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Mastering the Mole: Understanding Molar Mass in Chemistry

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Learn to define the mole, calculate molar mass, and analyze chemical reactions in this comprehensive chemistry lesson. Practice problems and detailed notes provided.

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Mastering the Mole: Understanding Molar Mass in Chemistry

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  1. Chemistry Week 23 Please get out your homework!

  2. February 20, 2013 AGENDA: 1 – Bell Ringer & Agenda 2 – Review Lab 3 – Notes: Mole and Molar Mass 4 – Summary 5 – Start Classwork Today’s Goal: Students will be able to define the mole and calculate molar mass. Homework • Complete Classwork – due tomorrow. • Week 22 Work is due by FRIDAY!! • Your Lab Report is DUE TODAY!

  3. Wednesday, February 20 Objective: Students will be able to define the mole and calculate molar mass. Bell Ringer: Count up the number of each type of atom in aluminum silicate: Al2(SiO3)3 Al = Si = O =

  4. 2MINUTES REMAINING…

  5. Wednesday, February 20 Objective: Students will be able to define the mole and calculate molar mass. Bell Ringer: Count up the number of each type of atom in aluminum silicate: Al2(SiO3)3 Al = Si = O =

  6. 1MINUTES REMAINING…

  7. Wednesday, February 20 Objective: Students will be able to define the mole and calculate molar mass. Bell Ringer: Count up the number of each type of atom in aluminum silicate: Al2(SiO3)3 Al = Si = O =

  8. 30 seconds Remaining…

  9. Wednesday, February 20 Objective: Students will be able to define the mole and calculate molar mass. Bell Ringer: Count up the number of each type of atom in aluminum silicate: Al2(SiO3)3 Al = Si = O =

  10. 10 seconds Remaining…

  11. BELL-RINGER TIME IS UP!

  12. February 20, 2013 AGENDA: 1 – Bell Ringer & Agenda 2 – Review Lab 3 – Notes: Mole and Molar Mass 4 – Summary 5 – Start Classwork Today’s Goal: Students will be able to define the mole and calculate molar mass. Homework • Complete Classwork – due tomorrow. • Week 22 Work is due by FRIDAY!! • Your Lab Report is DUE TODAY!

  13. Wednesday, February 20 Objective: Students will be able to define the mole and calculate molar mass. Bell Ringer: Count up the number of each type of atom in aluminum silicate: Al2(SiO3)3 Al = Si = O = 2 1 x 3 = 3 3 x 3 = 9

  14. Chemical Reactions Lab 1. Single Rep. Sn + CuSO4 Cu + SnSO4 2. Double Rep. Cu(NO3)2 + K2CrO4CuCrO4(s) + KNO3 Zn + HCl H2(g) + ZnCl2 3. Single Rep. 4. Double Rep. Pb(NO3)2 + KI  PbI2(s) + KNO3 H2O2 H2(g) + O2(g) 5. Decomposition

  15. Cornell Notes • Obj: SWBAT Define the Mole and Calculate Molar Mass • Date: 2/20/2013 • A mole is a quantity used to measure the amount of matter present. • Like a dozen = 12 • A mole = 6.02 x 1023 • A dozen doughnuts = 12 doughnuts • A mole of carbon = 6.02 x 1023atoms (particles) of C • A mole of LiF = 6.02 x 1023 atoms of Li and F What is the mole and how is it defined?

  16. Cornell Notes (continued) How do you determine the number of moles of a compound in a chemical reaction? • The coefficients in a balanced chemical equation represent the number of moles of that compound that was reacted or produced. __ Na + __Cl2 __ NaCl 2 2 1 Na = 1 Na= 1 Cl = 2 Cl = 1 x 2 =2 x 2 =2 x 1 =2 x 2 =2 • In the chemical reaction 2 moles of sodium react with 1 mole of chlorine to form 2 moles of sodium chloride.

  17. Cornell Notes (continued) What is molar mass? • Since the mole is always the same number, a mole of different elements or compounds will have different masses. • The mass of 1 mole was defined by Carbon-12. • 1 mole of carbon = 12 g 1 mol • 6.02 x 1023 atoms carbon = 12 g

  18. Cornell Notes (continued) How do you calculate molar mass? • Determine types of atoms in a compound. • Determine the number of each type of atom. • Find their atomic masses. • Sum all masses! Units = g / mol

  19. Practice Problems (Left Side) NaCl = Na = Cl = 58.5 g 1 mol Ag = 107.9 g 1 mol LiNO3 = Li = N = 3 x O = 68.9 g 1 mol 23.0 6.9 35.5 14.0 + + (3x16.0)

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