VCAA Chemistry Examination - AN Official Solutions (Draft 1)

[beastly101]

I'm a trollface.

Wait, I'm confused now, is it decreased or increased, lol.

[thushan]

Increase in temperature increases reaction rate.

In the qn nliu95 was referring to, that reaction in my trial exam is an EXTREMELY UNUSUAL one.

[LOLs99]

For Q 4 why can't it be B?

[Stick]

For question 9 is it possible to say
Mass spectrum
Molecular ion peak at 88, same mass as CH3COOCH2CH3

Infared
Absorbtion band at 1750, meaning a C=O bond

Proton NMR
3 hydrogen environments, which is true for CH3COOCH2CH3

Oh goodness, I wrote exactly the same. I think points 2 and 3 should be OK, but I'm iffy about point 1.

[Edward21]

For Q 4 why can't it be B?

That omits II which is used for a back titration. Eg. CaCO3 solid uses excess HCl, then that excess HCl is titrated with NaOH to determine the HCl reacted as a back titration is volumetric analysis, you can't do it directly if your compound eg. CaCO3 isn't soluble in water to begin with.

[LOLs99]

That omits II which is used for a back titration. Eg. CaCO3 solid uses excess HCl, then that excess HCl is titrated with NaOH to determine the HCl reacted as a back titration is volumetric analysis, you can't do it directly if your compound eg. CaCO3 isn't soluble in water to begin with.

Ah good point! thanks

[sandbum1]

could you say 500 nm??  for question about co2+ ions