MySQA 2012

Original post by Babb_zz

Nah cause then people would have to flick through loads of pages just to find help, and itll waste to much time

It wouldn't be anything like such. Instead it's as simple as open the thread, post question, read answer. No one's going to blame you for asking a question that was already answered on page 19 of 71. I'd hope not anyway. :tongue:

Original post by TheUnbeliever

Spoiler

It's the AH Maths thread which sparked the idea (you're right, it is 'entertaining an idea' I was looking for. :redface:

), the thread's useful for all of us involved - albeit a bit cliquey - and felt sad that there wasn't one for subjects not at AH level.
As to being put off by the cliquey aspect of it all, I'd argue a similar point of making threads for all your questions; I know I've been put off creating a new thread for help with a homework question. Felt like I'd be spamming. So threads like the AH Maths thread work well as it gives someone a place to ask as many questions as they want without feeling they're being a nuisance to the forum, as that's what the thread's there for.

And also...

integrated group (e.g. the AH maths one)

(edited 12 years ago)

Reply 28

Original post by Hype en Ecosse

Toss them at me, I should be able to help you with the Biology and Chemistry questions.
As to not spam this thread with them, though - ask in here, for now.

I'm amusing the idea of creating specific threads to act as a dumping place for help with specific problems in subjects, like a "Chemistry help" thread, or a "Geography help" thread. Feedback? :tongue:

Its a good idea. But i hate the fact that when you ask something, someone replies AFTER youve done the homework etc.
I dont understand the stuff about alcohols. When the c double bond o is on the inside its called something but then when its on the outside its referred to as something else. whats that all about? And same with the C to OH

Reply 29

badumdumtscht

16

Original post by Ayesha.Tabassam95

Its a good idea. But i hate the fact that when you ask something, someone replies AFTER youve done the homework etc.
I dont understand the stuff about alcohols. When the c double bond o is on the inside its called something but then when its on the outside its referred to as something else. whats that all about? And same with the C to OH

The C=O is a carbonyl group, and if it's on the end if the molecule, it's an aldehyde, but anywhere else it's a ketone. This relates to the next point.

The hydroxyl group position relates to the idea of primary, secondary and tertiary alcohols. If the -OH is on the end of the molecule, it's a primary alcohol (and can be oxidised into an aldehyde), if it's attached to a carbon that has 2 carbons on each side of it (ie on the chain) then it's a secondary alcohol and can be oxidised into a ketone and if the -OH group is attached to a carbon that is attached to 3 other carbond eg a methyl group on the chain then it's a tertiary alcohol and can't be readily oxidised.

Go to HNS.net.uk > higher chemistry notes > Unit 2 Flow Diagram. Best thing for organic chem. :smile:

FWIW, I think the megathread is a bad idea. Newbies will make their own threads.

Reply 30

Original post by Ayesha.Tabassam95

Its a good idea. But i hate the fact that when you ask something, someone replies AFTER youve done the homework etc.
I dont understand the stuff about alcohols. When the c double bond o is on the inside its called something but then when its on the outside its referred to as something else. whats that all about? And same with the C to OH

Yep, badumdumtsch beat me to it. I thought I'd add a bit in.

When it's on the end of a carbon chain, it's called an aldehyde (aka an alkanal), and when it's somewhere else in the middle, it's called a ketone (aka an alkanone), like he said. The reason chemists call them different names is because they have different chemical properties in some respects. The main difference you need to know about at Higher is that aldehydes can be oxidised into carboxylic acids, but ketones can't.
It's the same with alcohols, they have different names because they act differently. :smile:

What he said about the alcohols is spot on. :smile:

You mentioned trouble with calculations, feel free to make a few threads asking questions. ScotQuals has a plethora of scientists willing to help. :tongue:

Reply 31

badumdumtscht

16

Original post by Hype en Ecosse

Yep, badumdumtsch beat me to it. I thought I'd add a bit in.

When it's on the end of a carbon chain, it's called an aldehyde (aka an alkanal), and when it's somewhere else in the middle, it's called a ketone (aka an alkanone), like he said. The reason chemists call them different names is because they have different chemical properties in some respects. The main difference you need to know about at Higher is that aldehydes can be oxidised into carboxylic acids, but ketones can't.
It's the same with alcohols, they have different names because they act differently. :smile:

What he said about the alcohols is spot on. :smile:

You mentioned trouble with calculations, feel free to make a few threads asking questions. ScotQuals has a plethora of scientists willing to help. :tongue:

That too. I'm doing a science degree so I'll be willing to help out with sciency things. :biggrin:

He?

Reply 32

Original post by badumdumtscht

That too. I'm doing a science degree so I'll be willing to help out with sciency things. :biggrin:

He?

****? She?

I've seen you posting about since I've joined the site and I've genuinely always thought you were male. My bad. :colondollar:

Reply 33

Original post by Hype en Ecosse

Yep, badumdumtsch beat me to it. I thought I'd add a bit in.

When it's on the end of a carbon chain, it's called an aldehyde (aka an alkanal), and when it's somewhere else in the middle, it's called a ketone (aka an alkanone), like he said. The reason chemists call them different names is because they have different chemical properties in some respects. The main difference you need to know about at Higher is that aldehydes can be oxidised into carboxylic acids, but ketones can't.
It's the same with alcohols, they have different names because they act differently. :smile:

What he said about the alcohols is spot on. :smile:

You mentioned trouble with calculations, feel free to make a few threads asking questions. ScotQuals has a plethora of scientists willing to help. :tongue:

Oh thanks both of you. Do you have any tips on last minute revision for chemistry.
Units 1 and 2?

And you just made the kind of mistake that a woman never forgets!!! :tongue:

Are you male btw??

Reply 34

Original post by Ayesha.Tabassam95

Oh thanks both of you. Do you have any tips on last minute revision for chemistry.
Units 1 and 2?

And you just made the kind of mistake that a woman never forgets!!! :tongue:

Are you male btw??

Male. Yep.
I can only hope that she'll ever forgive me. :sadnod:

I'd make sure you know all your types of bonding, why molecules have that type of bonding, and what the physical properties associated with that type of bonding is.

You'll get questions about mole ratios. Like "How many atoms are present in 1g of H₂" in a multiple choice question. Or something like:
"In a mixture of CaCO₃ and Na₂CO₃, there are 0.6 moles of carbonate ions, how many metal ions are present in the mixture?"
People mess up on these types of questions all the time, but they are honestly so easy. It's just proportions!

Make sure you can identify your functional groups, you should be able to look at a molecule and tell me if it's an alkane, alkene, alkanoic acid, aldehyde, alcohol - whatever! You should know reactions associated with these too, combustion, addition, condensation, oxidation, all of those!

Know your examples of polymers, I always forgot these, but you'll probably get a question about them and their properties.

Kevlar, Nylon, poly(ethenol), poly(ethyne), biopol and PVC.

You'll need your fuels and alternative fuels, too. How you can obtain them and what the products of their combustion is, advantages and disadvantages to this kind of fuel.

Emm...your biochemical molecules such as proteins, amino acids and fats & oils you'll need to understand too!

And last but not least, your dreaded calculations. Hess's Law, Percentage Yield, Molar volume, all of those. :tongue:

Calculations are just pure practice, just find some lists of them and practice them! Remember your formulas for them, real easy.

As for everything else, I can only advise revising them the way you learn best. I'd do past papers then clean up on the stuff that I don't know by reading through my notes, or writing little summaries out.

Hope I was some help. :tongue:

Reply 35

Yes you were... Helped to depress me even more :tongue:

No im kidding. Thanks and do you know the polymers do you have to know an example for EVERY one that you listed?

Reply 36

Original post by Hype en Ecosse

Male. Yep.
I can only hope that she'll ever forgive me. :sadnod:

I'd make sure you know all your types of bonding, why molecules have that type of bonding, and what the physical properties associated with that type of bonding is.

You'll get questions about mole ratios. Like "How many atoms are present in 1g of H₂" in a multiple choice question. Or something like:
"In a mixture of CaCO₃ and Na₂CO₃, there are 0.6 moles of carbonate ions, how many metal ions are present in the mixture?"
People mess up on these types of questions all the time, but they are honestly so easy. It's just proportions!

Make sure you can identify your functional groups, you should be able to look at a molecule and tell me if it's an alkane, alkene, alkanoic acid, aldehyde, alcohol - whatever! You should know reactions associated with these too, combustion, addition, condensation, oxidation, all of those!

Know your examples of polymers, I always forgot these, but you'll probably get a question about them and their properties.

Kevlar, Nylon, poly(ethenol), poly(ethyne), biopol and PVC.

You'll need your fuels and alternative fuels, too. How you can obtain them and what the products of their combustion is, advantages and disadvantages to this kind of fuel.

Emm...your biochemical molecules such as proteins, amino acids and fats & oils you'll need to understand too!

And last but not least, your dreaded calculations. Hess's Law, Percentage Yield, Molar volume, all of those. :tongue:

Calculations are just pure practice, just find some lists of them and practice them! Remember your formulas for them, real easy.

As for everything else, I can only advise revising them the way you learn best. I'd do past papers then clean up on the stuff that I don't know by reading through my notes, or writing little summaries out.

Hope I was some help. :tongue:

Whats Hess's Law??!

Reply 37