then use moles -----> number of atoms conversion to find the number of moles of each element and the approximate number of atoms contained in the objects.

Data:

Copper Couplings
-Number and types of pieces____________________________
-Mass of items selected___________________
-Moles of Copper____________________________
-Number of Copper atoms­­­­­­­­­­­­­­­­­____________________

Aluminum Rivets
-Number of rivets_____________________
-Mass of rivets_____________________
-Moles of Aluminum___________________
-Number of Aluminum atoms_______________

Lead Weights
-Number of weights___________
-Mass of weights_____________
-Moles of Lead______________
-Number of Lead atoms_____________________