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Scientific Method. By: Brianna Shields September 20, 2004. DO NOW. 1. The mass of a block is 14g, it’s volume is 56 cm^3. What is it’s density? Label with proper units!

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scientific method

Scientific Method

By:

Brianna Shields

September 20, 2004

do now
DO NOW
  • 1. The mass of a block is 14g, it’s volume is 56 cm^3. What is it’s density? Label with proper units!
  • 2. A block has a density of 44 g/cm^3. If it is broken into 4 equal pieces, what is the density of each individual piece?
  • 3. A block has a density of 0.89 g/cm^3. Will it sink or float when placed in water? EXPLAIN how you know that.
slide3
GOAL
  • To list the steps of the scientific method
  • To formulate a hypothesis and a conclusion
  • To examine an experiment and identify the variables, constants and control
the experiment
The experiment
  • We will learn how to carry out an experiment using the scientific method
  • Materials: 3 pots, dirt, water, seeds
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Steps

“Queen Harriet Eats Dead Cats”

1. Question

2. Hypothesis

3. Experiment

4. Data

5. Conclusion

Scientific Method
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1.

What you want to know or research

Ex:

How much water is best for plant growth?

Scientific Method
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2. Hypothesis

A prediction about what you think will happen

If (something is done), then (this will occur)

Ex:

If a plant is given a large amount of water, then it will grow the tallest

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3. Experiment

Independent Variable- the item you are changing or testing (one at a time)

Ex: Water

Dependent Variable- what is affected, the measured result

Ex: plant growth

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3. Experiment Parts

Procedure- what steps will you follow?

Ex:

3 pots- dirt in each

bury 4 seeds in each

add different amounts of water each day

measure the plant height

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3. Experiment Parts

Control- has no independent variable- ensures any results are due to only the I.V.

Ex: One pot gets no water

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3. Experiment Parts

Constants- each set-up should be treated exactly the same, except for the IV

Same sunlight

Same pot size

Same seed number

Same type of dirt

Same amount of dirt

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4. Data

Set- up a table to organize the info. You need

Ex: (copy ex. Off side board)

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5. Conclusion

A. What were your results? What did you find?

B. Was your hypothesis correct? Explain.

C. Any possible errors?

Ex:

Plant 3 got the most water and grew the tallest.

Scientific Method
do now14
DO NOW
  • 1. The mass of a foam block is 18g, it’s volume is 54 cm^3. What is it’s density?
  • 2. Will the foam block sink or float in water? Explain why
  • 3. Draw a picture of a cup of water with a foam block in it. Make sure you sketch the block in it’s exact location.
practice hypotheses
Practice: Hypotheses
  • Questions:
    • What type of household cleaner kills the most bacteria?
    • Why do some sugar crystals grow larger than others?
    • Frogs at the bottom of the Chadakoin river have been dying off although frogs at the top are perfectly healthy
practice hypotheses16
Practice: Hypotheses
  • What type of household cleaner kills the most bacteria?
  • If comet cleaner is used, then most of the bacteria will be killed
practice hypotheses17
Practice: Hypotheses
  • Why do some sugar crystals grow larger than others?
  • If more sugar is added, then larger crystals will grow
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Practice: Hypotheses
  • Frogs at the bottom of the Chadakoin river have been dying off although frogs at the top are perfectly healthy
  • If the water at the bottom is heavily polluted, then the frogs will die off.
indep and dep variables
Indep and Dep Variables
  • If comet cleaner is used, then most of the bacteria will be killed
  • If more sugar is added, then larger crystals will grow
  • If the water at the bottom is heavily polluted, then the frogs will die off.
indep and dep variables20
Indep and Dep Variables
  • If comet cleaner is used, then most of the bacteria will be killed
  • IV = type of cleaner
  • DV= amt of bacteria killed
indep and dep variables21
Indep and Dep Variables
  • If more sugar is added, then larger crystals will grow
  • IV = amount of sugar
  • DV= size of crystals
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Indep and Dep Variables
  • If the water at the bottom is heavily polluted, then the frogs will die off.
  • IV= amount of pollution
  • DV= frog survival
identifying constants
Identifying Constants
  • If we do an experiment to see whether the amount of sugar used affects the size of the crystal grown
  • What do we change?
    • Amount of sugar
  • What are some constants?
    • Amount of water, Water temperature, Time to grow, Type of container
identifying constants24
Identifying Constants
  • If we do an experiment to see whether certain cleaning products are better at killing bacteria
  • What do we change?
    • Type of cleaning product
  • What are some constants?
    • Amount of product used, Amount of starting bacteria, Tool used to apply product
identifying constants25
Identifying Constants
  • If we do an experiment to see whether different amounts of pollution affect frog survival
  • What do we change?
    • Amount of pollution
  • What are some constants?
    • Water temperature, Type of pollution, Type of frogs used
setting up a data table
Setting up a data table
  • Set up a data table to display information about an experiment on whether the amount of sugar used affects sugar crystal growth
setting up a data table27
Setting up a data table
  • Set up a data table to display information about an experiment on whether the amount of sugar used affects sugar crystal growth
conclusions
Conclusions
  • Use the data table to write a conclusion
  • The more sugar that is used, the larger the mass of the resulting sugar crystals
setting up experiments
Setting Up Experiments
  • Read over the “Reproduction and Development” Experiment. We will fill in the parts of the experiment together.
  • Look at “Living and Nonliving things”. Work on this experiment with a partner.
lab write ups
Lab Write-Ups
  • We will be doing many experiments in class. Use the handout to fill in a description of each part of a lab write-up.
  • You will keep this handout in the lab portion of your lab binder
purpose
Purpose
  • What is the purpose of the experiment? What is your hypothesis? What are your independent and dependent variables?
materials
Materials
  • List all the materials you will be using
procedure
Procedure
  • List all of the steps that you will follow
    • Number each step
data and observations
Data and Observations
  • Make a table to display the data you are collecting or the observations you are making
conclusions35
Conclusions
  • What are the results?
  • What did you find?
  • Was your hypothesis correct? Why or why not?
  • What are some possible errors?