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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.

Language:
English Language

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

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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