6th

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6th

• Please be in your seat ready to go when the bell
  rings
• We will start the quiz after a short review

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Chapter 1The Nature of Science
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Chapter 1 Vocabulary

• Science
• Technology
• Scientific theory
• Variable
• Mass

• Volume
• Weight
• Scientific Notation
• Precision
• Accuracy

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What is the purpose of science?

• To investigate questions
• To support or refute a theory
• To gain knowledge

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Science is a system of knowledge based on facts
or principlesTechnology is the application of
science to meet human needs
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Theories Laws

• Theory? A tested, possible explanation of a
  natural event.

• Law? a summary of an observed natural event
• (a repeated observation about nature)

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• A theory must pass 3 tests
• A theory must explain observations simply
  clearly
• 2. A theory must be repeatable
• 3. Scientists must be able to predict from a
  theory

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Qualitative vs. Quantitative

• Qualitative

• Quantitative

• Describes data using words
• Quality
• Ex. There are many red cars in the parking lot

• Describes data with numbers
• Quantity
• Ex. There are 14 cars in the parking lot

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The Scientific Method

• What is it used for?
• Who can use it?

• State the Question
• Form A Hypothesis
• Test the Hypothesis
• Observe/Collect Data
• Draw a Conclusion

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Experiments

• How many variables are in a typical experiment?
• How many variables can be tested at one time?

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The main parts of an experiment

• Independent Variable
• Dependent Variable (result)
• Control

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Determine the variables in the experiment

• A botanist is studying the affect of fertilizer
  on pea plants.
• She test 5 plants. She adds 6 oz of fertilizer to
  plant 1, 7 oz of fertilizer to plant 2, 8 oz to
  plant 3, 9 oz to plant 4 and no fertilizer to
  plant 5. She waters each of the plants with 200mL
  of water everyday for 2 weeks and places them in
  the sun for 3 hours each day.

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The Metric System

• The International System of Measurement (SI
  units)

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Metric Conversions

• K H D B D C M

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Practice Problems

• 550 mm ________m
• 1.6 kg ________g
• 2800mmol ________mol

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Organizing Data

• There are 3 main types of graphs
• Bar
• Line
• Pie

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Scientific Notation

• A value written as a simple number multiplied by
  a power of 10.
• Shortcut If you move the decimal right the
  exponent is negative
• If you move it to the left the exponent is
  positive

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Practice

• 800 000 000 m
• 0.0015 kg
• 60 200 L

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Using Scientific Notation

• When you multiply, you add the exponents
• When you divide, you subtract the exponents

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Significant Digits (Figures)

• The digits in a measurement that are known for
  certainty.
• 1.638
• 1638
• 1.6