parts of the scientific method ask a question develop a hypothesis experiment analyze data reach...
TRANSCRIPT
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The Scientific Method
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Parts of the Scientific Method
Ask a Question
Develop a Hypothesis
Experiment
Analyze Data
Reach Conclusion
s
Form a Theory
Repeat
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Parts of the Scientific Method
Ask a Question
Develop a Hypothesis
Experiment
Analyze Data
Reach Conclusion
s
Form a Theory
1) Ask a Question
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Parts of the Scientific Method
1. Observe a Problem or Ask a Question
Example:Is fire always orange?
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Parts of the Scientific Method
Ask a Question
Develop a Hypothesis
Experiment
Analyze Data
Reach Conclusion
s
Form a Theory
2) Develop a Hypothesis
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Parts of the Scientific Method
2. Develop a Hypothesis
Example: If the same substance
(phlogiston) is emitted by fire, then all
fires will be orange.
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Parts of the Scientific Method
Ask a Question
Develop a Hypothesis
Experiment
Analyze Data
Reach Conclusion
s
Form a Theory
3) Experiment
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Parts of the Scientific Method
3. Experiment
Example:Burn metal chlorides and observe color of flame
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Parts of the Experiment
Independent Variable – the variable that is changed by the scientist
Dependent Variable – the variable that “depends on” the independent variable changing
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Parts of the Experiment
Control Variables – variables that are kept constant
Example:
Independent: Which metal is burned
Dependent: Color of flame
Control: Type of flame, temperature of
flame, etc.
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Parts of the Scientific Method
Ask a Question
Develop a Hypothesis
Experiment
Analyze Data
Reach Conclusion
s
Form a Theory
4) Analyze Data
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Parts of the Scientific Method4. Analyze Data
Metal Chloride Flame ColorCalcium Chloride
Strontium Chloride
Lithium Chloride
Potassium Chloride
Cupric Chloride
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Parts of the Experiment
Quantitative Data – data which can be measured; deals with numbers
Qualitative Data – data can be observed but not measured; deals with descriptions
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Parts of the Scientific Method
This data is Qualitative. It does not have numbers.
Metal Chloride Flame ColorCalcium Chloride Orange
Strontium Chloride Orange-red
Lithium Chloride Red-orange
Potassium Chloride Purple
Cupric Chloride Green
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Parts of the Scientific Method
Ask a Question
Develop a Hypothesis
Experiment
Analyze Data
Reach Conclusion
s
Form a Theory
5) Reach Conclusion
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Parts of the Scientific Method5. Reach Conclusion
Metal Chloride Flame ColorCalcium Chloride Orange
Strontium Chloride Orange-red
Lithium Chloride Red-orange
Potassium Chloride Purple
Cupric Chloride Green
Conclusion: Fire does not always burn orange.
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Parts of the Scientific Method
Ask a Question
Develop a Hypothesis
Experiment
Analyze Data
Reach Conclusion
s
Form a Theory
6) Form a Theory
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Parts of the Scientific Method6. Form a theory
Theory – an explanation for some phenomenon that is based on observation, experimentation, and reasoning-Must be supported by many experiments done by many scientistsThe theory of phlogiston (a substance that leaves materials when they burn) was proven false.
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Parts of the Experiment
Which is the independent variable?(variable changed by the scientist)
-Whenever Angela accidentally eats peanut butter, she becomes really sick.
1. Peanut Butter 2. Sickness
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Parts of the Experiment
Which is the independent variable?
-Julie wants to know if the amount of sunlight a plant receives will affect its growth.
1. Amount of sunlight2. Plant Growth
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Parts of the Experiment
Which is the independent variable?
-A university research group investigates the connection between developing lung cancer and smoking cigarettes.
1) Lung cancer 2) Smoking
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Parts of the Experiment
Is the data quantitative or qualitative?-Whenever Angela accidentally eats peanut butter, she becomes really sick.
1) Quantitative (numbers)2) Qualitative (descriptive)
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Parts of the Experiment
Is the data quantitative or qualitative?
-Julie wants to know if the amount of sunlight a plant receives will affect its growth.
1) Quantitative (numbers)2) Qualitative (descriptive)
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Parts of the Experiment
Is the data quantitative or qualitative?-A university research group discovers that 80%-90% of all lung cancer deaths are due to smoking.
1) Quantitative (numbers)2) Qualitative (descriptive)