Chemical bonds that we need to be aware of for the unit 3 exam

[soccerboi]

These are what i could think of:

- Ionic bonds: Between a metal and a non metal. Positive and negative charge.
- Covalent bonds: Sharing of electrons between non metals. Could be equal or unequal sharing.
- Dispersion forces: weak forces of attractions( in everything?)
- Ion dipole bonds: Between ionic and polar compounds
- Dipole Dipole bonds: Between polar molecules. Weak positive charge on one molecule and weak negative charge on another.
- Hydrogen bonds: Between H and N,O,F.
- Metallic? <--- don't need to know right???

Can anyone add anymore types of bonds we need to know and add anything to my basic definitions/ elaborate on their meanings?

Also if possible can someone list them in order of bonding strength?
Thanks a lot

[pi]

By metallic do you mean like a metallic lattice? I think you should know that, basically use something like "a metal (such as Fe) is structurally Fe cations in a sea of delocalised valence electrons"

[sunnylee]

Im not sure whether this is a separate bond itself or is included in the mentioned bonds but Disulfide bond/bridge is required for proteins/enzymes.

[thushan]

Im not sure whether this is a separate bond itself or is included in the mentioned bonds but Disulfide bond/bridge is required for proteins/enzymes.

That's right - and I think Unit 1 and 2 material is assumed knowledge - eg. look at Question 9 in the 2010 VCAA paper, which tested concepts from Year 11.

[charmanderp]

To be more specific, ether bonds, glycosidic bonds (make sure you know the difference between those two), ester bonds, phosphodiester bonds and amide bonds are covalent bonds which you have to know about.

[charmanderp]

Im not sure whether this is a separate bond itself or is included in the mentioned bonds but Disulfide bond/bridge is required for proteins/enzymes.

That's right - and I think Unit 1 and 2 material is assumed knowledge - eg. look at Question 9 in the 2010 VCAA paper, which tested concepts from Year 11.

Was that the question about bunsen burners?

[sunnylee]

To be more specific, ether bonds, glycosidic bonds (make sure you know the difference between those two), ester bonds, phosphodiester bonds and amide bonds are covalent bonds which you have to know about.

Could you state the difference between ether and Glycosidic bonds, because according to my textbook it states that they mean the same, (the reaction between two hydroxl functional groups) usually found in carbohydrates forming a disaccharide. Thanks~

[pi]

Ether bonds are defined as: R-O-R'

Glycosidic bonds (for the purposed of VCE chem) are between sugars: sugar-O-sugar


Hence, my understanding is that glycosidic bonds are a type of ether bond.

[Aurelian]

To be more specific, ether bonds, glycosidic bonds (make sure you know the difference between those two), ester bonds, phosphodiester bonds and amide bonds are covalent bonds which you have to know about.

Could you state the difference between ether and Glycosidic bonds, because according to my textbook it states that they mean the same, (the reaction between two hydroxl functional groups) usually found in carbohydrates forming a disaccharide. Thanks~

Structurally they are the same, you just call ether bonds "glycosidic" bonds when they're involved in joining two sugars.

[thushan]

To be more specific, ether bonds, glycosidic bonds (make sure you know the difference between those two), ester bonds, phosphodiester bonds and amide bonds are covalent bonds which you have to know about.

Could you state the difference between ether and Glycosidic bonds, because according to my textbook it states that they mean the same, (the reaction between two hydroxl functional groups) usually found in carbohydrates forming a disaccharide. Thanks~

Structurally they are the same, you just call ether bonds "glycosidic" bonds when they're involved in joining two sugars.

Actually, only one need be the sugar, the second doesn't have to be.

[charmanderp]

^this. A sugar and a CH group.

[pi]

I highly doubt they'd ask you to label a link as a "glycosidic link" in VCE chem that wasn't sugar-O-sugar though...

[charmanderp]

And when in doubt if it's a glycosidic bond or not, saying 'ether' should suffice, I do believe.

Do we have to highlight a glycosidic/ether bond even if the question doesn't ask us to label bonds? I've heard that we do.

[pi]

I don't see why you would label one if it isn't asked?


Just like when you solve an equation in Methods you don't also graph it too?

[charmanderp]

To be honest I'd say a more appropriate analogy would be pointing out key points on graphs, which I believe you're meant to do even if it's not mentioned in the question.

But yeah, it's just something I've seen in practice exam answers and such, and I think my teacher might have said it too. Thanks for clarifying (: