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Intro to Chemistry & the Scientific

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Presentation on theme: "Intro to Chemistry & the Scientific"— Presentation transcript:

1 Intro to Chemistry & the Scientific
Method

2 Chemistry- study of the composition of matter and the changes that matter undergoes

3 Organic Physical Inorganic Analytical Biochemistry

4 Scientific Method 5 Steps: 1. Problem 2. Hypothesis 3. Experiment
4. Observations & Data 5. Conclusion

5 1) Problem - “What’s wrong?”

6 2) Hypothesis - “Educated Guess”
predict what will happen based on prior knowledge

7 3) Experiment - Test your hypothesis
a) Control Group – stays the same, used for comparison b) Variable Group – what you manipulate that changes

8 1. Independent Variable – what the experimenter changes (what I change
2. Dependent Variable – what is observed/measured (dependent variable depends on the independent variable).

9 3. Control Variables – Things that are kept the same during each experiment.
Remember, a good experiment only has two variables that change (independent and dependent). All the rest of the variables must be the same.

10 when graphing… Keep in mind: D R Y M I X dependent independent

11 4) Observations & Data collection

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13 5) Conclusion - - Based on observations Might support hypothesis!

14 Observation vs. Inference
Observation – the act of gathering information. You actually see it! Inference – an opinion based on the observations.

15 observation inference observation inference inference inference observation inference

16 Quantitative vs. Qualitative
- Qualitative – describes physical characteristics Color, Odor, Shape, Sound, Taste, Texture, Etc… Quantitative – numerical information How Much? How Tall? How Fast? How Many? Etc…

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19 Scientific Law vs. Theory
Scientific Law – summarizing statement of many experiments Has been proven, usually stated in a mathematical formula - Scientific Theory – thoroughly tested explanation of why experiments give certain results Can NOT be proven, helps predict natural systems

20 EX: Atomic Theory Charles Law


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