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Chemistry Videos 44 videos

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Chemistry: 2.1 Significant Figures and Scientific Notation
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These figures may not be significant to you, but they matter to us, okay? Oh, and to Science. They matter a ton to Science.

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Chemistry: 4.3 Calculating Subatomic Particles 77 Views


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Description:

Don't let any atoms near us. We heard that they're "part tickles" and we're having none of that. No sir. You have fun watching this video about calculating subatomic particles. We'll be over here.

Language:
English Language

Transcript

00:03

Verner von Numberstein, the

00:06

world-famous scientist and [Numberstein stood on stage]

00:07

mathematician, has begun teaching

00:09

Heinrich, his one-year-old son, his ABCs

00:12

and one-two-threes. However, because the

00:15

Verner feels that nothing should be easy, [Verner teaching Heinrich in a classroom]

00:17

he's making Heinrich learn to count

00:19

using subatomic particles. Years from now,

00:22

Heinrich will have the option of filing [Heinrich working]

00:24

a parental abuse lawsuit, but for now, he's

00:27

a bit stuck. Well, first Verner introduces

00:30

Heinrich to the atomic number. That's the

00:32

number that appears right next to every [Atomic number highlighted]

00:34

element of the periodic table of

00:35

elements. This number, Verner explains,

00:38

represents the number of protons in a

00:40

given element. A helium atom, for example,

00:43

has two protons inside its nucleus, so it [Helium atom with 2 protons inside]

00:45

has an atomic number of two. Magnesium

00:48

has 12 protons, so it has an atomic

00:51

number of 12. Foolium has 143 protons...

00:55

Okay, there's no such elements to foolium;

00:57

Verner's just trying to keep Heinrich on [Heinrich stands up and falls down]

00:59

the toes, which is tough, since the kid

01:01

isn't even walking yet. Verner then

01:03

points out the mass number. Well, the mass

01:05

number is the number of protons (i.e. the

01:07

atomic number plus the number of

01:10

neutrons), so in a helium atom that has

01:12

two neutrons, the mass number is four

01:15

(two protons plus two neutrons). In a magnesium [Magnesium protons and neutrons]

01:18

atom that has 14 neutrons, the mass

01:20

number 26 (12 protons plus 14 neutrons),

01:24

and in a foolium atom that has 152

01:26

neutrons... Ah there we go, Heinrich's catching

01:29

on. Foolium once, shame on you... However

01:31

that goes, you know the rest of it.

01:34

Verner goes on to tell Heinrich about [Verner discussing isotopes with Heinrich]

01:36

isotopes, which are atoms that have the

01:38

same atomic number but different mass

01:40

numbers. So for example, two boron atoms

01:43

would have 10 protons, but if one has 10

01:46

neutrons and another has 11, then they're

01:48

isotopes, which by the way is the reason

01:50

the atomic mass on the periodic table is

01:52

always a wonky number--because it's the

01:55

average mass of all the different [Definition of atomic mass]

01:57

isotopes of that element. Got it? Finally,

02:00

Verner gives Heinrich a little pop quiz.

02:01

He tells Heinrich that a certain element [Verner giving Heinrich a piece of paper]

02:04

has six protons and a mass number

02:07

19. He wants to know what this

02:09

element is, its atomic number, and how

02:12

many neutrons it has. The answer, in case

02:14

you're wondering, is that the element is

02:17

carbon, because carbon always has six [Carbon highlighted on a periodic table]

02:19

protons and since the number of protons

02:21

always equals the atomic number, the

02:23

atomic number is also six. And since the

02:26

mass number is the sum of the protons

02:28

and neutrons, then there must be 19-6 (or

02:31

thirteen) neutrons. Well, as for for Heinrich's

02:34

chances of arriving at the same [Heinrich sitting with a stack of books]

02:35

conclusion, well, Verner is quite the optimist.

02:37

Although he desperately wants to crank

02:39

out the next great child prodigy, Heinrich

02:42

has responded to this lesson by sucking

02:44

on a big toe, making a few grunting [Heinrich sucking on his toe]

02:47

noises and, you know, filling his diaper

02:49

for dad, there. For his money, Verner would

02:51

rather be inhaling Beryllium. [Verner holding his nose while taking out a diaper]

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