GIZMOS STUDENT EXPLORATION: MOLES –UPDATED ANSWER KEY
Directions: Follow the instructions to go through the simulation. Respond to the questions
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prompts in the orange boxes.
Vocabulary: atomic mass, Avogadro constant, conversion factor, dimensional analysis, mole, molar mass,
molecular mass, scientific notation, significant figures, unified atomic mass unit
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. In the image to the right, note a dozen eggs, a dozen donuts and a dozen roses.
How many of each item do you have?
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.
Gizmo Warm-up
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?
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. How many atoms did you need to add?
A dozen represented as 12 in total is 36
No, it will not have the same mass or weight.
By weight they have the same mass. mass is the measure of the amount of matter or
the substance that makes up an object. But the number of the atom is different.
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