Scientific Method

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# Scientific Method - PowerPoint PPT Presentation

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

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!
• 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.
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
• We will learn how to carry out an experiment using the scientific method
• Materials: 3 pots, dirt, water, seeds
Steps

1. Question

2. Hypothesis

3. Experiment

4. Data

5. Conclusion

Scientific Method
1.

What you want to know or research

Ex:

How much water is best for plant growth?

Scientific Method
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

Scientific Method
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

Scientific Method
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

Scientific Method
3. Experiment Parts

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

Ex: One pot gets no water

Scientific Method
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

Scientific Method
4. Data

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

Ex: (copy ex. Off side board)

Scientific Method
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 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
• 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: Hypotheses
• What type of household cleaner kills the most bacteria?
• If comet cleaner is used, then most of the bacteria will be killed
Practice: Hypotheses
• Why do some sugar crystals grow larger than others?
• If more sugar is added, then larger crystals will grow
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
• 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 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 Variables
• If more sugar is added, then larger crystals will grow
• IV = amount of sugar
• DV= size of crystals
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
• 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 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 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
• 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 table
• Set up a data table to display information about an experiment on whether the amount of sugar used affects sugar crystal growth
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
• 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
• 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
• What is the purpose of the experiment? What is your hypothesis? What are your independent and dependent variables?
Materials
• List all the materials you will be using
Procedure
• List all of the steps that you will follow
• Number each step
Data and Observations
• Make a table to display the data you are collecting or the observations you are making
Conclusions
• What are the results?
• What did you find?
• Was your hypothesis correct? Why or why not?
• What are some possible errors?