Name ___________________________________________
Date _____________
Step
1: On the back of this worksheet, draw a picture of the
pretzel.
Step
2: Conduct these quantitative observations:
Length:
____cm, or ____in Width: ____ cm, or ____in
Height:
____cm, or ____in Weight: _____ g.
Step
3: Use the following qualitative observations (your senses)
to describe the pretzel:
Feel _____________________________________________
Smell ____________________________________________
Hear ____________________________________________
See _____________________________________________
Step
4: Complete the following questions for discussion:
What can
you do to physically change the pretzel but still tell that
it is a pretzel?
Take a small bite of your pretzel. What mixes with your pretzel
while you are chewing?
Place a small piece of the chewed pretzel on a tissue (or mash
a pretzel into small pieces and add a small amount of water).
How has the pretzel changed from its original form?
Reflection
(in science journals)
Extension
l. Pretend
that you have two potatoes. One potato is rotting. You are mashing
the other potato. You want to find out which potato is going through
a chemical change. What information will help you decide?
A. The change
in shape of the mashed potato
B. The smell and color change of the rotting potato
C. The mashed potato becoming softer than it was
Why?
2. Which of
the following actions causes only a physical change and not a
chemical change?
A. Tearing
a tissue paper
B. Burning a match
C. Baking a cake
Why?
3. What could you do to show that water changing to ice is a physical
change?
