QUICKLY
WRITE IN
YOUR
PLANNE
R AND
BE
READY
TO
START
THE
LAB.
Is Yeast
Alive?
How to Set Up the
“Is Yeast Alive?”
Lab
Materials and Equipment
4 Test Tubes
Test Tube Rack
Yeast (1 cup)
Beaker
4 Balloons
Sugar (2 packs)
STEP 1
Beaker
Fill a beaker with 40
mL of warm water from
Mrs. Plankenhorn.
STEP 2
Add the yeast from the
white paper cup A LITTLE
BIT AT A TIME into the 40
mL beaker of warm water—
STIRRING the yeast
thoroughly before adding
more.
40 mL
Pour yeast solution from
the beaker into each of the
four test tubes, filling evenly
(about 10 mL in each tube.
Step 4:
Sugar Packet
Test Tube 1
Test Tube 2
Add one packet of sugar to test tube 1
and one packet of sugar to test tube 2.
Do NOT add sugar to test tube 3 or test
tube 4!
Step 5:
With 1 person…
Finished…
With 2 people…
Cover the opening of each test
tube with a balloon to trap any gas.
This can either be done by one or
two people. (see examples above)
Step 6:
Your thumb...
Hold your thumb over
the end of each test
tube and shake it
vigorously until the
contents are completely
mixed.
Test Tube with balloons
Pink = with sugar
Orange = NO sugar
Step 7
Step 8:
Remember to
write down all
observations.
Make detailed
sketch of the setup during the last
five minutes.
Return test tubes to the rack and record initial
observations on your lab paper.
Then, every 5 minutes observe and record any changes.
Include additional sketches and written observations.