1) The document discusses the mole, which is used to count and measure large numbers of atoms. The mole represents 6.022x1023 atoms, which is Avogadro's number. 2) It explains how to convert between the number of moles of an element and the number of atoms/molecules through the use of Avogadro's number. 3) Key points covered include what a mole represents, what Avogadro's number is, and practice problems for converting between moles and numbers of particles through calculations using Avogadro's constant of 6.022x1023 particles per mole.

1. Chapter 8: The MoleSection 8-1: How are atoms counted and measured?

2. Review: Chapter 3Bonus Point Opportunity! Atomic Theory:All Matter is composed of atomsWhat is the SI unit for the amount of substance?The MoleAvagadro’s Number6.022 X 1023 particles/atoms/ions

3. Lesson Overview and ObjectivesBy the end of this lesson you will understand how atoms are counted and measuredYou will be able to define a mole and what it representsYou will be able to recite Avagadro’s number and what it representsYou will be able to convert from the number of moles in an element to the number of particles/atoms/ions/etcYou will be able to convert from the number of particles/atoms/ions/etc in an element to the number of moles

4. Review: ConversionsMath ReviewIf you have 26 meters how many kilometers do you have?What are we looking for?KilometersHow do we set up the conversion so meters cancel? 26 m X 1 km 1 1000 m 26 m X 1 km = 1 1000 m 26 km = .026 km 1000

5. What is a Mole?Elements are made up of atoms - the number of atoms in a small sample of an element is astronomical Scientists needed to find a way to deal with them on a larger scale- so they created a new unit of quantityThe mole is:The number of atoms in exactly 12g of carbon-12

6. What Does a Mole Represent?“Is a counting unit used for measuring an amount of a substance”Refer to table 8-1 on page 275 in textEaster Eggs, pennies, spoons

7. What is Avagadro’s Number?Avagadro’s number is the number of particles in a mole6.022 X 1023 particles in a moleAvagadro’s number is a constant, meaning that it does not change

8. What Does Avagadro's Number Represent?While Avagadro’s number represents the number of particles in a mole, particles has multiple meaningsParticles can mean:Atoms, Ions, molecules, electrons, bonds, etcHow many atoms are in a mole?6.022 X 1023How many Ions are in a mole?6.022 X 1023How many molecules are in a mole?6.022 X 1023

9. Concept Check: Avagadro’s NumberWhat is Avagadro’s Number?Avagadro’s number is the number of particles in a mole6.022 X 1023What can a particle represent?AtomsIonsMoleculesHow many moles are in 6.022 X 1023 atoms of H?1 moleHow many Ions are in one mole of Na?6.022 X 1023How many atoms are in 2 moles of He?1.2044 X 1024

10. Conversion Time: Moles to AtomsConvert 4.2 Moles of He to atomsConvert 3.6 Moles of N to atomsConvert 1.3 Moles of C to ionsConvert 2.6 moles of Na to molecules

11. Conversion Time: Atoms to MolesConvert 6.4 X 1023 atoms of S to MolesConvert 8.6 X 1024 atoms of F to MolesConvert 1.3 X 1023 atoms of Si to MolesConvert 4.2 X 1023 ions of Ni to MolesConvert 2.3 X 1023 molecules of C to Moles

12. Wrap-UpWhen converting atoms/ions/molecules/etc to moles what constant do you use?6.022 X 1023 What is that constant called?Avagadro’s NumberHow many ions are in one mole?6.022 X 1023Questions?