September 2, 2009

Chapters 1 & 2 Test
Answers to Monday's test:

Dr. Bautista: Griff had some trouble getting this to post yesterday so you guys can comment on this one or tonights posting!

1. periodic chart*
2. glue gun melts a glue stick
3. 3
4. 19.3 g/cm^3
5. g/m^2
6. 91.4 cm
7. 4.05 g
8. centimeter
9. 10,080 min.
10. equation graphs as a straight line
11. meter
12. vitamin C (absorbic acid)
13. the smallest unit of matter that maintains its chemical identity
14. 0.036 g.
15. 3
16. 4.3 x 10^-7
17. 9.30 x 10^-3
18. to gain knowledge
19. 4.5 g
20. millimeter
21. discarding data inconsistent with the hypothesis
22. any substance that has a definite composition
23. compound*
24. 1.246 x 10^8
25. precise, but not accurate
26. melting
27. salt crystals formed as the liquid evaporated
28. 0.202 g
29. brittle
30. long after the basis resaerch is complete
31. liquid
32. 4.1 cm^3
33. density
34. volume

1* If you answered "None of the above", and it would change your quarter grade, see Dr. Bautista at the end of the quarter and she may change it. 23* Compound is the answer given by the book but Dr. Bautista said it could be "element" so this question didn't count for anyone.

NOTES

Foundations of Atomic Theory:

- The transformation of a substance or substances into one or more new substances is called a chemical reaction

3 Laws:

The Law of Consecutive Mass

- Mass is neither created nor destroyed during ordinary chemical reactions or physical changes.

The Law of Definite Proportions

- A chemical compound contains the same elemens in exactly the same proportions by mass regardless of the size of the sample or source of the compound.

The Law of Multiple Proportions

- If 2 or more different compunds are composed of the same 2 elements, then the ratio of the masses of the 2nd element combined with a certain mass of the 1st element is always a ratio of small whole numbers.

P.S. -Our first lab will most likely be at the end of next week