Class Notes 8/27/13
- Grab handouts on variables and experimental design and on substances from the table.
Questions of the Day
- What did you think of the observation lab? What did you learn from it?
- What were the three kinds of variables we talked about yesterday?
- How do chemists classify matter?
Reactions to the Observation Lab
- “It was very interesting”
- “It was a lot of fun”
- Purpose was to learn about how experiments are to be done in this class and to learn about the experimental process
Review of Variables
“Independent Variable
- What I change (As experimenter)
Dependent Variable
- Data
- What I observe and measure
- Qualitative Observations
- No numbers
- Quantitative Observations
- Has numbers and measurements
Controlled Variable
- Everything you try to keep the same from trial to trial”
- Danny Shiller
Classifying Matter
Pure Substances
Elements 
- 110 of these.
- Can’t be broken down.
- All atoms of an element are identical.
Compounds
- Different elements that are combined chemically
Mixtures
Homogeneous
- Same throughout
Heterogeneous
- Different throughout
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