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Thursday, February 21

Chemistry Week 23

Please get out your Classwork!

February 21, 2013

AGENDA:

1 – Bell Ringer & Agenda

2 – Review Classwork

3 – Review Predicting Products

4 – Quiz Review

Today’s Goal:

Students will be able to review for their Unit 5 Quiz #2

Homework

- Complete Quiz Review– due tomorrow.
- Final day for Lab Report is Tomorrow!
- Week 22 Work is due by FRIDAY!!
- STUDY FOR YOUR QUIZ

Thursday, February 21

Objective:

Students will be able to review for their Unit 5 Quiz #2

Bell Ringer:

What is the molar mass of Na2SO4?

Na =

S =

O =

Thursday, February 21

Objective:

Students will be able to review for their Unit 5 Quiz #2

Bell Ringer:

What is the molar mass of Na2SO4?

Na =

S =

O =

Thursday, February 21

Objective:

Students will be able to review for their Unit 5 Quiz #2

Bell Ringer:

What is the molar mass of Na2SO4?

Na =

S =

O =

Objective:

Students will be able to review for their Unit 5 Quiz #2

Bell Ringer:

What is the molar mass of Na2SO4?

Na =

S =

O =

February 21, 2013

AGENDA:

1 – Bell Ringer & Agenda

2 – Review Classwork

3 – Review Predicting Products

4 – Quiz Review

Today’s Goal:

Students will be able to review for their Unit 5 Quiz #2

Homework

- Complete Quiz Review– due tomorrow.
- Final day for Lab Report is Tomorrow!
- Week 22 Work is due by FRIDAY!!
- STUDY FOR YOUR QUIZ

Thursday, February 21

Objective:

Students will be able to review for their Unit 5 Quiz #2

Bell Ringer:

What is the molar mass of Na2SO4?

Na =

S =

O =

23.0 g/mol

32.0 g/mol

4 x 16.0 = 64 g/mol

119.0 g/mol

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?

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.

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

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

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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