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Candy Bar Lab

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               BREAK ME OFF A PIECE…WILL IT SINK OR FLOAT???
The purpose of this lab is for you to make accurate predictions as to whether or not matter will float.
What determines the answer to this question is the density of the material being tested. The density of
water is 1 gram per milliliter. In other words, one milliliter of water has a weight of approximately one
gram.

You will be calculating the density, (using the correct number of significant digits, of course) to
determine whether or not certain candy bars will float when placed in water.

                   IMPORTANT: DO NOT EAT CANDY BARS UNTIL THE END OF
                      THE EXPERIMENT. YOU CANNOT HAVE ANOTHER!!!!

Materials:
One snickers bar                       One Kit-Kat Bar                        Cup of water
One 3-musketeer bar                    Balance                                Plastic knife

Procedure:
1. Unwrap the first candy bar. Using the triple-beam balance, find its mass. Record results.
2. Find the volume of the candy bar by measuring as accurately as possible with a ruler. Record results.
3. Calculate the density of the candy bar.
4. Predict whether the candy bar will sink or float.
5. Drop candy bar in a cup of water to test your hypothesis.
6. Cut the candy bar in half and draw what you see.
7. Eat candy if desired.

Special directions for Kit-Kat Bar:
1. Follow steps 1-3.
2. Break bar in half. Find the mass, volume and density for each half.
3. Follow steps 4-7.

Observations/Data:

SNICKERS BAR                          THREE MUSKETEERS                       KIT-KAT (whole)
Mass=                                 Mass=                                  Mass=
Volume =                              Volume =                               Volume=
Density=                              Density=                               Density=


SINK / FLOAT                          SINK / FLOAT                           SINK / FLOAT


Drawings:
KIT-KAT (side 1)                            KIT-KAT (side 2)
Mass=                                       Mass=
Volume =                                    Volume =
Density=                                    Density=


SINK / FLOAT                                SINK / FLOAT


Drawings:


Conclusions:

1. Based on your observations, what causes the difference in the density of the Snickers and Three
Musketeers Bar?




2. What was the density of the WHOLE Kit-Kat bar as compared to the two pieces? Why?




3. Assume that the expected density of the whole Kit-Kat bar is .86 g/cm3. Calculate the percent error.




4. Use the electronic scale in the front of the room to get the actually weight of the Three Musketeers
bar (if you ate yours, there is one up front that you can USE, NOT eat.) recalculate the density of the
Three Musketeers bar, using this measurement. How do the measurements compare? Why?




5. You find 2 rocks in your backyard and wonder if they are made of the same material. Design a
simple experiment that you could do to prove or disprove your hypothesis. Write this in enough detail
that a sixth grader could carry out your procedure.

				
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posted:11/18/2011
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