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I know for Tc-99m, it's non-reactive with body cells I think...

My question: How many units do you do?

No, he's wrong. HCl is stronger. The first ionisation of H2SO4 is strong, and the 2nd is weak. HCl has only got 1 ionisation, and it is strong, so overall HCl is stronger. But in the same conc. and volume of acids, H2SO4 would have more H+ ions. I doubt they'd give you a question on this...

Oleum. *Increases reliability*

Yeah, you can try. I read my friend's 4u notes on complex numbers just for fun, and I understood them (I do 3u) The further you get ahead of everyone in the HSC, the better. It's best to finish the course early, and leave plenty of time for revision.

Depends how good you are at each. If only a little better in bio, then keep chem. If you're doing quite well in each, then drop music. Music has the lowest scaling of all.

Unless it specifically says Copper (I), you must always assume it is Copper (II). That goes for most, not all, transition metals as well.

It's actually quite a typical calculation question for such value of marks.

I think it's the one by the Royal Australian Chemical Institute.

Best way to do these are to do it backwards from the information they gave. HCl + NaOH --> NaCl + H2O So the number of moles of NaOH that reacted to neutralise the HCl would be: 0.1 x 0.0142 = 1.42x10-3 mol Therefore 1.42x10-3 mol of HCl was excess Initially, 0.025 x 0.6 = 0.015 mol was...

It's called rationalising. You should've done this in year 10... No offense, but this is very basic stuff =O basic knowledge expected out of a 3u student. Times top and bottom by (3-√2). 3+ √2 - 1/(3 + √2) = 3 + √2 - 1(3-√2)/(3+√2)(3-√2) = 3 + √2 - (3-√2)/(3-2) = 3 + √2 - 3 + √2 = 2√2

Re: Tiiiiiittttttttrrraaaattttttttiiiiioooooonnnnnssss sssss!!!!!!!! Basically you gotta write the equation for the neutralisation reaction, then balance it. Then calculate the moles of the standardised volume of acid/base you used. Then according to the molar ratio of the equation...

Read point 5 again xD and try to understand it =P

Atmosphere: Air- Nitrogen, oxygen, argon (those are the majorities, some other gases are present) Biosphere: Blood- Iron, carbon, oxygen, nitrogen etc... Lithosphere: Rock- silicon, CaCO3, etc... Hydrosphere: Ocean- NaCl, KCl, CaCO3, etc...

Let's see... Year 11: Adv eng, 3u maths, physics, chemistry, biology, economics Year 12: Adv eng, 3u maths, physics, chemistry, biology. Adv eng got shittier, 3u maths became more interesting, but also introduces you to some shit boring/hard topics, physics becomes shit boring, especially...

What the shit, you're forgetting mass dilation... Also, you're only an HSC physics student. There are many things that you've yet to learn about. In other words, your 'physics knowledge' is insuffice to pose a question to the deeper levels of 'real physics'. What makes you think that out of...

The metal displaced the metallic ions in the solution, I guess. You can tell which metal "became solution" (technically called oxidation) by comparing the standard electrode potentials of the two specimen. The higher value of the two when acting as a reductant (losing electrons) is the metal...

If her parents aren't UBER UBER strict, have her tell them that it's a "formal partner", not a "date". Have her say stuff like "but it'll be fun! I've never been to the formal before, and I want to see how it's like" And....15/17 isn't bad............. ...As long as you don't sleep with her.

Number each red part with numbers. 1/2: It's not about having more or less electrons. In a covalent bond, the two elements still share the electrons, regardless of electronegativity. It's true that the more elctronegative element will pull the electron towards its own nucleus more (and hence...

Repeating doesn't happen in Australia. But if you're failing so badly in 2u, I suggest you do General Mathematics. It would be more beneficial to your HSC, and will maximise your UAI.