Chemistry unit one revision aqa lets ask each other questions woop

Original post by Neuth

They do this virtually every year :fyi:

They always put a question in from another topic :redface:

Well then... I better finish by 10 minute revision break now.

Reply 41

Original post by BTAnonymous

Well then... I better finish by 10 minute revision break now.

I'm pretty sure there was a question about seals in my Physics paper :giggle:

It's probably just to differentiate between those who have revised continuously and are well prepared, and those who only look over the content of the exam the night before.

Reply 42

I am screwed, chemistry is like my worst science and I literally know nothing. Biology was supposed to be my best but even that went horribly wrong!
Do we need to know about smart alloys for C1? anyone know thanks :smile:

Reply 43

Original post by Gcse123321

I am screwed, chemistry is like my worst science and I literally know nothing. Biology was supposed to be my best but even that went horribly wrong!
Do we need to know about smart alloys for C1? anyone know thanks :smile:

Stay positive :hugs:

Is there anything I can help you with?

Reply 44

Original post by Neuth

Stay positive :hugs:

Is there anything I can help you with?

I am just going through the specification and making notes, none of it is actually going in but I'm sure I'll be fine, thanks for offering. But do we need to know about smart alloys?

Reply 45

Original post by Gcse123321

I am just going through the specification and making notes, none of it is actually going in but I'm sure I'll be fine, thanks for offering. But do we need to know about smart alloys?

I don't know, sorry - I'm not doing GCSEs :redface:

I can have a look for you?

Reply 46

lauzy00

3

Definitely need the help, chemistry is my worst subject. :s-smilie:

Reply 47

Original post by Neuth

I don't know, sorry - I'm not doing GCSEs :redface:

I can have a look for you?

Ok and yeah please, Bitesize really doesn't help distinguish the difference between core and additional science :s-smilie:

Reply 48

Original post by adlay

okay I'll start. .. Why do we use new methods such as bioleeching and phytomining to extract metals rather than the traditional methods?

Copper rich ores are running out, so scientists are looking for ways to extract metal from low grade ores? Think that's right 😕

Reply 49

Can someone explains everything they know about emulsions/emulsifiers? Thankyou!

Reply 50

Original post by lauzy00

Definitely need the help, chemistry is my worst subject. :s-smilie:

I do it for A-Level, so feel free to ask questions and I'll help you :h:

Original post by Gcse123321

Ok and yeah please, Bitesize really doesn't help distinguish the difference between core and additional science :s-smilie:

The specification is here.
The section on C1 starts on page 34 :yep:

I'm not sure specifically what you're looking for, but I'm sure you know, so take a look on there :h:

Reply 51

Original post by GCSE_core

Can someone explains everything they know about emulsions/emulsifiers? Thankyou!

All I know is that emulsifiers have hydrophilic (water loving) and hydrophobic (water hating) properties. The head of the emulsifier is hydrophilic, so attracts the water based liquid and the tail of the emulsifier is hydrophobic so attracts the oil based liquid. :smile:

Reply 52

123moon

8

I failed biology yesterday i probably got like a D! :frown:

I literally cried afterwards for ages and couldn't sleep last night! I just hope I can make up for it in chemistry and physics next week! I'm nervous! Just hope and pray that the grade boundries are low! Good luck everyone who's doing core next week! :wink:

what do you think will come up?

Reply 53

The specification is here.
The section on C1 starts on page 34 :yep:

I'm not sure specifically what you're looking for, but I'm sure you know, so take a look on there :h:

Thank you so much

Reply 54

What does everything think the grade boundaries for yesterday's biology will be?

Reply 55

Original post by Gcse123321

All I know is that emulsifiers have hydrophilic (water loving) and hydrophobic (water hating) properties. The head of the emulsifier is hydrophilic, so attracts the water based liquid and the tail of the emulsifier is hydrophobic so attracts the oil based liquid. :smile:

Thankyou!

Reply 56

You're probs gonna get me asking about five thousand questions now so i apologise- but what does it mean for an Ore to be concentrated?:
'Ores are mined and may be concentrated beforethe metal is extracted and purified.'

Reply 57

Original post by GCSE_core

Can someone explains everything they know about emulsions/emulsifiers? Thankyou!

Emulsions are tiny droplets which are formed when two liquids are mixed together, Eventually they separate. This is an emulsion.

Emulsions can improve the texture and appearance of foods such as mayo.

Emulsifiers stop two liquids from separating. They do this because they contain molecules. These molecules have two distinctive ends:

Hydrophilic - water loving
Hydrophobic - water hating

Both ends are negatively charged. The hydrophilic end is attracted to water whereas the hydrophobic end is attracted to oil. This means they cannot separate and if two ends meet (so hydrophilic and hydrophilic) they will repel each other because they both have the same charge (negative).

Reply 58

Original post by GCSE_core

What does everything think the grade boundaries for yesterday's biology will be?

Lower than usual. I think 42/41 for an A*. Could be like 2012 where you need 39 for an A* and 32 for an A though so stay positive.

Reply 59