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

                                                5 days later

                                                Hey guys I have a question.

                                                So I'm doing a gravimetric analysis task tmr where we have to look at the % of sulphate in fertilizer and compare it to the manufacturer's claim.

                                                One of the steps in the experiment is to grind the fertilizer and then mix it with both HCl and distilled water. Then we boil and add barium chloride to form a precipitate.

                                                I was just wondering what the role of the HCl was.