Sunscreen Experiment
Standard: ALEX (3RD Grade) - 3.) Describe ways energy
from the sun is used.
Examples: plant growth, light, heat
• Identifying fossil fuels as a source of energy
FOCUS QUESTION* (Big Idea)
What do you have to investigate or figure out in this lesson
that is related to the big idea?
What will be the main question that will guide your learning?
Why do we wear sunscreen? How do
you think sunscreen protects our skin? Does it completely protect our skin?
PREDICTION/ HYPOTHESIS*
What do you think will happen (USING PRIOR KNOWLEDGE)
If I do … then… will happen because…
I think … because
I think the sunscreen with more
SPF will show as more protective for our skin.
PLANNING
• Lists
the materials
•
Describe in simple steps you take so someone else can repeat the experiment
& get the same results
1 Sheet of 81/2” x 11 clear plastic acetate
Black permanent marker
Three “protection levels” of sunscreen SPF 0, 8, 15
and 45.
Photoreactive paper
Plain cookie sheet
9x13 Pyrex dish of water
1.) Explain to students that they will be looking at what is really
happening when they smooth sunscreen onto their skin.
2.) Take the clear plastic sheet. Draw a straight line vertically
and horizontally through the middle of the sheet making four different “panes”.
Mark one SPF 0, another SPF 8, then SPF 15, and finally SPF 45.
3.) Measure about ¼ teaspoon of each kind of lotion and use your
finger to smooth it carefully over its appropriate “pane” on your plastic.
(Remember one pane will have no sunscreen at all).
4.) Quickly remove four pieces of photoreactive paper from their
protective envelope, place them on the cookie sheet, and then cover them
immediately with the plastic sheet you just prepared.
5.) Place the cookie sheet in full sun, with no parts shaded, and
leave it there for 1-4 minutes, or until the SPF 0 pane looks nearly white.
6.) Bring sheets inside, carefully take the plastic sheets off, and
use your marker to write its correct SPF. Then rinse the papers in the water
tray and remove to observe.
DATA*
Record the data in a way that will make sense to you later:
Paragraph, Bullets, Table/Chart, Drawings, Graphs, etc.
Title and label diagrams and pictures
Predictions
|
Results
|
|
SPF 0
|
There will be
no protection because there is no sunscreen.
|
This one had
the most exposure to the sun. It turned white as the sun hit it.
|
SPF 8
|
This one will
be the least protective besides no sunscreen.
|
This one
looked white, but it looked like water. It might not protect us for as long
because it looks thin.
|
SPF 15
|
This will be
the second best sunscreen to protect our skin.
|
This one was
the whitest. It looked thicker than the others and had less blue coloring
showing through the sunscreen.
|
SPF 45
|
This will be
the best protection for our skin.
|
This one
showed the color blue all over and less white.
|
CLAIMS AND EVIDENCE*
State your claim based on your evidence (data collected from
observations)
What do you claim to be true?
How can you prove what you are stating? (Back it up)
I claim that when ………, then ……….. (happens)….
I know this to be true because I observed………
I claim that the higher the SPF,
the less we see the color of the paper change to white. I know this to be true
because I observed the sun changing the color of the paper more with lower SPF.
CONCLUSION*
**Restate the focus question as a topic sentence
In this investigation…
In this inquiry….
I (we) learned that…..
Use details from your claims and evidence (data) chart to answer
the focus question.
**Every claim must be supported by evidence.
I (we) liked/did not like…… because
My (our) prediction that…..was…..because….
This reminds me (us) of….. because….
I (we) discovered that…..
Now I (we) think that….because
**Refer back to your hypothesis
My hypothesis was correct/incorrect because…
**Record your thoughts after the experiment
(Understandings, Likes, Related Thinking, Connections)
**Include a summative sentence that can be a restatement in
different words of the topic sentence.
**QUESTIONS: What new
questions do you have to extend your learning?
Does a swimsuit
or shirt that we wear outside work better than sunscreen? If we were to use
tanning oil/baby oil instead of sunscreen, how would that affect our skin
differently? Claim &
Evidence:
We claim that SPF 15 had the most protection from the UV rays because
it had the most white.
Conclusion:
We learned that the higher the SPF does not mean the more protection
from the sun.
Questions:
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