Chemistry Week

23

Please get out your

homework!

February 20, 2013AGENDA:1 – Bell Ringer &

Agenda2 – Review Lab3 – Notes: Mole and

Molar Mass4 – Summary 5 – Start Classwork

Today’s Goal:Students will be able to

define the mole and calculate molar mass.

Homework1. Complete Classwork –

due tomorrow.2. Week 22 Work is due

by FRIDAY!!3. Your Lab Report is

DUE TODAY!

Wednesday, February 20Objective: 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 MINUTES REMAINING…

Wednesday, February 20Objective: 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 =

1 MINUTES REMAINING…

Wednesday, February 20Objective: 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 =

30 seconds Remaining…

Wednesday, February 20Objective: 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 seconds Remaining…

BELL-RINGER TIME IS

UP!

February 20, 2013AGENDA:1 – Bell Ringer &

Agenda2 – Review Lab3 – Notes: Mole and

Molar Mass4 – Summary 5 – Start Classwork

Today’s Goal:Students will be able to

define the mole and calculate molar mass.

Homework1. Complete Classwork –

due tomorrow.2. Week 22 Work is due

by FRIDAY!!3. Your Lab Report is

DUE TODAY!

Wednesday, February 20Objective: 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 =

21 x 3 = 33 x 3 = 9

Chemical Reactions Lab

1. Single Rep.Sn + CuSO4 Cu + SnSO4

2. Double Rep.

Cu(NO3)2 + K2CrO4 CuCrO4 (s) + KNO3

3. Single Rep.

Zn + HCl H2 (g) + ZnCl24. Double

Rep. Pb(NO3)2 + KI PbI2(s) + KNO3

5. Decomposition

H2O2 H2 (g) + O2 (g)

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 1023

atoms (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?

Cornell Notes (continued) The coefficients in a balanced

chemical equation represent the number of moles of that compound that was reacted or produced.

How do you

determine the

number of moles

of a compound in a

chemical

reaction?

__ Na + __Cl2 __ NaCl Na = 1 Na= 1 Cl = 2 Cl = 1

x 2 =2x 1 =2

x 2 =2x 2 =2

22 1

In the chemical reaction 2 moles of sodium react with 1 mole of chlorine to form 2 moles of sodium chloride.

Cornell Notes (continued) 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

What is molar mass?

Cornell Notes (continued)1. Determine types of atoms in a

compound.2. Determine the number of each

type of atom.3. Find their atomic masses.4. Sum all masses! Units = g /

mol

How do you

calculate molar mass?

Practice Problems (Left Side)

Ag =107.9 g1 mol

NaCl =Na =

Cl = 58.5 g 1 mol

LiNO3 =Li =N =

3 x O = 68.9 g 1 mol

23.035.5+

6.914.0

+ (3x16.0)