Seating Chart Windows Door Back of Class Front of Class EricHannah ChrystalJansen AlysonJulien AbbieAustin Daniella Michala JiseMillie RocioNehemiah PascualJonathan ScottTiffany RameenBernadette JenniferBrian P MarcelusElizabeth RyanMario Brian LOdabi JessicaOscar WayneRaymond RobertChristine JulioEditivia

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 Hypothesis What did we see, smell, feel, notice? What is the problem? 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.Observe something! (ex. Bubbles in soda, lumps in milk, a Giants baseball game) 2.Ask a question: Why are there so many bubbles in soda? Why is milk lumpy sometimes? How hard is it to hit a homerun? 3.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!)