Variables
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Variables

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Variables Variables Presentation Transcript

  • Review
    Warmup.
    What is a variable?
    What is made during photosynthesis?
    Where is there more oxygen, a lot of photosynthesis or a little.
  • A variable is any factor of an experiment that can be changed.
    What Kind of plant
    Water
    Bags
    Light
    Amount of Co2
    Variable
  • Three types of variables
    Control- What stays the same
    Manipulated_What you change before the experiment.
    Responding_The variable that is observed or measured.
  • What batter is the best?
    Put them in flashlights
    Turn on the flashlights
    Record how long each
    Flashlight stays on.
    Battery experiment
  • Battery Experiment
    Manipulated Variable
    Batteries
    Responding Variable (dependent variable)
    Length light stays on.
    Control variable
    Same flashlight
    Same time started
    Same temperature
  • Experiment 2
    What kind of coffee cup keeps coffee warmest.
    Look for
    Manipulated variable
    Control variables
    Responding variable
  • experiment
  • Manipulated Variables
    What was the manipulated variable?
    These are the variables you set up. What is different in the experiment
  • Responding variables
    What was the responding variable.
    The responding variable is what you observe.
    We observed the change in
    Temperature
  • Control variable
    What parts of the experiment were kept the same.
    Always use the same measuring
    devices.
    Same thermometer
    Same amount of water
    Same beginning temperature.
  • Amount of variables
    How many manipulated variables can we have?
    How come we can only have one?
    What happens if we had different batteries AND different flashlights, AND different temperatures they were tested in?
    Do we know which battery is truly better?
    Could have better flashlight
    Temperatures can make batteries last longer.
    YOU CAN ONLY HAVE ONE MANIPULATED VARIABLE AT A TIME.
    This is so you know what exactly is causing the dependent variable.
  • Elodea experiment.
  • You will do three experiments.
    For each experiment give:
        Hypothesis: What do you expect will give you the most photosynthesis?
        Manipulated Variable: Which Variable are you testing
        Control Variable: What variables are you keeping the
    same?
        Responding Variable: Bubbles
     
    Data table, 
    Do 4 tests with 4 different variables and record your data. 
    Conclusion
    How does this variable affect photosynthesis?, 
  • Elodea experiment.
  • Predictions? Hypothesis
    What color will work best?
    PlainRed Green Blue,
    What will happen when we increase CO2
    What will happen when we increase the light level?
  • Our Lab
    You will record Data Table.
    Change only one variable at a time. You then know this effect on the photosynthesis.
    You will do 4 runs for each variable.
    Test the effect of Light Level
    Test the effect of light color
    Test the effect of carbon dioxide
  • Results
    Chart your data.
    List the level of all the variables and the result