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# Scientific Method with Drops on a Penny Lab 6th grade

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## Jeanette Klette

on 25 October 2013

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#### Transcript of Scientific Method with Drops on a Penny Lab 6th grade

The Scientific Method
What is the Scientific Method???
The Scientific Method is the process that is used to find answers to questions about the world we live in.
Step 1:
Identify the problem
Step 2:
Form a Hypothesis
What do you think will happen? Predict the answer to your question or the outcome of the experiment.
What do you want to know or explain?
Step 3:
Create an Experiment
How will you test your hypothesis? Develop a procedure for a reliable experiment.
Use the observations you have made to write a question that addresses the problem or topic you want to investigate.
Step 4:
Determine your
Independent Variable
What part of the experiment will you change?
Step 5:
Step 6:
Collect the Data
Step 7:
Analyze the Data and Form a Conclusion
What did you learn? Write a conclusion that summarizes the important parts of your experiment and the results.
Mr. Krabs created a secret ingredient for a breath mint that he thinks will "cure" the bad breath people get from eating crabby patties at the Krusty Krab. He asked 100 customers with a history of bad breath to try his new breath mint. He had fifty customers (Group A) eat a breath mint after they finished eating a crabby patty. The other fifty (Group B) Also received a breath mint that did not have the secret ingredient. Both groups were told that they were getting the breath mint that would cure their bad breath. Two hours after eating the crabby patties, thirty customers in Group A and ten customers in Group B reported having better breath than they normally had after eating crabby patties.
SpongeBob noticed that his favorite pants were not as clean as they used to be. His friend Sandy told him that he should try using Clean-O detergent, a new brand of laundry soap she found at Sail-Mart. SongeBob made sure to wash one pair of pants in plain water and another pair in water with the Clean-O detergent. After washing both pairs of pants a total of three times, the pants washed in the Clean-O detergent did not appear to be any cleaner than the pants washed in plain water.
Cohesion
Water molecuels are attracted to other water molecules.
The oxygen end of water has a negative charge and the hydrogen end has a positive charge.
The hydrogens of one water molecule are attracted to the oxygen from other water molecules.
This attractive force is what gives water its cohesive properties.
Surface Tension
Surface tension is the name we give to the cohesion of water molecules at the surface of a body of water.
The cohesion of water molecules forms a suface "film" or "skin."
Some substances may reduce the cohesive force of water, which will reduce the strength of the surface "skin" of the water.
Drops On A Penny Lab
Part A: Control Test

Drops on a Penny Lab
Part B: Testing Liquid

Drops On A Penny Lab
Create a Hypothesis: How many drops of water can fit on one side of a penny?
Lab Review
An educated guess based on observations and your knowledge of the topic
Data is information gathered during an experiment
1.What was the problem SpongeBob wanted to investigate?

2. What is the independent variable?

3. What is the dependent variable?

4. What should SpongeBob's conclusion be?
Worksheets!
Instructions:

2. Follow along with the lesson and fill in the blanks.
Practice!!
Problem: In my class, who has the longest arms-boys or girls?
Take 5 minutes to gather your data
Were you right?
1. Which people are in the control group?

2. What is the independent variable?

3. What is the dependent variable?

4. What should Mr. Krab's conclusion be?

5. Why do you think 10 people in group B reported fresher breath?
Good Morning!

On a half sheet of paper answer the following questions:

1. What is cohesion? (Hint Micky Mouse Ears H2O)

2. What is surface tension? (Hint we had a demonstration in class using pepper to show it)
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