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Chemistry: 3.6 Physical and Chemical Changes 106 Views
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Description:
Some chemicals have chemistry with other chemicals. Whether it's romantic bonding or...less romantic exploding, changes can occur when you put chemicals together. Today's lesson is all about those changes.
Transcript
- 00:03
Chemical Kevin is growing up. [Flask labelled 'Chemical Kevin']
- 00:05
Like all boy and girl chemicals when
- 00:07
they reach a certain age, Kevin is
- 00:09
starting to experiment with other [Kevin pouring chemicals]
- 00:12
chemicals. It's a new and exciting time
Full Transcript
- 00:14
for him, but it's also a little scary.
- 00:16
Most times that Kevin's gone out of his
- 00:18
comfort zone and interacted with another
- 00:20
chemical, there's been some sort of
- 00:21
reaction. Often it's nothing major, but
- 00:23
every once in a while, there are some [Kevin reacting with other chemicals]
- 00:25
real fireworks. And while those fireworks [Kevin turns black]
- 00:27
are worth more than the price of
- 00:29
admission, they're are also enough to scare
- 00:30
the pants off poor Kevin. His parents were [Kevin in his underwear]
- 00:33
never very good at preparing him for
- 00:35
these changes, so he's having to learn
- 00:37
the hard way. The first change he noticed
- 00:39
was a color change. Well, when he hooked up
- 00:41
with Karen, he suddenly traded his pale
- 00:43
blue color for a vibrant green. It was a [Kevin changes color]
- 00:46
welcome change, even if he did suddenly
- 00:48
clash with half his wardrobe. As it was
- 00:50
later explained to him, every chemical
- 00:52
compound basically has a kind of
- 00:54
fingerprint when it comes to color.
- 00:56
Each compound absorbs a certain set of [A light being shone on a chemical]
- 00:58
colors of light, but when it's mixed with
- 01:00
a new compound and the chemical makeup
- 01:02
changes, so does the absorption spectrum. [The chemical is mixed and it changes color]
- 01:06
Kevin was just fine with his new look
- 01:08
though. In fact, people had been telling
- 01:09
him for quite a while that he should go
- 01:11
green. Well the next change Kevin noticed was [Kevin kicks a can]
- 01:14
a change in temperature. When he got [Flames appear]
- 01:16
together with Kelly, things definitely
- 01:18
started to heat up in a hurry. Within
- 01:20
seconds, he'd gone from room temperature [Kevin becoming hot]
- 01:22
to a toasty 92 degrees. What Kevin
- 01:25
learned was that when a chemical
- 01:26
reaction results in the breaking of more
- 01:28
bonds than are formed, extra energy is
- 01:31
required and that energy is ultimately
- 01:34
released, which makes the surroundings
- 01:36
hotter. No wonder the windows were
- 01:38
steaming. As Kevin hopped from one chemical [Steamy car windows]
- 01:40
to another--he wasn't a one-chemical sort
- 01:43
of guy, unfortunately--he experienced all [Kevin meeting other chemicals]
- 01:45
sorts of other changes. One time, he
- 01:48
emitted light; another, he experienced a [Kevin giving off a light beam]
- 01:51
change in volume; and yet another time, he
- 01:54
was suddenly able to conduct electricity, [A electric spark coming from Kevin]
- 01:56
which was a cool party trick. But far and
- 01:58
away the most humiliating episode was
- 02:00
when Kevin started macking on Christina. [Kevin and Kristina on a motorbike]
- 02:03
Well, right in the thick of things, Kevin
- 02:04
noticed that bubbles of gas had begun to
- 02:07
appear. How mortifying. But it wasn't
- 02:09
only the gas. He looked down and sure
- 02:12
enough, a precipitate had formed at the bottom of his
- 02:15
beaker. It was tough to say who wanted [Kevin and Kristina looking unhappy]
- 02:17
out of there faster, Kevin or Christina.
- 02:20
But, as with other reactions, Kevin
- 02:22
eventually learned that what he had
- 02:24
experienced was totally natural. Gas
- 02:26
bubbles and precipitates are both common
- 02:29
results of chemical reactions, although
- 02:31
they don't help to explain those wisps
- 02:33
of hair that have started to appear on [Kevin growing a moustache]
- 02:34
Kevin's upper lip. Well, good luck to
- 02:36
Kevin with all of his future romantic [Kevin on a date]
- 02:38
endeavors. Hopefully he never forgets
- 02:41
it's all about the chemistry.
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