1. WARM-UP 11/6/13
Take out the Measuring Matters II Worksheet.
Answer the following:
The notes for an unknown element were misplaced. However, we know that it has a mass of g and there were 2.5 moles contained in the sample. What is the unknown element?

2. WARM-UP 11/6/13

3. Understand molar volume
11/6/13 Objective
Understand molar volume
11/6/13 Agenda
Review Mole Lab
Molar Volume

4. Mole Lab – Final Wrap-Up
-Parts A and B:
-It would take a really, really, really long time to count a mole of something.
-It is easier to measure a mole of something than to count it.

5. Mole Lab – Final Wrap-Up

6. Mole Lab – Final Wrap-Up

7. Mole Lab – Final Wrap-Up
-Part D:
After finding the mass of the beaker holding the unknown, to find the mass of just the unknown:

8. Mole Lab – Final Wrap-Up
-Part D:
To find the molar mass (g/mol) of the unknown divide the mass by the number of moles:
mass of unknown
number of moles

9. Mole Lab – Final Wrap-Up
-Part D:
Find the molar masses of the seven possible unknowns and compare to the molar mass of the unknowns.
-KI -NaCl -Ca(OH)2
-NaI -NaOH -Zn -Fe

10. Three ways to measure matter: 1) Counting 2) Mass 3) Volume
Measuring Matter
Three ways to measure matter:
1) Counting
2) Mass
3) Volume

11. Measuring Matter by Volume
-This only pertains to gases measured at STP (standard temperature and pressure)
Why?
-There are variations so we need to set a standard.

12. Measuring Matter by Volume
-What does standard temperature and pressure mean??
Temperature = 0oC (degrees Celsius)
Pressure = 1 atm (atmosphere)

13. Measuring Matter by Volume
Why is STP important when talking about gases?
At STP, one mole of any gas occupies a volume of 22.4L.

14. What? Chemistry tutoring Where? Rm. 401 When? After school
Need tutoring?
Who? Mr. Sapin
What? Chemistry tutoring
Where? Rm. 401
When? After school
Why? Because you want to understand this unit better.

15. For #52: representative particles means atoms or molecules
11/6/13 Homework
Separate sheet:
Pg. 315 #52, 53, 58, 59, 60
For #52: representative particles means atoms or molecules