Activity b:
temperature and
molecular motion
get the gizmo ready
. click reset, and select the micro view
set ice volume to o cm
• set add/remove heat energy to o jis
question: why do phase changes occur?
1. compare: set the water temperature
click reset set the water temperatu
perature to oc and click play observe the water molecules
ater temperature to 100 °c and click play again
what do you notice?
observe: click reset. the mean mol
.. below the container. set the "
400 j/s. click play.
the mean molecular speed of the water molecules is displayed
e container. set the water temperature to 0 °c and add/remove heat energy to
a how does the mean speed of the water molecules change as they are heated?
b. does the mean molecular speed change as much as the temperature as the
water heats up? explain.
3. explain: how is temperature related to the motions of molecules?
4. observe: click reset. set the water temperature to 20 °c and the ice volume to 50 cm?
set add/remove heat energy to 0 j/s. click play. how do the molecules in the liquid
interact with the molecules in the solid?
(activity b continued on next page) phase changes gizmo i have ap notes