In the first place, students will watch in the follow link a short animation about this concept. It is very good because has audio and students can practice different skills while learn the topic. In this case reading and listening.
Animation link: http://preparatorychemistry.com/KMT_flash_audio.htm
In order to reinforce the concepts learned students will do this interactive glossary quiz with 34 terms: http://preparatorychemistry.com/Glossary_2_CF_flash.htm
Now, students are ready for watching this video about the changes of state:
TRANSCRIPT:
0:03
when you saw it gets warm enough
0:05
it now to explain what's happening
0:08
imagine you can see how the particles in a solid arranged
0:12
there in affixed framework vibrating
0:16
but not straying far from their main position when energy is supplied
0:21
the particles vibrate more violently and become free to move
0:25
the solid changes into a liquid
0:36
melting involves a transparent energy this can be illustrated by putting an
0:42
in a sealed container leaving another one empty
0:49
yeah on the left is it twenty five point five degrees Celsius
0:53
as the ice melts it takes energy from the surroundings
1:01
the temperature at the end in the right on container this fallen by about 3
1:06
energy is also needed to change a liquid to a gas
1:11
so what's happening to the particles this time
1:16
in a liquid the particles a free to move around
1:19
eating causes them to move around more quickly
1:23
those which have enough energy escape from the liquid
1:27
forming a guess this is evaporation
1:36
evaporates at room temperature is taking energy from the surroundings
1:40
and disappears in less than five minutes is possible to see how different liquids
1:49
take heat from their surroundings
1:51
using thermometers wrapped in stream they all start of it mean temperature
2:02
the string absolves the liquids
2:08
number one on the left is a control number two
2:12
is dipped into water 3 into ethanol
2:15
the full into each other as soon as the string leads the liquid
2:21
its operation get underway
2:31
the temperature at the moment is three and four quickly begins to drop
2:34
as the liquids evaporate they're taking energy from the string
2:39
the N and even the ball but the thermometer
2:47
which taken most energy from its surroundings liquid
2:59
gases can also be changed into liquids for this to happen they need to be
3:04
liquid nitrogen is extremely cold
3:09
im us a balloon for that in it
3:12
and see what happens the balloon shrinks and becomes brittle
3:19
inside you can see liquid
3:23
its liquid and this time the balloon is filled with carbon dioxide gas
3:36
invested in liquid nitrogen
3:41
and cools rapidly was inside the balloon
3:52
if the gas gets cold enough it changes into a solid
4:01
is solid carbon dioxide see how it changes back to a gas that mean
Finally, students, in groups, will play with this fantastic simulation and each group will prepare a short exposition of an assigned kind of change of state using the application.
App link: https://phet.colorado.edu/en/simulation/legacy/states-of-matter-basics
All in all, students will learn the specific content and will train their language skills.
