SNC2LI
GRCI Science
REFERENCE LAB: How Much Sugar in a Piece of Bubble Gum?
NOTE: Every phrase in a lab report should be in the PAST, IMPERSONAL TENSE.
This means no "I", "We" etc. and not "is" but "was" etc.
Purpose:
The purpose of the lab was to determine the percentage _____________ in a
piece of bubble gum, and, to examine the differences between
_______________ and _____________________ bubble gum.


The purpose of the lab is the reason why the lab was performed.
Ask yourself the question "What was I trying to find out in the
experiment?"
Hypotheses:
It was predicted that the percentage sugar would be _________ %; that the
properties of the unchewed and chewed gum would be quite
and that the density of the chewed gum would be ____________ than that of the
unchewed gum.


An hypothesis is an educated prediction as to the outcome of an
experiment.
(If ... then ... .statement when a variable lab is performed)
Materials: gum, electronic balance, volunteer chewer
Method:
1. Make careful qualitative observations.
2. Unwrap the gum...don't chew it yet!
3. Tare the electronic balance.
4. Mass the wrapper.
5. Mass the wrapper and the unchewed gum.
6. Chew the gum for 5 min.
7. Tare the electronic balance.
8. Mass the chewed gum ON THE WRAPPER.
9. Make careful qualitative observations of the chewed gum.

You do not have to recopy the materials and method. The proper format is:
Refer to attached hand-out with “A sample lab report” written at the bottom
SNC2LI
Observations:
GRCI Science
Table 1: Qualitative Observations of Gum
Observations
Texture
Colour
Odour
Shape
Taste
Gum before chewing
Gum after chewing
Table 2: Quantitative Mass Observations of Gum
a. Mass of wrapper
b. Mass of unchewed gum + wrapper
c. *Mass of unchewed gum
d. Mass of chewed gum + wrapper
e. *Mass of chewed gum
f. Mass of sugar in gum
*calculations
 Observations are the detailed notes taken as the experiment was
performed. They are usually recorded in a table format
 Observations are what we see, smell, hear, taste (not usually safe!), feel
and measure during an experiment.
Calculations:
1. Mass of unchewed gum
=b–a
=
=
d–a
2. Mass of chewed gum
=
=
3. Mass of sugar in gum
=c–e
=
=
% by mass of sugar in gum = mass sugar
x 100%
mass unchewed gum
=
=
 Calculations show any math we have performed in an experiment.
 All calculations should be titled and contain an equation.
 Measurements should then be substituted into the equation with
appropriate units.
 The answer should he circled and should contain the appropriate units.