Download STEM Fair Introduction Beanium Isotopes Lab

Beanium Isotopes Lab
 Objectives
 Today I will be able to:
 Calculate atomic masses of isotopes given a set of data
 .
 Informal Assessment – monitoring student interactions
and questions as they complete the practice and the
project
 Formal assessment – analyzing student responses to
the exit ticket, lab and practice problems
 Common core connection
 Make sense of problems and persevere in solving them
 Reason abstractly and quantitatively.
 Come to understand other perspectives and cultures
Lesson Sequence
 Evaluate: Warm –Up
 Evaluate: Homework Questions?
 Explain: Modern Atomic Theory/Isotope Notes
 Elaborate: Isotope Practice
 Engage/ Explore: History of the Atom Project
 Evaluate: Exit Ticket
Warm-Up
 Complete the half sheet!
DRILL QUIZ!!!  - (A-Day)
 Write the answers from the drill on September 9 and
September 17.
DRILL QUIZ!!!  - (B-Day)
 Write the answers from the drill on September 12 and
September 20.
Objective
 Today I will be able to:
 Calculate isotopes of beanium by collecting data and
completing a lab.
 Research a scientist to understand the history of the atom
Homework
Agenda
 Warm –Up
 Homework Questions?
 Modern Atomic Theory/Isotope Notes
 Isotope Practice
 History of the Atom Project
 Exit Ticket
Modern Atomic
Theory/Isotope Notes
Modern Atomic Theory
 Atom – smallest part of
matter that represents
a particular element
 Composed of electrons,
protons, and neutrons
 Protons and neutrons
(nucleons) form the
nucleus of an atom
 Mostly empty space
Subatomic Particles
Name
Symbol
Charge
Proton
p+
+1
Neutron
n
0
Electron
e-
-1
Subatomic Particles
Name
Mass (g)
Mass (amu)
Location
Proton
1.673 x 10-24
1
Nucleus
Neutron
1.673 x 10-24
1
Nucleus
Electron
9.109 x 10-28
(considered
to be zero)
.0005
Outside
Nucleus
Do particles smaller than protons
and neutrons exist?
 Quarks – subunits of protons and neutrons
 Never observed directly or found in isolation
 6 “flavors” or different types
 Most common are:
 “Up” quark = +2/3
 “Down” quark = -1/3
 “Up” and “down” quarks are the most stable
 “Up” and “down” quarks have the smallest mass are the
lowest energy
Quarks
 Protons are made of two “up” quarks and one “down”
quark
 Neutrons are made of one “up” quark and two “down”
quarks
 Quarks are held together by “gluons”
How do electrons form?
 Mesons – particles made of quarks
 Short-lived particle - produced by high energy
interactions of matter
 Mesons decay to form electrons
If each proton and neutron has a
mass of one amu, then why aren’t
the atomic masses on the periodic
table whole numbers?
 Isotopes of elements
 atoms with the same number of protons but different
numbers of neutrons
Isotopes
 Some isotopes are found more common than others
 We can determine which isotope is more common by
looking at the atomic mass
 Atomic Mass is calculated weighted averages
How do we calculate a weighted
average?
Category
Score
Exams (50%)
80%
Labs (25 %)
75%
Classwork (15 %)
95%
STEM fair (10 %)
87%
(.50 x 80) + (.25 x 75) + (.15 x 95) + (.10 x 87) =
81. 7 % = 82 %
Atomic Mass is calculated using
the same method of weighted
averages
Carbon Isotope
C – 14
1%
C - 12
99%
(.01 x 14) + (.99 x 12) =
12.02 amu
Isotope Practice
Introduce History of the
Atom Project
Exit Ticket
 Which isotope of carbon is more common C-12 or C14? Explain your answer