Transcript WARM UP 9/17

WARM UP 9/18
1.
2.
3.
4.
5.
How did you do on your test? Predict your
grade.
How long did you study?
Is there anything you could have done better to
prepare?
Summarize in three sentences or less what you
learned from chapter 1.
Write 5 things that come to mind when I say
“chemistry”.
NOTES 9/18
CH2: CHEMISTRY OF LIFE
BIOCHEMISTRY

The chemistry of living things.
History of the ATOM
460 BC –
DEMOCRITUS
*matter divided until
smallest part
“atomos” – unable to cut
1800’s – DALTON
*basic unit of all matter
is atoms
* solid, undividable
particles
1900’s –
RUTHERFORD
•
•
Spheres with mostly
space
Smaller particles in
them
Subatomic articles – parts in an
atom
1.
2.
3.
Proton + charge
Neutron no charge
Electron - charge
ATOMIC NUMBER
# of protons in an atoms
Makes each atom
different
Most atoms neutral, so
# protons = # electrons
ION – an atom with a charge
because of too many or not
enough electrons
(makes the atom more reactive)
ANION – Too many e- , so charge is negative
CATION – Not enough e-, so charge is positive
ATOMIC MASS (NUMBER)

Total number of
protons and neutrons
in an atom
ELEMENT – substance made of
only one kind of atom
EXAMPLE
Atomic
6
Number
Carbon
C
Atomic
Mass
Number
12.001
2.4
Element
Periodic Table

1869 – MENDELEEV

Organizes all the
elements in a
systematic way
In order of atomic
number
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PERIOD – each row
across
7 periods
All elements in same
row are in same period

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GROUP - (family)
Each column

Elements in same
group have similar
properties

18 groups
2 main groups – metals
and nonmetals
Hydrogen acts as both
ASSIGNMENT
Element
symbol
group
period
Atomic Mass
#
#
#
protons
O, C, H, N, Ca, P, K, S, Na, Cl, Mg, I, Fe
Metal or % of
nonmetal body
O 65%
C 18.5%
H 9.5%
N 3.2%
Ca 1.5%
K .4%
Fe .1%
S .3%
Na .2%
Cl .2%
Mg .1%
I .1%
P 1%
ASSIGNMENT 9/17

Finish chart – front and back – show me today
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Page 34-36 READ – WRITE QUESTIONS
1. How many electrons in an atom?
2. How many e- can the 1st shell hold?
3. The 2nd shell?
4. The outermost shell?
5. What is important about the # and arrangement
of e- in an atom’s outermost shell?
6. When is an atom chemically reactive?
7. What does chemically reactive mean?
8. What if the e- in the outer shell are paired?