TITLE: Ice Cream In A Bag
AUTHOR: Cindy Robinson, Owasso Junior High,
Owasso, Oklahoma
GRADE LEVEL/SUBJECT: Appropriate for 8-9; Matter
OVERVIEW: The concepts of matter can be at times too
"scientific". This activity enables the students to observe
the changes of matter in a fun way.
OBJECTIVE(s): Students will be able to:
1. Observe matter changing states.
2. To describe change.
RESOURCES/MATERIALS:
4 beaten eggs, 2 cups sugar, 4 cups half and half, 2
teaspoon vanilla, 1/2 teaspoon salt, milk, clean gallon jug
with cap, crushed ice, table salt, spoons and cups, large
re-sealable plastic bag (1 for each 2 students), small re-
sealable plastic bag (1 for each 2 students).
**NOTE: This activity is more pleasant for the teacher when
it is done outdoors!
ACTIVITIES AND PROCEDURES:
1. Place the beaten eggs, sugar, half and half, vanilla,
and salt in the clean gallon jug. Add milk until the
jug is almost full. Place the cap on the jug and shake
well to mix all the ingredients.
2. Give each pair of students a small re-sealable bag.
Pour approximately 1 cup ice cream mixture in each bag.
Seal well.
3. Give each pair of students a large re-sealable bag half
filled with ice. Have the students place the ice cream
filled bag into the bag of ice. The students should
place about 1/4 cup of salt over the ice. Seal the
large bags.
4. The students can take turns or work together to "churn"
the ice cream. The ice should be continually moved
around the ice cream mixture.
Note: additional salt may be added to decrease
freezing time. Have the students guess how long it will
take to freeze the ice cream
5. When the ice cream is frozen, remove it from the bags,
place in individual cups and allow the students to
enjoy their ice cream!
6. Have the students compare their guesses to the actual
time it took the ice cream to freeze.
TYING IT ALL TOGETHER:
1. Why did some bags of ice cream freeze faster than
others ?
2. Would twice as much ice it to freeze twice as fast ?
3. How would the absence of salt affect the freezing
time?
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