Matter, Measurement, and Data Analysis

1
Matter, Measurement, and Data Analysis

• UNIT ONE
• Chapters 1-3

2
What is Chemistry?Data Analysis

• Chapter 1

3
What is Chemistry?

• Chemistry is the study of matter and the changes
  it undergoes.

4
What is Chemistry?
5
What is Chemistry?
6
Observation vs. Interpretation

• Observation
• Interpretation
• Qualitative -
• Quantitative -

7
Match Candle LabPost-Lab

• Mass vs. Weight
• Loss of Mass?
• Observation vs. Interpretation (next slide)

8
Statements from Candle Lab

• The flame is centered on the wick.
• The flame is blue at the bottom, orange in the
  middle and yellow at the top.
• The flame uses oxygen from the air.
• Smoke (carbon) is released into the air.
• The flame melts the was.
• The flame is about 3 cm high.
• The diameter of the candle is about the same as
  my thumb.

9
Statements from Candle Lab

• 8. The flame gives off light.
• 9. The light of the flame is easily seen in a
  well-lighted room
• 10. There is a slight breeze in the room.
• 11. The flame flickers.
• The flame moves because of the air movement
  around the candle.
• Mass was lost because CO2 and H2O were formed.

10
Ozone Formation and Depletion

• Ozone Formation
• Formed in upper regions of the stratosphere
• Forms over equator
• Rxn 1
• Rxn 2

UV radiation
11
Ozone Formation and Depletion

• Ozone Depletion

• CFCs - Chlorofluorocarbons
• Chemistry
• Non-toxic
• Stable
• Uses
• Coolants
• plastic foams
• aerosol propellants

UV radiation
F
F
Cl
Cl
F
Cl
F
Cl
Cl
Cl
Cl
MYTH Ozone hole
12
Lab Safety

• See text book pg. ____

13
Scientific Method
14
Scientific Method
15
Scientific Method
Theory vs. law
16
Variables

• Dependent
• Independent
• Determine the dependent variable in each of the
  following
• The solubility of salt is determined at various
  temperatures.
• The size of a balloon is measured as the amount
  of air in it is changed.
• An enzymatically catalyzed reaction is run at
  various pH levels. The reaction rate is measured
  at each pH.
• Volume and Temperature of a gas.