AS Chemistry- helping each other out!

OP

Ow haha I love Free Radical Substitution!

I think of it as a married couples Cl2.

The break up and feel free and horny so they want to bang. But they're naughty and only go for taken men/women :perv:

So Cl. has an affair with CH4 :sad:

and CH4 break up :sad:

So

Cl. + CH4 --> CH3. + HCl

So now Cl. has a bae, but CH3 is baeless and horny :frown:

So CH3. breaks up Cl2 :frown:

CH3. + Cl2 --> CH3Cl + Cl.

So now CH3. has a bae, but Cl. is baeless and horny :frown:

BUT THEN

All the singles bang :sexface:

and live happily ever after :h:

Reply 2022

OP

But anyways lol,

QUESTION :ahee:

Given a sample of solid calcium chloride, contaminated with calcium carbonate, describe test you would perform in order to confirm the presence of:

(I) Calcium Ions

(idk this lol)

(II) Chloride ions

Silver nitrate solution? :angelblush:

Reply 2023

Original post by Dinaa

But anyways lol,

QUESTION :ahee:

Given a sample of solid calcium chloride, contaminated with calcium carbonate, describe test you would perform in order to confirm the presence of:

(I) Calcium Ions

(idk this lol)

(II) Chloride ions

Silver nitrate solution? :angelblush:

I) flame test calcium goes brick red

II) Add silver nitrate, a white precipitate will form if chloride ions were present, then you could add it to ammonia, silver chloride will dissolve in conc. and dilute ammonia.

Reply 2024

Does anyone have any notes on sigma/pi bonding? cheers

Reply 2025

johnnypong

1

Original post by Dinaa

But anyways lol,

QUESTION :ahee:

Given a sample of solid calcium chloride, contaminated with calcium carbonate, describe test you would perform in order to confirm the presence of:

(I) Calcium Ions

(idk this lol)

(II) Chloride ions

Silver nitrate solution? :angelblush:

calcium...flame test? Yellow/red

chloride ions give a white ppt of AgCl with silver nitrate. Dissolved on the addition of dil. Ammonia

Reply 2026

OP

Original post by BBeyond

I) flame test calcium goes brick red

II) Add silver nitrate, a white precipitate will form if chloride ions were present, then you could add it to ammonia, silver chloride will dissolve in conc. and dilute ammonia.

Omg ofc!

thanks :h:

also

An equation for the thermal decomposition of Calcium nitrate?

And describe a test that could carry out to show the presence of nitrate ions in a solution of the sample?

Is that the brown NO gas test? or relighting a splint test?

Reply 2027

https://www.youtube.com/watch?v=ree49ge4VA4&list=PL60FF39CE25DE9C8D&index=1

Original post by BBeyond

Does anyone have any notes on sigma/pi bonding? cheers

This video sums it up pretty well :tongue:

Reply 2028

https://www.youtube.com/watch?v=ree49ge4VA4&list=PL60FF39CE25DE9C8D&index=1

Original post by Dinaa

Omg ofc!

thanks :h:

also

An equation for the thermal decomposition of Calcium nitrate?

And describe a test that could carry out to show the presence of nitrate ions in a solution of the sample?

Is that the brown NO gas test? or relighting a splint test?

np

2Ca(NO3)2 -> 2CaO + 4NO2 +O2

could be either, would relight a glowing splint as O2 is produced, but a brown NO2 gas is also produced :tongue:

Original post by jshep000

This video sums it up pretty well

cheers brah will check this out

Reply 2029

On section B, /60, i only seem to be getting like 45~ marks. Find it hard to revise for stuff that can come up in section B I don't know why :frown:

Reply 2030

OP

https://www.youtube.com/watch?v=ree49ge4VA4&list=PL60FF39CE25DE9C8D&index=1

Original post by jshep000

This video sums it up pretty well :tongue:

Hai

Why is it sp2 hybridised?

Reply 2031

Original post by jshep000

On section B, /60, i only seem to be getting like 45~ marks. Find it hard to revise for stuff that can come up in section B I don't know why :frown:

What you getting on section A, if you get 19-20/20 on section A that should 100% be an A, but an A is normally much lower than 65 anyway so you should be fine :tongue:

Reply 2032

F1's Finest

21

Original post by Dinaa

Hai

Why is it sp2 hybridised?

Good website for it:

http://www.mhhe.com/physsci/chemistry/carey5e/Ch02/ch2-3-2.html

Reply 2033

Original post by BBeyond

What you getting on section A, if you get 19-20/20 on section A that should 100% be an A, but an A is normally much lower than 65 anyway so you should be fine :tongue:

Like 15~ sometimes I make silly mistakes if there is calculation questions on the multiple choice. Then I could mess up a little bit on section B and not get an A for that paper. :eek:

You just been doing past papers to revise for section B?

Original post by Dinaa

Hai

Why is it sp2 hybridised?

hiiii

Because the carbon had 3 attached groups I think, so it has 2 hydrogens and a carbon which makes it 3. So it is 360/3= 120 as the angle

(edited 8 years ago)

Reply 2034

C0balt

16

Original post by Dinaa

Hai

Why is it sp2 hybridised?

Omfg you're back?

Posted from TSR Mobile

Reply 2035

Original post by James A

Good website for it:

http://www.mhhe.com/physsci/chemistry/carey5e/Ch02/ch2-3-2.html

Wait do we need to know about this for edexcel? First I've ever heard of this.

Reply 2036

Original post by jshep000

Like 15~ sometimes I make silly mistakes if there is calculation questions on the multiple choice. Then I could mess up a little bit on section B and not get an A for that paper. :eek:

You just been doing past papers to revise for section B?

Oh just take your time :tongue:

1hr30 is more than enough! :biggrin:

Yeah pretty much, although apparently there was a fair amount I wasn't taught :angry:

Reply 2037