VCE Chemistry Question Thread

[Adequace]

Can someone clarify this for me, my teacher says there are intermolecular forces (dispersion forces) in diamond, but from googling there apparently aren't?

[JellyBeanz]

Can someone clarify this for me, my teacher says there are intermolecular forces (dispersion forces) in diamond, but from googling there apparently aren't?

Going to have to disagree with your teacher here. Diamond is made up entirely of carbon atoms, each carbon atom being bonded to four others to create a large covalently structured network. These covalent bonds are the only bonds that make up diamond's structure.

[@#035;3]

Dispersion forces are present in all molecules..

[JellyBeanz]

Dispersion forces are present in all molecules..

That's true, but diamond is effectively just one giant molecule.

[Adequace]

Thanks JellyBeanz.

[blacksanta62]

Going to have to disagree with your teacher here. Diamond is made up entirely of carbon atoms, each carbon atom being bonded to four others to create a large covalently structured network. These covalent bonds are the only bonds that make up diamond's structure.

+1 Jelly. Would like to add that there not intermolecular forces of attraction (the covalent bonds) rather intramolecular forces of attraction. But the dispersion forces are intermolecular

Edit: Just added for clarification

[blacksanta62]

If anyone could help me with these questions I would be grateful

1) Br2 is added to propene resulting in an addition reaction. What do we call these kinds of hydrocarbons? is it correct to just say they're modified hydrocarbons? Or does it have to do with unsaturation?
2) If a molecule has a C=O and C-O as well as a C-H and no -OH peak on the infared specturm, is it correct to term the molecule as an ester?
This is more of a question which slips my mind: What are some actual uses of chemical analysis?
Thank you

[Swagadaktal]

If anyone could help me with these questions I would be grateful

1) Br2 is added to propene resulting in an addition reaction. What do we call these kinds of hydrocarbons? is it correct to just say they're modified hydrocarbons? Or does it have to do with unsaturation?
2) If a molecule has a C=O and C-O as well as a C-H and no -OH peak on the infared specturm, is it correct to term the molecule as an ester?
This is more of a question which slips my mind: What are some actual uses of chemical analysis?
Thank you

1) It's a halo alkane, these entail Chlorine, Iodine, Fluorine and Bromine
2) Yeah generally speaking this is the case. However, it would just give you an infrared spectrum by itself, it would give you other information in conjunction. Analytical techniques are used in culmination and not used singularly.

[blacksanta62]

1) It's a halo alkane, these entail Chlorine, Iodine, Fluorine and Bromine
2) Yeah generally speaking this is the case. However, it would just give you an infrared spectrum by itself, it would give you other information in conjunction. Analytical techniques are used in culmination and not used singularly.

1) Cool
2)Yeah, there's a HNMR and MS spectrum. to help identify the molecule. 3 H environments and M(molecule)=88

[@#035;3]

so its ethyl ethanoate?

[blacksanta62]

so its ethyl ethanoate?

Don't have solutions but that's what I worked out aswell

[knightrider]

My school has skipped this chapter(as attached).

What things are important from this chapter for chemistry 3/4 . What exercises from this chapter  do you guys recommend i do?

Thanks 

[sweetiepi]

My school has skipped this chapter(as attached).

What things are important from this chapter for chemistry 3/4 . What exercises from this chapter  do you guys recommend i do?

Thanks 

Basically what aspirin is (acetylsalicylic acid) and how it made, including the salts, as well as the pathway to make 'greener' drugs.

[sweetiepi]

I also recommend doing questions from pages 235-238, however these don't exactly reflect the VCAA exams...

[knightrider]

Basically what aspirin is (acetylsalicylic acid) and how it made, including the salts, as well as the pathway to make 'greener' drugs.

I also recommend doing questions from pages 235-238, however these don't exactly reflect the VCAA exams...

Thanks so much sweetiepi