SCH3U Activity #1 Introduction to the Mole Name: ______
Purpose: To discover a method of counting “things” that you are not able to see.
Information:
▫ When you buy eggs you usually ask for a ______eggs.
You know that one dozen of any item is ______.
▫ Paper is not packaged by the dozen. Paper is packaged by a ream. A ream of paper has 500
sheets. Why is it useful to use units like a dozen or a ream?
______
▫ What determines how many items should make up a particular unit?
______
▫ If you were asked to design a new unit to count something, what would you consider when
choosing how many items should be included in your new counting unit?
______
Materials: 3 different types of candy, balance, worksheet, calculator, pencil
Procedure:
1. Record the number of different types of candy in each package.
2. Measure the mass of each different type of candy. Record this information in the data table.
3. Answer the questions in the Analysis and Interpretations section.
Data: Each different type of candy contains ______items.
Name of items in the package / Mass of the candies (g)Analysis and Interpretation:
1. As you know, a dozen represents 12 items. Since I did not have enough items to make a dozen, I decided to make a new counting unit. I called this unit a NORBS. Each of your packages contains a different type of candy with _____ items. We will call this number of items a NORBS. If you understand the concept of NORBRATEN as a counting unit, just like a dozen for counting by 12, you should be able to complete the following questions.
Questions
A NORBS of oranges will have _____ oranges.
A NORBS of pretzels has ____ pretzels.
A NORBS of desks has _____ desks.
A NORBS of molecules of water has ____ molecules of water.
A NORBS of particles has ___ particles.
A NORBS of atoms of iron has _____ atoms of iron.
A NORBS of formula units of salt has ______formula units of salt.
Now that you understand the meaning of a NORBS, you should be able to answer the following
questions:
a. How many Hershey’s Kisses are in 2 NORBS? ______
b. How many caramels are in 10 NORBS? ______
c. How many Hershey’s Kisses are in 400 NORBS? ______
d. How many caramels are in 1/2 NORBS? ______
e. How many chips in a ¼ NORBS? ______
WRITE DIRECTIONS FOR FINDING THE # OF ITEMS IF GIVEN THE # OF NORBS.
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Show your directions to the teacher. Use the above directions to answer the following questions.
1. How many pencils are in 20 NORBS? ______
2. How many pencils are in 100 NORBS? ______
3. How many apples are in 10 NORBS? ______
4. How many oranges are in 5 NORBS? ______
5. How many pencils are in 0.5 NORBS? ______
6. How many pencils are in 0.25 (1/4) NORBS? ______
7. How many atoms of silver are in 20 NORBS? ______
8. How many molecules of water are in 10 NORBS? ______
Finding the Number of NORBS
If you are given the number of items you can tell the number of NORBS.
For example, since one NORBS is 4 items, 8 items make up 2 NORBS.
i. How many NORBS are 16 Hershey’s Kisses? ______
ii. How many NORBS are 100 pretzels? ______
iii. How many NORBS are 400 desks? ______
iv. How many NORBS is 1 orange? ______(Write a fraction or a decimal.)
v. How many NORBS are 2 caramels? ______
Write directions for finding the number of NORBS if given the number of pieces.
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______
Use the above directions to answer the following questions.
Show what you did to find each answer beside each line.
1. How many NORBS are 48 Hershey’s Kisses? ______
2. How many NORBS are 2 Hershey’s Kisses? ______
3. How many NORBS are 32 Hershey’s Kisses? ______
4. How many NORBS are 3 Hershey’s Kisses? ______
5. How many NORBS are 24 Minty Bells? ______
6. How many NORBS are 2 Minty Bells? ______
7. How many NORBS are 20 caramels? ______
As you can imagine, a NORBS of molecules of water would be too small to see. Scientists had to
select a bigger unit for counting molecules of substances.
The unit scientists use is called a MOLE.
One MOLE of anything has 602,200,000,000,000,000,000,000 items.
This number is called AVOGADRO’S NUMBER and is usually written in scientific notation as
6.02 x 1023
**One MOLE of anything has 6.02 x 1023 items.**
Use the rules you have written for calculations involving NORBS to answer questions about
MOLES. Remember to use 6.02 x 1023 for the number of items in a MOLE.
Recall how to multiply numbers written in scientific notation. Significant digits should be observed.
Note: Atoms and molecules in these questions are words meaning items.
1. How many Hershey’s Kisses make up 1 MOLE? ______
2. How many caramels make up 10 MOLES? ______
3. Find the number of Minty Bells in 4 MOLES. ______
4. Find the number of atoms of sodium in 2 MOLES. ______
5. Find the number of molecules of water in 6 MOLES. ______
6. Find the number of caramels in 0.5 MOLES. ______
7. How many moles of caramels are 6.02x1023 of caramels? ______
8. How many moles of desks are 6.02x1023 of desks? ______
9. How many moles of pens are 12.04x1023 of pens? ______
10. How many moles of sodium atoms are 12.04x1023 of sodium atoms? ______