Counting by Weighing Activity

Purpose Question:

How can you count small things without actually counting them?

1. Find the mass of 2 dozen particles of rice.
2. Calculate the average mass of one particle of rice.
3. Determine the mass of one hundred pieces of rice without actually counting them. Explain what you did.
4. Determine the mass of 1500 particles of rice without actually counting them.
5. Find the average mass of 1 copper atom.
6. What is the mass of 1 mole of copper atoms

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 6.022 x 10²³ One MOLE of anything has 6.022 x 10²³ items

7. How many copper atoms are in 1 mole.
8. How many copper atoms are in 10 moles 
9. How many copper atoms are in 12 moles
10. How many H₂O molecules are in 2 moles
11. What is the mass of one H₂O molecule?
12. What is the mass of 1 mole of H₂O molecules?
13. What is the mass of 2.5 moles of H₂O molecules?
14. Explain how you would go about collecting 1.5 X 10²⁴ molecules of water?
15. If I have 1 mole of H₂O molecules, how much hydrogen atoms and oxygen atoms do I have?
16. Explain how you would determine how many hydrogen atoms there are in 45 grams of water.
 

Research a real world application of the concept of counting by weighing. Write a short summary.