Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. In the image to the right, note a dozen eggs, a dozen donuts and
12
a dozen roses. How many of each item do you have?
no
2. Would a dozen of each object have the same mass?
3. Suppose you have a dozen carbon atoms, a dozen gold atoms, and a dozen iron atoms.
Even though you have the same number of each, would you expect them all to have the
same mass? Explain.
No I would not expect them to have the same mass because they are made different atoms.
When counting roses, eggs, or donuts, a dozen is a good unit to
use. If you are counting atoms, however, a dozen is not much help.
In the Moles Gizmo, you will learn about a unit used to count atoms.
On the AVOGADRO CONSTANT tab, place the copper (Cu) atom
on the nano-balance on the left, which will show the average atomic
mass of copper rather than the mass of a single copper atom.
1. What is the average mass of a copper atom? 63.546 u
The unit “u” refers to unified atomic mass units. A single proton or neutron has a mass of
approximately one atomic mass unit. (Officially, 1 u is one-twelfth the mass of a C-12 atom.)
2. To gain an idea as to how many atoms are in a gram or so of copper, use the larger balance
on the right. Press Add atoms to put a scoop of atoms in the weighing dish, and keep
adding until the balance registers between 1 and 2 grams. If you don’t seem to be making
much progress, adjust the exponent using the slider, which will make the scoop size bigger.
20
How many atoms did you need to add? 1.01 x 10
2019
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