Transcript measure the temperature

ANSWERS to HMK
Questions 1-3 for
Lesson 0.1 (Page 2)
1. When dry ice (solid carbon dioxide)
sublimes, the individual molecules
move farther and farther apart. Draw a
picture at the particle level that
illustrates this process of sublimation.
1. When dry ice (solid carbon dioxide)
sublimes, the individual molecules
move farther and farther apart. Draw a
picture at the particle level that
illustrates this process of sublimation.
2. Arthur writes the following explanation for watching dry ice turn
into a gas: “I think the dry ice is burning because I saw smoke
coming from it. So I know there must be a fire inside the dry
ice.”
a. Give Arthur feedback about his explanation. Does he have a
claim? Did he use evidence? Did he connect the claim and
evidence using scientific reasoning? Are there other pieces of
evidence he should consider?
YES Arthur made a claim and he used
evidence—but perhaps he should measure
the temperature of the “smoke” (it’s actually
water vapor condensing because of the cold
dry ice, it’s not burning at all!)
3. You have a sample of ice (frozen water).
a. Draw what you think the molecules look like within the block
of ice (if you could zoom in with a really powerful microscope,
what would it look like? What would the molecules be doing?)
The molecules would be orderly and
vibrating.
3. You have a sample of ice (frozen water).
b. Draw another diagram showing what the molecules would
look like when the block melts.
The molecules are moving faster and
sliding past one another!
3. You have a sample of ice (frozen water).
c. Draw another diagram showing what the molecules would
look like when the water evaporates.
The molecules are moving like CRAZY
and are much further apart.
3. You have a sample of ice (frozen water).
d. Describe how molecules in a gas (part c) are different than
those in a solid or a liquid (part a and b).
The molecules are all the same shape
and size but the distance between
molecules as well as their speeds
changes in a solid vs. liquid vs. gas.