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Gizmos Student Exploration: Moles Answer Key
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Gizmos Student Exploration: Moles Answer Key
Gizmos Student Exploration: Moles Answer Key
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- October 27, 2021
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- 2022/2023
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gizmos student exploration moles answer key
gizmos student exploration moles
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Gizmos Student Exploration: Moles Answer Key
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Ma Name: Lee Arthur Date: Student Exploration: Moles 12 2. Would a dozen of each object have the same mass? No 3. Suppose you have a dozen carbon atoms, a dozen gold atoms, and a dozen iron atoms. Even though youhave the No the mass of each one should be different Gizmo Warm-up 63.546u The unit “u” refers to unified atomic mass units. A single proton or neutron has a mass of approximatelyone atomic 2.21 , Get the Gizmo ready: Introduction: Since atoms are so tiny, chemists have devised a unit known as the mole. A mole represents amacroscopic Question: How many particles are in a mole? 1. Explore: Note the average atomic mass of copper on the nano-balance. Add atoms to the larger balance until it How many atoms did you need to add? 6.02214076 x 10^23 2. Explore: Repeat the same procedure with carbon, then sulfur and aluminum. A. For each element, how many atoms did youneed 6.0221 x 10 ^23 Same atoms needed 3. Discover: In each case, you measured out one mole of atoms, since the mass of one mole of any element, in grams, is What is the exact value of the Avogadro constant? 6.02214076 x 10^23 4. Illustrate: The Avogadro constant is so large it is normally written in scientific notation. To get an idea ofthe 602,214,179,300,000,000,000,000 5. Compare: While the number of atoms in a mole is constant, the number of grams in a mole changes basedon the
Directions: Follow the instructions to go through the simulation. Respond to the questions andprompts 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?
same number of each, would you expect them all to have the same mass? Explain.
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 learnabout 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?
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 registersbetween 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?
Activity A:
● Select the AVOGADRO CONSTANT tab.
Molar Mass ● Turn on Show hints and check that Copper (Cu)
is selected.
quantity of matter that can be used in the laboratory. One mole of any element has the same mass in grams as its atomic
mass in u.
registers the same number (in g) as the reading on the nano-balance (in u). Use the Exponent sliderto help get the
correct amount. Stop adding atoms when the readings on both balances match exactly (to the nearest 0.001 g).
to add?
B. What do you notice about the number of
atoms in one mole?
equal to its atomic mass, in u. One mole of any element contains the same number of atoms, a number known as the
Avogadro constant.
enormity of the Avogadro constant, write it out in standard form. (You will need to move the decimal place to the
right 23 times, so you will need to add a lot of zeros!)
element. The number of grams in a mole (g/mol) is known as its molar mass, and has the same
