Transcript Unit 3: Nuclear Chemistry

Unit 3: Nuclear
Chemistry
Day 4: Average Atomic Mass, Perception of Risk,
and Band of Stability
Warm Up
OPEN TO WARM UP SECTION AND ANSWER
THE FOLLOWING QUESTIONS:
1. What is an isotope?
2. What is the difference between Carbon-12
and Carbon-14?
3. True OR False: An Oxygen atom can have 8
protons OR 9 protons.
4. True of False: A Lithium atom can have 3
neutrons OR 4 neutrons.
TIME: 4 minutes
WHEN DONE: Show me Margin Notes for
Isotope Reading
Agenda
 Review
 Notes:
Isotope Reading
Average Atomic Mass
 Practice:
Average Atomic Mass
 Radioactivity:
Perception of Risk
FINAL: MONDAY, JANUARY 23RD
(ONLY 5 CLASSES LEFT AFTER
TODAY)
Review Reading and Questions
TAKE OUT: Reading on Isotopes
SHARE OUT: Margin Notes with
a Table Partner
DUE ON TUESDAY!
TIME: 4 MINUTES
WHEN DONE: Set up Cornell
Note on next available RightHand Page, Title: Average
Atomic Mass
Set Up Cornell Note:
ON NEXT AVAILABLE RIGHTHAND PAGE: Set Up Cornell
Note
Title: Average Atomic Mass
Essential Question: Why does
the atomic mass have a
decimal on the periodic table?
TIME: 2 MINUTES
Average Atomic Mass
EQ:
1/6/17
Why does the atomic mass have a decimal on
the periodic table?
Atomic Mass Review
• ATOMIC MASS = # PROTONS + # NEUTRONS
• This also means,
#NEUTRONS = ATOMIC MASS - # PROTONS
Three Ways to express Atomic Mass
1. Sulfur – 32
2. 32S
3. Sulfur has an average atomic mass of
32.066 amu
Unit for Atomic Mass
• Atomic mass is measured in amu, like your
height is measured in feet (in USA)
• amu= atomic mass unit
Average Atomic Mass
EQ:
1/6/17
Why does the atomic mass have a decimal on
the periodic table?
Isotopes
• Two or more atoms with the same number of
protons, but a different number of neutrons
• The most common isotopes of an atom can be
found more frequently
• Relative Abundance – how frequent an
isotope is found on earth
CHUNK and
HIGHLIGHT
NOTES
TIME: 2 MINUTES
Average Atomic Mass
EQ:
1/6/17
Why does the atomic mass have a decimal on
the periodic table?
Calculating Average Atomic Mass
Relative abundance of sulfur-32 is 95.00%,
sulfur-33 is 0.76%, sulfur-34 is 4.22%.
Practice: Average Atomic Mass
COMPLETE: Average Atomic Mass
USE: Notes and Table Partners
TIME: 14 MINUTES
WHEN DONE: Turn into class box
and work on ISOTOPE reading
homework (choose any 5
questions)
Perception of Risk
COMPLETE: Perception of Risk
WRITE: Your assumption about
exposure to radioactivity
TIME: 3 MINUTES
WHEN DONE: Be ready to discuss
with your table partners
Perception of Risk
SHARE OUT: Your perception of
risk with your table partners
CALCULATE: Group Average of
your table group
TIME: 4 MINUTES
WHEN DONE: Be ready to share
out
Band of Stability
GLUE: Graph into your “Unit 3
Toolbox”
DISCUSS: With Table Partners
 What are the independent and
dependent variables?
TIME: 4 MINUTES
WHEN DONE: Be ready to share out
your answers and add to your toolbox