Youtube daily which May 6 2017

Hi!

The topic which I would like to share on my persuasive speech today is "traditional

books versus e books.

Which one is better?"

The reason I choose this topic is because as a university student, this question has

troubled me for the first two years when I just entered the university.

The amount of text books that university students are required to purchase for class is very

high.

For example there are at least 50 subjects we need to complete throughout our study,

and we need to buy 50 traditional textbooks if there are no e books available.

Some more, one traditional textbook may cost us about 100 ringgit or even more.

With calculation, these cost us 5000 ringgit to purchase the entire textbook within the

study years.

But, compare to buying a tablet which is necessary for using e books, it only cost us with maximum

1000 ringgit.

As a student, I believe having a laptop is also very common as we need to do project

and assignment.

With laptop, we can access e books hence money of buying tablet can also be saved.

With e books being available I think this is a great alternative to the traditional

textbook.

I would like to support only university student to switch using e books rather than traditional

textbooks.

This is because younger child lack of self-control and they might be distract by the games in

the electronics devices when study.

Price of textbook in secondary school or primary school is still affordable and government

do provide plans of borrow textbooks for those who cannot afford.

Come back to my point, I support university student for using e books not only because

it can save money, but also because of several reasons.

1st Storage.

One electronic device can help you to hold hundreds of e books, when you travel you can

take your entire book library with you and just hold it in the palm of your hand.

You will never have to worry about losing a book because you can download it again anytime.

Furthermore, carrying them to class is much lighter compare to carrying a big and bulky

textbooks.

2nd Speed.

E-books are convenient.

You can download notes from a website; purchase a book directly from your cell phone at any

time, day or night.

There are no shipping expenses charge on you.

In just few minutes time, it appears on your device and you can be reading it freely.

3rd Features.

Some e-books can be interactive and contain audio, video and animations, which can be

very attractive.

Reading an e-book has certain advantages over reading traditional books that is you can

adjust the size of the text to enlarge or narrow it.

You can change the font and the color of the background to suit your tastes.

You can also highlight passages, write notes, and bookmark pages.

You can also quickly search some words or phrases written in e books or even translate

the definition.

Last is also the important one, e books save paper and are better for the environment.

Switching to e-books is something we can all do that can benefit the environment by reduce

the use of paper.

So, understanding how e books can be a better choice for university students can greatly

help with the problems cause by textbooks.

If you are facing the same problems like me, switch to e books.

Thankyou.

For more infomation >> Persuasive Speech : Traditional books vs Ebooks. Which one is better? - Duration: 4:00.

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How To Know Which End Screen Elements To Use - FP- How To Do Video Marketing On Your Own Series - Duration: 1:53.

Taylor here with Financial Potion where we believe video is the potion to relieve business

owners from their financial worries.

End screens are mobile friendly elements that are placed in the last :20 of a video.

With that said, the video has to be at least :25 seconds long.

You're allowed up to 4 card elements and take note of the box of "okay area" to

place the card.

You're going to want to keep this in mind as you're in production and editing to keep

some space for these elements.

If you're using end screens you have to make at least one of them a link to a video

or play list.

If you regularly post videos then it's suggested to link to your most recently uploaded video

to help boost its views.

If you don't then we suggest linking to a play list or YouTube suggestion.

With YouTube End Screens still being new we're doing marketing test with those options.

The other key element to link is the subscription button I am happy there is a mobile friendly

way to encourage more subscribers.

This image will take on your profile picture image.

The 3rd and honestly only other element we use is the link to the website.

With the end screen you can either have it pull at image from the web page it's linking

to or you can upload your own custom image like you're about to see.

I hope you use this information to do some mobile friendly youtube optimization during

your video marketing weekend.

Subscribe to get tips every Friday, become a Patron or connect with us directly if you

ever need extra production assistance or training.

Till next week, stay engaging!

For more infomation >> How To Know Which End Screen Elements To Use - FP- How To Do Video Marketing On Your Own Series - Duration: 1:53.

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Chapter 7.7 - Nucleophilic Substitution - Which Mechanism? - Duration: 8:27.

Next we'll look at how different parts of the reaction will affect which mechanism we follow.

So, so far we've talked about the two mechanisms but we've never figured out whether a specific reaction will follow the SN1 mechanism or the SN2 mechanism.

So we'll look at a few different things. We'll look at the leaving group.

We'll look at the nucleophile.

We'll look at the alkyl halide.

And we'll look at the solvent.

And we'll see how each one of these has an effect on the reaction.

So first off, let's just look at the leaving group.

Okay, so for now, we'll we'll just assume that it's an SN2 reaction

to draw our products.

So as I change from bromide to iodide,

what changes in my reaction?

Well, really the only difference is here, bromide versus iodide.

And so what we care about with the leaving group is how stable our leaving groups are.

And of course the stability of the leaving group is related to the pKa of their conjugate acids. So HBr has a pKa of about minus 9.

HI has a pKa of about minus 10.

What does that mean? That means that I minus is about 10 times more stable on its own than Br minus.

And if this one is about 10 times more stable on its own, then it should be a better leaving group.

Okay, so whatever is more stable on its own is a better leaving group.

So if you want to think of it this way, a better leaving group

is the conjugate base of a stronger acid.

So that would make this reaction faster.

With iodide as my leaving group, then the first reaction with bromide is my leaving group.

Okay. So that compares between those two, but those are both SN2 mechanisms. What happens in an SN1 mechanism?

Well, this the rate determining step of an SN1 mechanism. And we can already see where the difference lies.

In the rate determining step, I'll either form a bromide or an iodide.

Which one of those is more stable?

The iodide is more stable. So which one of these reactions should be faster?

The one with the iodide should be faster.

So if you see this, it doesn't matter whether you have an SN2 or an SN1 type reaction mechanism; this one is SN2, this one is an SN1, better leaving groups make both mechanisms faster.

The downside of that is they do not help us choose between the two mechanisms

or choose the more likely mechanism.

So that's the leaving group effect.

What about the alkyl halide? So let's look at an SN2 first.

I'll look at a primary alkyl halide versus a tertiary alkyl halide.

I'll keep using the same reaction.

Uh, you'll find out actually in the next chapter that there's a competing reaction with this, which is an elimination. But for now we'll keep using the same reaction.

If I'm going to do an SN2, that means that the hydroxide has to come in as the chloride leaves. Hydroxide comes in

as the chloride leaves.

Now, there's a difference between these two and that is that there's very little sterics in the primary alkyl halide

because this hydroxide is coming in passed two hydrogens, which are very small atoms.

Conversely, in tertiary alkyl halide, this hydroxide is coming in, there are three methyl groups out here. And of course each one of these has hydrogens on it.

So steric issues are a much more important with the tertiary alkyl halide.

So we have steric problems doing an SN2 on tertiary alkyl halide.

What about an SN1 reaction?

Well, in the SN1, the chloride leaves first in both cases leaving a carbocation behind,

which then has the hydroxide add to make the final product. But now when this hydroxide adds, these are both planar,

which means the top and the bottom are both open. So there are no steric issues really in an SN1 reaction.

It's much easier to bring our hydroxide into the planar intermediate than it was back here to come in and have to displace the halogen off of the SB 3 hybridized carbon that already has four groups surround it.

These carbons only have three groups surround them. So the difference here

is actually that we make a primary carbocation in this case, versus a tertiary carbocation.

And carbocation stability

says that tertiary is better than a secondary carbocation, which is more stable than a primary carbocation, which is more stable than a methyl carbocation.

So if I look at these two reactions now, this one is going to be favored

'cause it makes a more stable carbocation.

While up here, the first one was favored because of very small sterics. So in a primary alkyl halide, it wants to do an SN2 type reaction,

whereas a tertiary alkyl halide

wants to do an SN1 type reaction.

Why again? The primary wants to do an SN2 because of less sterics.

And a tertiary wants to do an SN1 because it has a more stable carbocation.

So hopefully the next question that you have is, what about secondary?

And for secondary, it depends.

And I'm going to leave it at that. And we'll come back to it after we look at some other effects.