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[sangsaracycling]

ibintrouble reblogged your link and added:

I see your IB May 2015 exam countdown and raise...

is that the November 2014 one? I took an exam in May (anticipated) and our results have been out since july..

[ibintrouble-blog]

November 2014 IB graduates…

How many have we got out there? 

Your results will be released soon! (Jan 6 12:00 GMT)

How are you feeling? How did the exams treat you?

If you have any questions about accessing your results or anything else, we're happy to help!

Good luck!

IBintrouble team

[ibintrouble-blog]

IB CHEMISTRY LIST for 2015 Examinations Part Two

Once again, we cannot reiterate what we mentioned in the previous list post, you MUST learn your definitions word-for-word and the understanding sometimes gets a little easier. We can put up a list of all the definitions you MUST know if someone tells us that it's needed! :P Here is a general list of all the things that typically come up and you must have a good idea about. Your learning should not be limited to this list, but you ought to have a good foundation and knowledge if you memorise about 3 or so bullet points for each idea. We've only done bonding today otherwise the post will be enormous. This is a big topic as like Org Chem, it fits in the CORE of all the other topics, so try as best as possible to learn the concepts and understand because it fits with the other knowledge (energetics, organic chemistry, redox etc).

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Here it is:

Bonding: 

• Ionic Structure

- definition - you must know this word-for-word (this helps you know how and why it forms - if you've memorized your definition of electronegativity, this will make a lot more sense to you).

- Electrostatic attraction - know its basic ideas and definition.

- state physical/chemical properties/bond length and strength

- understand the concept behind WHY they have these specific properties

- understand lattice enthalpy, reaction and non-metal/metal characteristics

- have a few examples of lattice structures (they compact).

• Covalent bonding

- definition (as with ionic). Know about diatomic.

- Electrostatic attraction/electronegativity =  know basic ideas and definitions

- state physical/chemical properties/bond length and strength

- understand the concept behind WHY they have these specific properties (two bullet points for each property and consider why one might be stronger than the other because of these factors [this comes into periodicity])

- understand complex structures, reaction and non-metal characteristics

- have a few examples of large structures and their strength

- know about H-bonding/definition and understand its significance

- draw a grid and have at least 5 good bullet points that explain the difference of Diamond, Graphite and Fullerenes (you could extract these from past questions and mark schemes as its a common question to compare).

- SILICON DIOXIDE AND CARBON DIOXIDE! KNOW ABOUT THEM. 5 good bullet points of why they differ and 5 on how they are similar! SUCH A COMMON QUESTION!

• Intermolecular forces

- VDWS or London-Dispersion forces etc - definition and what they do. Have a general idea

- H-bonds and Dipole/dipole attractions - understand them and be able to identify (any of the FON's make H-bond etc). 

- have a few bullet points on each about their physical/chemical factors in molecules and how useful they are (IB usually asks about melting/boiling points and density etc so you need to know which is stronger and WHY).

- Like dissolves like - this is your life, KNOW THIS ONE! 

• Metallic bonding

- definition - do not forget delocalised and attraction and sea of positively charged particles/ions/protons etc and memorise it!

- learn conductivity and why

- malleability - understand the concept but it's not too important. Maybe about 3 bullet points on this at tops. 

• Physical Properties

- have a table (very useful) of the different physical properties of each bonding type.

- melting point/boiling point/volatility/malleability/viscosity/giant covalent network?/lattice structure/intermolecular forces/solubility/electrical conductivity.

- with the above properties, have a little 'high,' 'low,' 'conducts,' 'doesn't conduct, - insulator' kind of table and try to digest all of that and learn it. It's a lot, but it's good to condense it.  

• Shapes of molecules and ions 

- understand VSEPR theory (you do not need to memorise it).

- understand bond angles and electron charge regions (1 = linear etc). 

- generally you must learn these and there isn't much of an easy way to do it. Learn tetrahedral etc and all its little parts like trigonal planar, bent, linear etc. There is usually ALWAYS a question.

• Hybridisation

- definition - so important.

- tetrahedral = sp3/ trigonal planar = sp2/ linear = sp (this just needs to be known.) Also single bonds = sp3/ double bonds = sp2/ triple bonds = sp

- define a sigma/pi bond and be able to identify their positions. 

- single bonds have sigma

- double bonds have a sigma and a pi

- triple bonds have a sigma and two pi

• Delocalisation

- definition is not need but is useful for understanding

- be able to identify ozone/benzene as having delocalised. 

- explain why bond lengths/strengths are similar or the same because of delocalisation etc

- often it will ask why these two A/B molecules have the same energy or such and the answer is delocalisation of electrons so keep that in mind.

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That's all for Bonding, but it is essential you understand most of it. If you don't understand this type of bonding, you may lose marks in an energetics/redox/organic chemistry question because they ask specific to their properties and functions which sometimes comes under their bonding type. 

Energetics will be up tomorrow! Any questions or syllabus 'lessons' can be requested in the ask! :-)

Good luck! :P

[ibintrouble-blog]

"IB is like constipation; when shit gets hard, it might seem like a waste of time. You just have to push a little bit more and in the end you'll be OK."

–– IB graduate/teacher (just now in an IB English Tutorial)

[ibintrouble-blog]

What TOK title would you like us to write a draft essay for next?

Trying to get a little schedule here and we want to cater to what is needed! Message us! :-)