Questlon 2
to prepare for the experiment, follow these steps:
1. put one or two ice cubes in 1 cup of water. chill the cup of water in the refrigerator for 1 to 2 hours.
remove any remaining ice when you take the water out of the refrigerator. this cup holds the ice-
cold water.
2. heat up three cups of water in the microwave for 15 to 20 seconds until they reach 100°f on the
thermometer. if you heat the water too much, wait until the temperature drops to 100°f. these cups
hold the lukewarm water.
3. heat the last cup of water in the microwave until it reaches 212°f. this cup holds the boiling water.
now line up the five glasses and label them a, b, c, d, and e. then put the following contents in each glass:
glass
contents
1 cup lukewarm water
1 cup lukewarm water and 1 tablespoon sugar
1 cup boiling water and 1 tablespoon sugar
1 cup ice-cold water and 1 tablespoon sugar
1 cup lukewarm water and 1 tablespoon sugar (this one will be covered with plastic wrap)
d
use the spoon to stir the contents in glasses b, c, d, and e until the sugar dissolves. then immediately add
a packet of yeast to each glass. wash the spoon and stir in the yeast. cover the top of glass e tightly with
plastic wrap.
wait 15 minutes. then measure the foam level in each glass in centimeters, as shown in the image.
10: 49
. us take measurments of the foam level every 15 minutes for 60 minutes. record your measurments in the table