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Tuesday April 3, 2012

Tuesday April 3, 2012. (TAKS Rotation Day 2 Chemistry). Bell Ringer Monday, 4-2-12. No Bell Ringers this week! Please pick up your TAKS Packet on your way in. Announcements. I will not be available this afternoon after school. Lab Exercise 4A.

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Tuesday April 3, 2012

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  1. TuesdayApril 3, 2012 (TAKS Rotation Day 2 Chemistry)

  2. Bell RingerMonday, 4-2-12 No Bell Ringers this week!Please pick up your TAKS Packet on your way in.

  3. Announcements • I will not be available this afternoon after school.

  4. Lab Exercise 4A Question 3 - Chemical Change Cards: A, E, G, M, N, O, S, X Physical Change Cards: B, D, F, H, I, Q, U Cards that may be argued to be physical or chemical: I, T Question 4 - I- Dog chewing on a bone: physical- gnawing on the bone, moving it into his mouth from the floor; chemical- the act of digestion from enzymes in the dog’s mouth.T- Straight Hair to Curly Hair: physical- the woman simply used a curling iron and her hair will return to being straight; chemical- the woman had a chemical treatment on her hair make it permanently curly. Question 5 - Chemical changes are different from physical changes because when something chemically changes it produces a new substance completely. Question 6 - Chemical changes are similar to physical changes in that a change occurs in either instance- how to decide if it was a chemical or physical change would be to figure out if it was a change that produced a new substance.

  5. TAKS Rotation Day 2 Chemistry Labs 4D – Elements, Mixtures, and Compounds (page 10) 10A – Structure and Function of Water (page 25)

  6. Focus Question 4D An example of a mixture is saltwater. An example of a compound is water. Saltwater is a mixture of two different compounds existing together in the same container but not chemically bonded together. A mixture doesn’t have a definite chemical composition or formula. Saltwater is a strong conductor of electricity. Water is a single compound with a definite chemical composition or formula. Pure water is not a strong conductor of electricity. Both saltwater and water exist as liquids at room temperatures. Focus Question 10A Water is a molecule with a high polarity, which means it has a positive and negative end because of unequally shared electrons. Water’s high polarity allows it to dissolve many other polar and ionic compounds. Water is the universal solvent.

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