Tuesday, September 22, 2009
1. Warmup: Create a “KWL”- WATER
PURIFICATION: What do you know?
What do you want to know? Leave
the “L” blank for now.
2. Pg. 165 #6-9 discussed, due.
3. Notes: p.165#10-13
4. Safety Goggles
5. Begin lab p.756-9
6. Homework: Read Chapter 4 this
week, P.115#1-3 due tomorrow.
Page 165 #10-13 NOTES
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10. How could each of the following
atoms react to achieve a noble- gas
configuration?
– A. iodine.
– Info : I, #53, group 17.
– Answer: Iodine would need to gain an
electron, becoming an anion. I-
Page 165 #10-13 NOTES
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10. How could each of the following
atoms react to achieve a noble- gas
configuration?
– B. strontium
– Info: Sr, #38, Group 2
– Answer: strontium would lose two
electrons, becoming a cation, Sr +2
Page 165 #10-13 NOTES
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10. How could each of the following
atoms react to achieve a noble- gas
configuration?
– C. Nitrogen
– Info: N, # 7, group 15, 5 valence
electrons
– Answer: Nitrogen would acquire 3
electrons, becoming an anion, N-3
Pg. 165 #11
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Electron configurations…
Orbitals, energy levels, s,p,d,f,g
Beryllium, oxygen
Electron spins
Tuesday, September 22, 2009
1. Warmup: Create a “KWL”- WATER
PURIFICATION: What do you know?
What do you want to know? Leave
the “L” blank for now.
2. Criminalistics p.167-8 #1-33 due
3. Magnetic Field Lines Lab is due
4. Homework due Thursday: p.626
Physical Science Book, #35
5. Notes p. 541-553 (PHYSICS book)
due in binder Thurs.
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PLEASE QUIETLY LISTEN TO THE
ANNOUNCEMENTS…
Notes p.541-53, PHYSICS
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Chapter 20 : Static Electricity
Electrostatics: the study of electric
charges that can be collected and held
in one place.
Key Words: electrostatics, neutral,
insulator, conductor
Like charges repel; opposite charges
attract
Notes p.541-53, PHYSICS
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Static electricity can be produced by
conduction, induction, and friction.
FRICTION: two objects rub against
each other- there is a transfer of
electrons
CONDUCTION: a charged object
touches a conductor; there is a
transfer of electrons
examples
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FRICTION: rub balloons with fur; rub
hair with balloon; shuffle feet across
the carpet
CONDUCTION: A person with a static
charge touches a friend and they get a
SHOCK; a charged balloon touches foil
on an electroscope
induction
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INDUCTION- When a charged object
comes NEAR another object, causing a
displacement of electrons
Excess charge can be transferred out
of the opposite end of the object …
A diagram follows.
Page 544- PHYSICS
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MICROSCOPIC VIEW OF CHARGE
When the atom has the same number of
protons and electrons, it is NEUTRAL
CONDUCTORS easily surrender their
electrons. Metals are good conductors.
INSULATORS do not easily surrender their
electrons; wood is a good insulator.
SEPARATION OF CHARGE
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Another way of visualizing transfer of
static electricity
Induction: positive and negative charges
are separated within an object, but not
transferred beyond the object
Conduction and Friction: charges are first
separated, then transferred
Tuesday, September 22, 2009
1.
2.
3.
4.
5.
6.
Warmup: What are some PROPERTIES of
water?
HW due- answers to yesterday’s lab
safety q’s
Quick Lab: Observations
Discuss: Properties. Define chemical
and physical properties, give examples
Begin density lab
Homework Frayer Models for each of
10 vocab words, due Thurs.
Warmup: Properties of Water
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Liquid
Clear
Drink it
Sometimes salty
Part of the environment
In food
No taste/ “nasty”
Natural
Can swim in it-fish, people
Bubbles
Can make things with it
Can wash in it
H2O
Grow plants
Keep hydrate
Has minerals
QUICK LAB: observations
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What characteristics/ categories can
we observe?
As a class: construct a table
Complete the table
Due today
QuickLab: Observations
Physical Property
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Definition:
Examples:
Chemical Property
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Definition:
Examples:
Begin Density Lab
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What is density?
How is it calculated?
What is the density of water?
How can we find the density of a
bowling ball?
Vocabulary Words
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Density
Mass
Volume
Physical property
Chemical property
Weight
Mixture
Compound atom
molecule
Frayer Model