1. If starting Candium Lab, sit in the back and start.
Warm-Up 10/28/14
If starting Candium Lab, sit in the back and start.
If finished with Candium Lab, sit in the front. Answer the Post-Lab Questions.

2. Understand average atomic mass.
Objective 10/28/14
Understand average atomic mass.
Agenda 10/28/14
Warm-Up
Average Atomic Mass
Candium Lab

3. Half – Average Atomic Mass Lesson
Today’s Activities
Split Class
Half – Average Atomic Mass Lesson
Half – Candium Lab
15-20 mins each

5. Where do these decimal numbers come from??
Average atomic mass!

6. The mass of an atom or isotope is measured in atomic mass unit (amu).
Average Atomic Mass
Calculated using the mass and relative abundance of known isotopes of the element.
The mass of an atom or isotope is measured in atomic mass unit (amu).

7. Average Atomic Mass
Relative Mass = Relative Abundance x Mass of Isotope
Average Atomic Mass = Sum of Relative Masses

8. Answer

9. Calculate the average atomic mass of carbon:
You Try!
Calculate the average atomic mass of carbon:

10. You Try!
Does it match??

11. Universe Comic Strip due tomorrow, 10/29/14
Homework
Universe Comic Strip due tomorrow, 10/29/14
Upcoming…
Test Next Monday, 11/3/14
Study Guide