Lab Safety, MicroScope and Scientific Method

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Lab Safety, MicroScope and Scientific Method
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• Cells Under the Microscope p. 50
• Discovery
• 1. microscope-

micro-
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• 2. Robert Hooke-

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• B. Measuring cells
• 1. Based on SI units-
• 2. Metric Units (chart p. 50)
• a. kilometer-
• b. meter-
• c. centimeter-
• d. millimeter-
• e. micrometer-
• f. nanometer-

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II. Characteristics of Microscopes (pg. 51)

• A. Magnification
• B. Resolution-
• C. Total Magnification-

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III. Types of Microscopes p. 52

• A. Compound light microscope -

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• B. Electron scope - p.53

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Electronmicrographs
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Electron Microscope
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IV. Scientific Processes p. 14

• A. Scientific Method
• Step 1. identify the PROBLEM
  observations
• -example Why are amphibians disappearing
  from the lakes?

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• Step 2. Form a HYPOTHESIS
• a. Inference prior knowledge
• b. MUST be repeatable and testable
• c. If, then statement
• example acid rain is causing the amphibian
  population to decrease in the lake habitats
• If acid rain is causing the pH to drop, then
  the amphibian population will decrease.

OR
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• Step 3. Controlled EXPERIMENT
• a. control- only one
• example pH levels only, look at
  salamanders that hatch
• b. variable- changeable
• i. independent variable- that is
  changed (if)
• example Acid (pH) levelif the pH is low
• ii. dependent variable- measured,
  response (then)
• example number of salamanders hatched then
  the population will decrease

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• c. Record data-
• i. Quantitative- numbers
• ii. Qualitative- characteristics
• d. Reasoning-
• i. deductive reasoning decrease
• example all salamanders are affected by
  low pH, then so are salamanders in Colorado
• ii. Inductive reasoning increase
• example Colorado salamanders are affected
  by low pH, therefore all salamanders are
  affected

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• Step 4. Confirm predictions analyze data
• a. communicate findings
• b. charts, tables and graphs
• Step 5. Conclusion
• a. Was my hypothesis correct ?
• i. Yes, support it
• ii. No, change it
• example Yes, acid produced from polluted,
  melting snow, did harm the salamander embryos.
  (pg 16)

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• B. Theory or Hypothesis
• 1. Theory- proven multiple times
• example Cell phone radiation
• 2. Hypothesis- might be true
• example Cell phone radiation causes cancer