Download 100610 chem a GALL

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Do Now: Look at your Notebook. If pages are
not hole-punched and placed in the binder,
do that; Portfolios are collected today.
Homework: Finish 2 assigned atom models,
due Friday.
AIMS: TLW continue to apply knowledge of
phase changes, kinetic energy, and the
structure of the atom.
1.
2.
3.
4.
Silently complete Do Now (compile portfolio).
Turn in portfolio today, returned on Friday. Copy
homework.
Review Lesson Steps.
Please draw a diagram and describe the process
of carbon dioxide solid (dry ice) subliming to
form gaseous carbon dioxide- inside a sealed
container. Classwork due today.
Discuss Homework due today:
Pg. 122 #47-51
5.
6.
Atomic models- notes
Homework assigned:
1. Males: Li, F
2. Females: Ne, B
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47. The atomic number is the number of
protons in the atom.
48. How many protons are in the nucleus:
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phosphorus: 15
molybdenum 42
aluminum 13
cadmium 48
chromium 24
lead 82
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49. What is the diff. betw. the mass # and
atomic # in an atom?
The atomic number is the number of protons.
The mass number is the average sum of the
protons and neutrons.
For example, Hydrogen has an atomic
number of one because it has one proton.
Hydrogen only SOMETIMES has a neutron...
The average mass of a hydrogen atom is
1.0079 amu.
atomic number = 2
atomic mass = 4
Element: Helium
Symbol: He
Atomic
number
Mass
number
Number of
protons
Number of
neutrons
Symbol of
element
9
19
9
10
F
14
29
14
15
Si
22
47
22
25
Ti
25
55
25
30
Mn
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51. Two isotopes differ from each other in
the number of neutrons and also in the
atomic mass. They have the same number of
protons.
example: H, Hydrogen, and Deuterium, Which
is an atom of Hydrogen with an atomic mass
of 2 amu.
Hydrogen: 1 proton, 1 electron, NO neutrons
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Deuterium : 1 proton, 1 electron, 1 neutron
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1.
Place RED DOTS on the model to represent
PROTONS.
Place BLACK DOTS on the model to represent
NEUTRONS.
Place GREEN DOTS on the model to represent
ELECTRONS.
Homework assigned:
1. females: Li, F-1
2. males: Ne, B+2