Chemistry Lab: Percentage Composition
November 14, 2007
Percentage Composition Laboratory
Hypothesis: I
believe that chewing gum is _______% sugar.
(record the flavor
of the stick of gum)
Procedures:
1) Get a
stick of gum from your teacher. Remove the paper wrapper and dispose of
properly.
2) Weigh
the stick of gum in the foil wrapper. Be sure to retain the foil, later. Record
the weight of the gum in the wrapper in the data table.
3) We will
go outside to chew the gum. Retain the wrapper to put the chewed gum back into
to weigh.
4) When
finished chewing the gum, on more flavor, put the chewed gum lightly on the
foil wrapper and return to class.
5) Weigh
the chewed gum and the foil wrapper and record in data table.
6) Dispose
of the gum and weigh the foil wrapper and record in data table.
7) Dispose
of the foil wrapper, clean lab station and return scale to front of class.
Data Table:
|
ITEM |
WEIGHT (g) |
|
Unchewed gum and |
|
|
Chewed gum and |
|
|
Weight of wrappper |
|
|
Weight of unchewed |
|
|
Weight of chewed |
|
|
Weight of sugar |
Calculations:
1) Subtract
the weight of wrapper from the unchewed gum and wrapper and record in data
table.
2) Subtract
the weight of wrapper from chewed gum and wrapper and record in data table.
3) Subtract
the weight of chewed gum from unchewed gum and record in data table as weight
of sugar.
4) Calculate
the percent composition of the sugar in the gum by dividing the weight of the
sugar by the weight of the unchewed gum times 100%.
Conclusion:
1) Was your
hypothesis correct?
2) What did
you learn?
3) Why did
things happen?
4) Problems?
5) Improvements?
