Also, in H-NMR, if the adjacent H on adjacent carbon atoms are in the same chemical environment (say a cycloalkane for example), is there any splitting pattern. If not, what about when the chemical environment is only slightly different, like for 2 adjacent CH2 groups in an octane molecule. Would it then be a splitting pattern with a tiny chemical shift either side?

And more importantly, does VCAA care? Thanks again.

    Jesus
    That's precisely the reason VCAA doesn't ask you the states of the H3PO4 catalyst since people can debate forever about whether it's (g) or (aq). You should always write H2O (g) though

    Jesus
    Hs in the same environment don't split each other, so for cyclohexane, you'll just see a singlet that integrates to 12

    Slightly different chemical environments do produce splits. The width of the split doesn't matter since you only deal with 3J coupling in VCE chem

          Does VCAA care if we do not specify something implied during naming of a compound?
          Eg. Propanone is obviously propan-2-one

            Will I'm pretty sure if you write something unnecessary like ethan-1-ol it will be marked wrong. But we will have to see what Bilzene says

                Will
                Great Question Will! I'm not sure, but would like to know was well 🙂

                I wonder if it applies for the prefix as well (eg. "methyl ethanol"); Or would you need to write '1-methyl ethanol'....

                Jesus Surely not... That'd be really mean of VCAA.....

                    Will I'm sure Billzene will be able to give you a better answer since I'm a bit out of touch with VCE chemistry, but I am pretty sure that the numbers are not necessary for compounds that are implied. For example, no need to write propan-2-one, propanone will suffice (but you actually don't need to know how to name aldehydes and ketones for VCE chemistry anyway)

                    Jesus
                    You wouldn't lose marks for writing this.

                        Will
                        It's super inconsistent. I got a mark taken off on a SAC for writing propan-2-one due to the redundant number, but when I omitted it on my exam, I got a mark taken off there. This might be bad luck since the students I tutor never lost a mark on their exams for including or excluding a redundant position number.

                          Hey Billzene,
                          Do you know if we need to know which amino acids are essential?

                            Will
                            You absolutely don't. They'll tell you in the question if an amino acid is essential or non-essential

                              13 days later

                              hey
                              for this questions write an equation that shows hso4- acting as base in water. Would it be. Thank you

                              h2so4 + h20 = hso4- + h30+

                                chemistry1111
                                You’re showing H2SO4 acting as an acid, not HSO4- acting as a base. Remember that bases grab H+ i.e. they neutralise (remove) H3O+ instead of making more H3O+

                                  hamna_fa
                                  Hi!

                                  Edit: I'm completely wrong... Mybad! See Will

                                  Presuming the standard solution is used to make the titrant/aliquot; here's my understanding!

                                  - This would mean that the concentration would have been artificially decreased (as the titrant would be diluted).
                                  - This would mean there would be an overestimation of aliquot added.

                                  • Meaning the concentration measurement would be greater than the real value.

                                  Hope this helps!

                                      Is the volumetric flask not supposed to be rinsed with only deionsied water?
                                      It says the "accuracy of the standard solution", so I'm assuming the volumetric flask is used to make the standard solution. If so, it should be washed with water regardless, as water is added to make these, and it is filled up to a certain point in the beaker.

                                      The only thing that is washed with the solution which will go in it is the burette and the pipette, right?

                                        Will
                                        This is correct. You're filling the volumetric flask with water anyways so it doesn't matter if there's some residual water left. The other glassware you wash with distilled water is the conical flask

                                          hamna_fa
                                          It's OK since you're going to add more water to the Na2CO3 in the volumetric flask anyways

                                            Christ It disrupts the H bonding in 2˚ and 3˚ structures of proteins with its hydroxyl group

                                              Greetings,

                                              For mass spectroscopy, do we need to know how to write the equation which produces the parent molecular ions and base peaks?
                                              I saw it on a VCAA 2010 exam, but not sure if it's within the scope of the new study design.
                                              And if so, could anyone provide an example of how you would write it?

                                              Thanks,

                                              Your Lord

                                                Lord I don't think you need to in the new SD. If you're curious, it's M + e- ---> M+ + 2e-. Some people choose to show it with a radical ie M+. but I don't