Transcript P3 T U - lhornec2e

Conducting Solutions
Sciences Fair
2009
Big Question
What solution
best conducts
electricity?
Hypothesis
The solution with more ions
will conduct the most
electricity than the
solution with fewer ions.
Interesting Facts
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The salt water, vinegar,bleach, pickle
juice, and baking soda all had the same
brightness on the light bulb with and
without the resistor.
The brightness never changed when I took
out the resistor.
When I added all of them together the
brightness of the bulb was really bright.
When I added more salt, the light got
brighter.
When I added all the solutions together,
the bleach turned it all a yellow-white
color from a brown color.
Materials
1) LED light bulb
2) 8 styrofoam cups
3) wire cutters
4) 9 volt battery
5) 9 volt battery connector
6) Resistor
7) 2 of the same size paper clips
8) electrical tape
9) solder iron
4
Procedure; Step #1
Strip the ends of the red and
black wires and bend the
paper clips so that they are
completely open except for 1
end (should look like a
fishing hook).
Procedure; Step #2
Put the 9 volt battery
connector on the battery.
Procedure; Step #3
Use the solder iron to melt
the the red wire on the
connector to the resistor
and the other end of the
resistor to the red wire on
the LED light bulb.
Procedure; Step #4
Then cut 2 pieces of
electrical tape and use 1
piece to tape the black wire
(on the 9 volt battery
connector) to the shorter
side of 1 paper clip and the
other black wire (on the LED
light bulb) to the shorter
side of the other paper
clip.
Procedure; Step #5
Then stick the other piece of
electrical tape to the 2
longer ends paperclips (in
the middle).
Procedure; Step #6
Label all the cups and Fill 1
cup with 100 ml of distilled
water. If wanted take out
the resistor after you have
completed the experiment the
firs time.
Procedure; Step #7
Insert paper clips in the
solution.
Procedure; Step #8
See how bright the light bulb
is and record data.
Procedure; Step #9
Fill the cup with 100 ml of
tap water and repeat steps 7
and 8.
Procedure; Step #10
Fill cup with 100 ml of
distilled water and 5g of
salt and repeat steps 7 and
8.
Procedure; Step #11
Fill cup with 100 ml of vinegar
and repeat steps 7 and 8.
Procedure; Step #12
Fill cup with 100 ml of bleach
and repeat steps 7 and 8.
Procedure; Step #13
Fill cup with 100 ml of pickle
juice and repeat steps 7 and
8.
Procedure; Step #14
Fill cup with 100 ml of
distilled water and 5g of
sand and repeat steps 7 and
8.
Procedure; Step #15
Fill cup with 100 ml of
distilled water and 5g of
baking soda and repeat steps
7 and 8.
Control/Variables

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Had to change my procedure 3
times.
Could have put more or less
water and mixture in the
cups.
Observations
When I added more salt, the light got
brighter.
The brightness never changed when I took
out the resistor.
The salt water, vinegar,bleach, pickle
juice, and baking soda all had the same
brightness on the light bulb with and
without the resistor.
When I added all of them together the
brightness of the bulb was really bright.
Data
Solutions
W/ 1K
resistor
Light Bulb
Brightness
No resistor
Light Bulb
Brightness
Distilled
Nothing
Nothing
Tap
Dim
Dim
Salt
Medium
Medium
Vinegar
Medium
Medium
Bleach
Medium
Medium
Pickle
Juice
Medium
Medium
Sand
Nothing
Nothing
Baking soda
Medium
Medium
Analysis
The experiment tested my hypothesis.
I know this because when I tested
the distilled water, the light bulb
didn't go on at all and when I
tested the tap water, the light
went on a little so that means that
there was a different amount of
ions in the solutions.
Conclusion
My hypothesis was correct because salt,
vinegar, bleach, pickle juice,and baking
soda had more ions than tap water and
distilled water.
I would have liked to change what I did
for the science fair because it was
really hard to find information about my
topic.
I don't really have any new questions but
I was wondering why it was so hard to
get my experiment to work right after I
got all the information I needed.
References
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fofweb.com/Science/LowerFrame.asp?S
ID=5&iPin=EOc1876&SingleRecord=True
.
Gardner, Robert Electricity and
Magnetism Science Fair Projects.
Berkeley Heights, NJ: Enslow
Publishers, Inc., 2004
Gardner, Robert Electricity and
Magnetism. Berkeley Heights, NJ:
Enslow Publishers, Inc.,2009
wwwchem.csustan.edu/CHEM2000/EXP6/e
xp6a.htm