Measurements and Calculations Chapter 2

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Measurements and CalculationsChapter 2

• 2.1 The Scientific Method

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Scientific Method

• Scientific Method logical approach to solving
  problems by observing and collecting data,
  formulating hypotheses, testing hypotheses, and
  formulating theories that are supported by data

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Scientific Method

• System a specific portion of matter in a given
  region of space that has been selected for study
  during an experiment or observation
• Formulating Hypotheses
• Hypothesis testable statement in the if-then
  format

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Scientific Method

• Testing Hypotheses
• Using controls and variables
• Not proven, just supported
• Theorizing
• Model explains how phenomena occur how data
  or events r related
• Theory broad generalization to explain a body
  of facts or phonomena

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The Problem

• Observed Problem Alka Seltzer tablets do not
  dissolve quickly enough
• System to be studied There are 2 tablets and
  500 mL of water.
• Data collected The tablets weigh 7.0 grams. At
  r.t. it takes 5 min to dissolve.
• Hypothesis If __________________, then the
  tablet will dissolve quicker.

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Solve It!

• Testing Hypothesis
• What are your controls and variables?
  __________________________________
• What are your procedures? ________________________
  ______________
• Was your hypothesis supported? ____
• Theory can you make a theory to explain your
  observed results? ________________________________