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I don't understand your chemistry teacher.

i honestly cannot say ive met a white(and ive known quite a few) who is smarter than me. or even within an inch or two within my intellectual level.

Amphoteric oxides are not in the syllabus. AmphIPROTic substances are.

Yes, heat it to the same temperature then. You can still make the change in temperature = 15. But that would mean that you're burning less ethanol than methanol. Note the difference between ΔH and ΔHmolar ΔH is merely the heat change of the thing you heated. It doesn't tell you anything else...

Well, if it really was a typo of Na2 instead of Na, you should still know that NaOH is not a weak household cleaning base.

I think that's considered a physical factor, not chemical.

1) What do you mean by "would bond with a co-ordinate covalent bond"? You mean, which of those would form co-ordinate covalent bonds with other materials? Or Which one of them are bonded by co-ordinate covalent bonds? 2)Fractions...? Umm... I'm not sure what they mean, but I'll take a guess and...

a) Na2X + 2HCl --> 2NaCl + H2X (Charge of X is 2-, as deduced from the substance Na2X. Since molar ratio of Na:X is 2:1, and charge of Na is 1+, then X must be 2-) b) Moles of HCl required in titration = 0.25 mol/L x 0.024 L = 0.006 mol Therefore 0.003 mol of Na2X required (molar ratio 2:1)...

The mass of the copper can is not included in the calculations. If that was the case, what made you think that you didn't have to include it into the calculations when using a glass beaker? You must remember than in the equation ΔH= -mCΔT, that: m stands for the mass of the object that you are...

lol, many of my friends understand chemistry concepts when I use slightly humorous analogies xD

ΔH= -mCΔT Since PI is in excess, we do not need to take into account the molarity of PI. But since it's in 30 mL solution, it adds onto the heat sent into the solution. Thus, the mass of the solution is 50mL + 30mL. For calculation purposes, take 1 mL = 1 gram (They will never expect you to deal...

I'm guessing it kinda goes like this: You have to remember that fertilisers aren't uniform in concentration. There are areas where there is more mass of sulfate, and there are areas where there are less. Imagine yourself making Chicken Caesar. If you take 1 spoon of it, there is a huge change...

Well the definition of an isomer is just any substance with the same number of atoms of specific elements, with a different structural formula.

Yes. Ethyl Butanoate.

What are you referring to? Why they only exist as hydronium ions, and not H+? Well, my explanation of WHY it has a strong hydrogen bonding (might not be correct, but sounds logical to me) is that since hydrogen ions have the lowest electronegativity (it is only a single proton), then it will...

It's a shit one to use because it's deliquescent. Undermyskin, I challenge you: If you have a pH 3 acetic acid solution and a pH 3 HCl solution, predict which one will require more alkaline solution to neutralise it in a titration.

~55.95% of all HSC candidates, I believe.

How can you do these without substitution =\ I'm so noob xD

You'd get marks for either. But in reality, H+ ions cannot exist on their own. They always come in the form of H3O+. I think it's something to do with Hydrogen's low electronegativity, but I'm not 100% sure.

I don't like CSSA papers. They spam 5/6/7 mark questions about stuff that are learnt through pure memorising. You know, the kind of questions that a good English/humanities student would do better.