WAY BACK WEDNESDAY! (GEE Prep)
Catalyst – February 8*3, 2010 HW OUT
1) The most important nonspecific
defense against pathogens is
your
a. Tears
b. Mucus
c. Saliva d. Skin
2) The swelling and pain associated
with an inflammatory response
are caused by
a. Secretion of antibodies
b. Expansion of local blood
vessels
c. Secretion of antigens
d. White blood cells destroying
bacteria
3) A protein that helps other
cells resist viral infection is
a. Interferon b. Penicillin
c. Predispose d. Histamine
4) A substance that triggers
the specific defenses of the
immune system is a (n)
a. Antibody
b. Antigen
c. B cell
d. Pathogen
Today’s Agenda
Catalyst
 Graphing ABCs and Practice
 Atomic Size – Figure out the trends with
graphs!
 Work Time
nd Period: GEE Time)
 Exit Question (2
HOMEWORK: ATOMIC SIZE
GEE PACKET DUE FRIDAY!
TEST CORRECTIONS DUE FRIDAY!

Today’s Objectives
SWBAT graph like a rock star!
 SWBAT determine the periodic
trends for atomic size.

2nd Period
Projector
Group 3
Tyler, Johneisha,
Montronique,
Marlon
Group 6
Angel, Erica,
Josh T., Kayla
Group 9
Lashannia,
Heidi, Jeremiah,
Jacob
Group 2
Front Door
Group 1
Quincy, Akiya,
Shante, Howard
Annquinette,
Sedric, Keiara,
Josh D.
Group 5
Group 4
Chris, Brandi,
Durand,
Angelica
Taylor, Ashley,
Tracy, Alex
Group 8
J’nae, George,
Tierra
Group 7
Johnika,
Rodneisha K.,
LaRatio
4th Period
Projector
Front Door
Group 3
Group 2
Group 1
Kendall, Stephen,
Darneisha, Brittney
Chasity, Adam,
Jamal, Cornell
Raven, Desmond,
Holloway, Martha
Group 6
Jeanette,
Selena, Quoc,
Thuy
Group 9
Haley, Frank,
Taylor
Group 4
Group 5
Deston,
Mankisha,
Katie, Treshon
Group 8
Wilbert, Kenisha,
Jarion
Kevin, Tatiyaan,
Arthur, Brhea
Group 7
Celeste,
Hannah,
Jemeca
5th Period
Group 3
Gina, Timberly,
Jesse, Jasmine
Group 6
Mikell, Justin,
Breonne,
Chassidy
Group 9
Projector
Front Door
Group 2
Group 1
Natosha,
James, Ida,
Felix
Stephon, Paul,
Tyler, Chyna
Group 5
Rikki, Aujuan,
Jandolyn,
Breionna H.
Group 8
Qiana, De’Jonel,
Desman
Group 4
Mason, Brianna
M.M Nathan,
Mario
Group 7
Maghan,
Granville, J’Don,
Dominique
On to the real stuff!



GRAPHS AND CHARTS are ALL OVER the GEE and
ACT
Being able to interpret them is a skill you need to
DOMINATE these tests!
Many newspapers and magazines will put data in
different kinds of texts and you need to practice
how to read them!
Why do scientists use graphs?
To organize, compare, and
display experimental data
 To make calculations and
predictions

Old Notes on Graphing…

When looking at a graph, always
determine:
1.
2.
3.
What question was the scientist was trying
to answer?
What conclusions can be made from the
graph?
What future experiments could be done?
What the Chemistry Studs need to say
to Mr. LY’s Classes….
How to Graph (Copy steps down!)
Key Point #1: To graph…
 Label axes (x = IV, y = DV)
 Title graph (y-axis vs. x-axis)
 Determine scales (using data ranges)
 Plot each point (x,y)
 Draw trend line (line of best fit) (use a
ruler)
Review!

Valence electrons are…?
Electrons in the outermost
energy level
Graph One – Practice!

Number of Valence Electrons vs.
Family on the Periodic Table
What’s the x-axis?
What’s
the y-axis?
Let’s make a table of data first!
Valence Electrons vs. Family
Family on the Periodic Table
(x-axis)
Alkali Metals (1)
Alkaline Earth Metals (2)
Boron’s Group (13)
Number of Valence Electrons
(y-axis)
1
2
Carbon’s Group (14)
3
4
Nitrogen’s Group (15)
5
Oxygen’s Group (16)
6
Halogens (17)
7
8
Noble Gases
What is Atomic Size?

Atomic size is…
How big an atom is
Also known as atomic radius
radius
Graphing Atomic Size (Radii)

Draw 2 line graphs (one with Ms.
Stroh, one totally on your own!)
x-axis:
Element
y-axis: Atomic Radius (picometers)
Elements and their Atomic Radii
1 picometer = 1 x 10-12 m
1
Element
(x-axis)
Atomic Radius
(picometers)
2
Element
(x-axis)
(y-axis)
(y-axis)
Hydrogen
37
Lithium
152
Sodium
186
Potassium
227
Rubidium
248
Cesium
265
Atomic Radius
(picometers)
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Neon
152
112
85
77
75
73
72
71
How to make a good scale??
Determine the smallest and the biggest number in the data
set (data range)
1.

In Table 1, these numbers are 37 and 265
Count the number of lines available on graph paper
2.

In this case, we have???
Make a break if data is FAR AWAY from zero!
Divide the data range into even intervals
3.
4.


Go by 1s, 2s, 5s, 10s, 50s, 100s, etc…
You want numbers that can easily be divided into parts (halves,
thirds, fourths)
Atomic Size – Graph 1
Atomic Radius (picometer)
350
300
250
200
150
100
50
0
0
1H
Li
2
Na
3
K4
Element
Rb
5
Cs
6
7
Atomic Size – Graph 2
Atomic Radius (picometer)
160
140
120
100
80
60
40
20
0
0
Li
Be
2
B
4C
N
Element
O
6
F
Ne
8
10
What trend(s) do
you notice?
Atomic size DECREASES as you go left to right across the PT
Atomic size INCREAESES as you go down the PT
Atomic Size Trend
Key Point #2: Atomic size increases as
you go down the periodic table and
decreases as you go left to right across
the periodic table.
Practice Problems

Rank the following elements in order of
increasing atomic size based on location on
the periodic table (smallest to biggest)
Fr, Sc, P, Pd
P, Sc, Pd, Fr
F, As, Tl, S
Fluorine, Sulfur, Arsenic, Thallium
Practice Time!
1.
2.
3.
T or F? Atomic size decreases as you move right across
the periodic table.
T or F? As you move down the Periodic Table, atoms get
smaller.
Rank the following sets of elements in order of increasing
atomic size (small  big).
Set A: Bh, Mn, Re, Tc
Set C: Y, Ti, Sg, Ta
4.
Set B: Sb, I, Ag, Ru
Rank the following sets of elements in order of
decreasing atomic size (big  small).
Set A: Cl, At, I, F, Br
Set B: Te, Xe, Sn, In
Set C: Rb, K, Sr, Ca
Add to BACK of Homework Paper!
Copy the following
table onto your
paper and graph
the data 
 Use a ruler to make
straight axis lines!

Study Time
(minutes)
Score on Test
(Percentage)
10
33
22
46
35
61
67
85
93
95
Exit Question
1.
2.
3.
What is atomic radius?
Why does Phosphorus have a
larger atomic radius than Nitrogen?
Why does Fluorine have a smaller
atomic radius than Lithium?