Waching daily Aug 26 2018

In this video, we're gonna go through how to determine if a molecule is polar or not.

The way it works in figuring out if an overall molecule is polar or not

starts with the Lewis structure. Then, based on the Lewis structure we figure

out the geometry using VSEPR theory. Within a molecule, we'll need to then

investigate all the bonds that exists. We determine the type of bonds whether they

are polar or nonpolar covalent bond and then putting together the bond

polarities and the geometry and a little bit of vector knowledge we can then

determine if the molecule is polar as a whole or not. Sounds like a lot of

work, doesn't it? What if I tell you there's an easier way to find out the

molecular polarity? You'll be interested to know? Well, here it is. Basically we

deem the molecule as polar if there are different terminal atoms or there's lone

pair surrounding the central atom. Notice, if either one of the statement is true

then the molecule is polar. It doesn't have to fulfill both statements.

Then, what if both statements are not true? Well, in that case then the molecule is

classified as nonpolar. Sounds easy, right? Let's try out with

some examples. CF4, our first example. Before we start, let's just make sure

that we know which is the terminal atom and which is the central atom. So in this

example, carbon is the central atom since it is at the center of the molecule and

fluorine, F is the terminal atom because it surrounds the carbon. Terminal because

it is at the end and lone pairs are a set of electrons like this. So are there

different terminal atoms in CF4? Nope. All of our terminal atoms are fluorine,

therefore there are the same. Alright what about the next statement? The lone

pair surrounding central atom. Well, do you see any lone pair surrounding carbon?

Nope. Since both statements are not true then

CF4 is a nonpolar molecule. Let's look at our second example, HCN.

So, are there different terminal atoms in

this molecule? Yep. We have hydrogen and nitrogen. These two are two different

terminal atoms and since this statement is true therefore HCl is a polar molecule.

Moving on to our final example, NF3. As usual, our first question,

are there different terminal atoms in this molecule?

Nope. They are all fluorine. What about lone pairs surrounding the central atom?

The central atom in this case is nitrogen. Yep, there's actually one lone

pair on nitrogen. Since this statement is true therefore

NF3 is a polar molecule. That's all I have for this video. I hope the three

examples helped to explain how to easily decide if a molecule is polar or not.

Want to try out on your own? Here are a few questions. I'll place the answers in

the description box. I hope you find the video helpful. Do subscribe.

Thanks for watching and I'll see you in the next video.

For more infomation >> How to determine if a molecule is POLAR or NOT | SUPER EASY way | Must Watch – Dr K - Duration: 3:18.

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Kaizer Chiefs coach Solinas says new signing Manyama is a 'fantastic player' - Duration: 3:52.

Kaizer Chiefs coach Solinas says new signing Manyama is a 'fantastic player'

Kaizer Chiefs coach Solinas says new signing Manyama is a 'fantastic player'.

  Giovanni Solinas says his new attacker Lebogang Manyama is a "fantastic player".

Manyama‚ signed from Turkish club Konyaspor on Wednesday‚ doubled the number of former Premier Soccer League players of the season acquired by Chiefs in the preseason transfer window.

The first was Khama Billiat‚ signed after his contract ended at Mamelodi Sundowns at the end of June.

Manyama was player of the season after he helped brand new PSL club Cape Town City finish third in 2016-17.

Billiat won the award after he was crucial in Sundowns winning the league in 2015-16.

"I know Lebo.

In my opinion he's a fantastic player‚" Solinas said.

"I think when Lebo's fitness is OK it can help us to get results.

Because he's a fantastic player.

In my opinion he's a player of the level of Kaizer Chiefs.

"Because Chiefs are a big club and need big players.

He's a big player.

"I am very happy for Lebo.

And we will wait for him.

At the moment he's not ready because the fitness is not top.

So we will work hard to improve Lebo's fitness.

"I am sure that when Lebo is 100 percent fit it can help us and he will play well." Solinas has said that Manyama will not be part of Chiefs' squad for their MTN8 semifinal first leg game against SuperSport United at Lucas Moripe Stadium on Sunday as he still lacks match fitness.

It might take the Bafana Bafana international a few weeks to gain match competitiveness.

Manyama had a disappointing season for Konyaspor after signing there from City in August last year.

He was fielded in just 10 league and cup games‚ starting only three‚ and has not played in seven months since Konyaspor's 1-0 Turkish Cup win against Trabzonspor on December 27.