Transcript September 9 - Anna Wu Photography

Seating Chart
Christine
Editivia
Julio
Oscar
Jessica
Raymond Wayne
Ryan
Mario
Odabi
Brian L
Jennifer
Brian P
Elizabeth Marcelus
Tiffany
Scott
Bernadette Rameen
Rocio Nehemiah
Jonathan Pascual
Back of Class
Daniella Michala
Millie
Jise
Alyson
Julien
Austin
Abbie
Eric
Hannah
Jansen
Chrystal
Windows
Door
Robert
Front of Class
Wednesday 9/9/09
Objectives:
SWBAT investigate the different types of
chemistry.
SWBAT identify well-formed, testable
hypotheses
Warm Up
Consider the following statements:
1. Ultraviolet light may cause skin cancer.
2. Ultraviolet light causes skin cancer.
3. If skin cancer is related to ultraviolet light, the
people with a high exposure to UV light will
have a higher frequency of skin cancer.
1. Which is a prediction? Or an inference?
2. Which of the following is a conclusion?
3. Which of the following would be the best
choice for a hypothesis, why? Explain
4. Finish the thought, “Chemistry is….”
Chemistry is not…
Always visible.
Dissections.
Radioactive fleas, well actually it could be.
Explosions.
Just math.
Chemistry is…








Everything you see
Everything you smell
Everything you touch and taste
The study of changes
The answer to many phenomena of nature
Experiments and combustion
Data and calculations
The study of matter and its properties
 Fun, interesting, and logical to me, and hopefully
eventually for you as well.
Current topics in chemistry
What type of cancer medications are being
produced? (medicine and biotechnology)
How will be solve this energy crisis?
(energy and thermochemistry)
How can we produce enough food to feed
the world? (agriculture)
Is it possible to sustain life on foreign
planets? (universe matter)
Different types of chemistry.
Organic chemistry vs. Inorganic chemistry
Analytical chemistry (blood tests)
Biochemistry (digestion)
Physical chemistry (physical properties
and changes)
Chemistry is an experimental science
Observations
What did we see, smell,
feel, notice?
What is the problem?
Hypothesis
What is the reason or
solution?
Is your hypothesis a good one?
All hypothesis are testable, if not they are
just predictions!
For example:
Ultraviolet light may cause skin cancer.
Ultraviolet light causes skin cancer.
If skin cancer is related to ultraviolet light,
the people with a high exposure to UV
light will have a higher frequency of skin
cancer.
Another example…
 If leaf color change is related to temperature,
then exposing plants to low temperatures will
result in changes of color.
Is it testable?
What are the variables?
Which to you control?
(independent?)
Which do you observe?
(dependent)
A Silly Example…
Yet again…
Is it testable?
The moon is made of green cheese.
Homework
1.
2.
3.
Observe something! (ex. Bubbles in soda, lumps in
milk, a Giants baseball game)
Ask a question:
Why are there so many bubbles in soda?
Why is milk lumpy sometimes?
How hard is it to hit a homerun?
Formulate a hypothesis to answer your question:
If the amount of bubbles is related to amount of soda, then
changing the amount will result in more or less bubbles.
If the distance a ball travels is related to size of the bat, then
changing the size of the bat will result in different distances
traveled by the ball.
DO THIS TWICE!
Sticky Situation
Directions:
Add 3 heaping tablespoons of fine powder to bag, then add 3
tablespoons of water.
Use the spoon to thoroughly stir the mixture. Let stand for a few 3-5
minutes.
Slowly push your finger into the mixture. Then repeat with your fist.
Quickly jab your finger into the mixture. Then repeat with your fist.
Take a handful of the mixture and form a ball. Squeeze and release
the ball several times.
Questions
What happened when you slowly pushed
your finger or fist into the mixture?
What happened when you jabbed your
finger or fist into the mixture?
What happened when you squeezed the
ball? When you released the ball?
What factors seems to determine whether
the mixture behaves like a solid or like a
liquid? (Write this as a hypothesis!)