Parts of an Experiment Review

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Parts of an Experiment Review
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An Experiment
A controlled test or investigation
People do experiments to learn about the physical
world or to test theories.
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The purpose of an experiment is to solve a
problem.
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In every experiment there are..
Constants
Variables
Conditions that stay the same throughout the
experiment
Conditions that change during the experiment
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Experiments

• Test only one variable at a time.
• This allows you to measure the affect of that
  single variable.
• Ex
• Every factor except that variable should be
  constant

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Experiments

• Are always done more than once
• Proves the results
• Other scientists repeat experiment

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Every experiment has 2 variables
Independent variable
Dependent variable
The result of the lab. Is a factor that you
measure, but cannot control
The factor that you control
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Purpose Why is this lab this lab being
performed? What is the objective of the lab?
What are you trying to test? Hypothesis What do
you expect for an outcome of this lab? Expected
outcome of experiment
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Independent variable What variable did you
control during the experiment? Dependent
variable What variable was measured or observed
during the lab? Constants What stays the same
during a lab?
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Procedure What were all the steps taken to
complete the lab? Data What events or
measurements were observed in the
lab? Conclusion What were the results of the
lab? Was your hypothesis correct? Explain why or
why not.
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Ex How your type of shoe affect how fast you can
run?
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Ex How does hot water affect how fast sugar
dissolves?
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Water Temperature Lab

• State Problem How does the temperature of water
  affect the amount of time salt takes to dissolve
• Your Hypothesis Hot water dissolves salt faster
• Independent Variable Water Temperature
• Dependent Variable Time it takes to dissolve
• Constants amount of water, size of beaker, size
  of salt particle, amount of salt, amount of
  stirring

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Procedure
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Procedure

• Collect the materials necessary to complete the
  lab
• Fill the beaker with 100 ml of hot water
• Place 1 scoop full of table salt in beaker
• Record the time it takes to dissolve
• Dispose of salt water, clean out beaker
• Fill the beaker with 100 ml of cold water
• Place 1 scoop full of table salt in beaker
• Record the time it takes to dissolve
• Dispose of salt water, clean out beaker