Troy

Week 3 4/23/09 This week in science i learned about matter.Also we got to do a lab and we had to use a magnifing glass to light matches i learned if you dont put the cap on right it will blow off. Then we did another lab where we got to use baking powder and seen the reactions and if you use the flask with a balloon and in the flask you put viniger and baking soda the balloon will fill up. The i learned more about the two states of matter like kenetic and potenial energy and the differences like kenetic energy is Energy of motion Electrical,thermal,sound,andmotion then potential is stored energy or energy of positions.

1. One thing i learned is about atomic mass and atomic numbers i used to not no the difference between the two. But now i do no and it helps me when we do Bohr models and study the periodic table. 2. I also learned what valence shells are, they are the outer shells of the Bohr models. 3. A question i had is why do we need a periodic table.