AQA GCSE Chemistry - C2 & C3 (14th May 2015)

Reply 180

physicsamor

20

Original post by harryleavey

I think everyone is struggling with this. My class kind of dismissed it until now.
:mad:

I still don't get it none of the experiments make sense XD
cries
cries
cries some more

Reply 181

ssssara

Original post by harryleavey

I think everyone is struggling with this. My class kind of dismissed it until now.
:mad:

Do you think it's really that big of a deal if I just don't really learn this part? I know basics like neutralisation reaction and the difference between a base and an alkali but other than that........

Reply 182

harryleavey

16

Original post by ssssara

Do you think it's really that big of a deal if I just don't really learn this part? I know basics like neutralisation reaction and the difference between a base and an alkali but other than that........

I was speaking to my chemistry teacher and he kind of made it clearer. But I don't think I could even try to explain it. I might tell you the complete wrong thing :eek:

. But it is going to be a max of 6 marks lost. So I would forget it and focus on something else.

Good luck - I will be hoping it doesn't come up too :redface:

Reply 183

RotomGuy

2

Yeah, I really need to know the basics of the acids, bases and salts, because it's the only part im genuinely clueless on.

Reply 184

ssssara

Original post by harryleavey

I was speaking to my chemistry teacher and he kind of made it clearer. But I don't think I could even try to explain it. I might tell you the complete wrong thing :eek:

. But it is going to be a max of 6 marks lost. So I would forget it and focus on something else.

Good luck - I will be hoping it doesn't come up too :redface:

Hahaha sounds like good advice :tongue:

. Good luck tomorrow in the exam also, I'll be thinking of you, hoping that nothing on this topic comes up except for the neutralisation reaction. :') Let me know how it goes for you :smile:

Reply 185

harryleavey

16

https://youtu.be/9zdKq2-6Qm8?t=15m9s
This might help. Start at roughly 15 minutes to miss the basics

Reply 186

maxjackson5

2

Original post by Kinnon

What's the "Ar"

If you look at Oxygen for example on the periodic table, the Ar is 16 :smile:

it is simply the mass number

Reply 187

harryleavey

16

And maybe this for some comic relief: https://www.youtube.com/watch?v=IAJsZWhj6GI

Reply 188

pollyy

6

Original post by ssssara

please can someone simplify exactly what I have to learn for Acids, Bases & Salts because I'm really really struggling

Acid: A substance with a PH less than 7. Forms H+ ions in water.
Base: A substance with a PH over 7.
Soluble bases are alkalis which form OH- ions in water.

Acid + Base = Salt + Water
In ionic form: H+(aq) + OH-(aq) = H20(l)
This is the basic neutralisation reaction. The products of a neutralisation reaction are always neutral, hence the name.

Other useful neutralisation reactions:

Acid + Metal = Salt + Hydrogen (unless metal is less reactive than H2)

Acid + Metal Oxide = Salt + Water
Acid + Metal Hydroxide = Salt + Water
Acid + Metal Carbonate = Salt + Water + Carbon Dioxide

Most metal oxides and hydroxides are bases (insoluble).
The only exception to these equations is the neutralisation of ammonia by nitric acid to produce ONLY ammonium nitrate (no water).

Someone posted the methods for making different salts earlier, and explained it better than I can, so maybe have a look at that too! Hope this helps :smile:

Reply 189

bethanyymoore

1

i think that actually doing the titration with the equipment and everything has been taken off the spec? my chemistry teacher said so, but i don't know...

Reply 190

GarlicBread01

11

What time should I sleep seeing how the exam is in the morning?

Reply 191

thepurplerain

15

Original post by harryleavey

What page is it on?

Sorry I don't know I'm out right now but the page is titled 'Making Salts' and it is on the right

Reply 192

morganlethbridge

3

can someone please explain to me all i need to know about salts and insoluble salts??

Reply 193

Emily139

1

Is there a chance that the Haber process could be the 6 mark question for C3?

Reply 194

$Avatar for \\\$

\\\

1

Original post by Sanderm1

What time should I sleep seeing how the exam is in the morning?

8 or 9 hours will be fine. The worst thing to do is spend the whole evening worrying/ revising/ both.

Reply 195

GenuineHpLaptop

9

Original post by morganlethbridge

can someone please explain to me all i need to know about salts and insoluble salts??

Insoluble salts are made by precipitating ions out of two solution mixtures.

Solube salts can be made in two ways
1. An acid and excess base
2. Neutralisation using acid and an alkali (titration)

Reply 196

hrmpurser

2

Kill meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee 13 & 1/2 hours

Reply 197

iKali

2

do you guys know what can come up on the c2 paper?

Reply 198

morganlethbridge

3

Original post by GenuineHpLaptop

Insoluble salts are made by precipitating ions out of two solution mixtures.

Solube salts can be made in two ways
1. An acid and excess base
2. Neutralisation using acid and an alkali (titration)

ah right what is precipitating

Reply 199

ssssara

Original post by pollyy

Acid: A substance with a PH less than 7. Forms H+ ions in water.
Base: A substance with a PH over 7.
Soluble bases are alkalis which form OH- ions in water.

Acid + Base = Salt + Water
In ionic form: H+(aq) + OH-(aq) = H20(l)
This is the basic neutralisation reaction. The products of a neutralisation reaction are always neutral, hence the name.

Other useful neutralisation reactions:

Acid + Metal = Salt + Hydrogen (unless metal is less reactive than H2)

Acid + Metal Oxide = Salt + Water
Acid + Metal Hydroxide = Salt + Water
Acid + Metal Carbonate = Salt + Water + Carbon Dioxide

Most metal oxides and hydroxides are bases (insoluble).
The only exception to these equations is the neutralisation of ammonia by nitric acid to produce ONLY ammonium nitrate (no water).

Someone posted the methods for making different salts earlier, and explained it better than I can, so maybe have a look at that too! Hope this helps :smile:

thank you so so so so much! I really appreciate it thank you. Good luck tomorrow x

AQA GCSE Chemistry - C2 & C3 (14th May 2015)

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