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It all depends on relative energy gaps of filled and unfilled orbitals. Most metals (incl. Na, K, Ca, Sr, Ba) have energy gaps of filled and unfilled orbitals correspond to the energy of a photon, that is in the visible EMR range. Anions are usually not visible as the energy gap do not...

Picking bone from egg eh? ;) Actually there's more than 18, keep coutning affinity ^^ @vds: you are right, those are examples of (constitutional isomers)

astronomy, software design, project management, estimation, projection, modelling, warfare (arteliary), aeroneutical (wait, that's engineering)

Also to add to the point. Historically, only acids are placed in the burette, as base tend to ruin the plastic tap. So such restriction applies to modern titration equipments however.

We have stazi's name. We can go and stalk him now. I think scholarship is displayed. But I'll have to check.

Brings disadvantages to citizens who are expecting parcels. The parcels, which might not pose particular danger to the Australian environment, might still be rejected. Scientists undergoing biological studies may require biological samples from overseas, which *could* be considered dangerous...

Re: �*文�*�詞! They are not REAL asians... rl azn tipe lyk ziz edit: ok that was gay =(

Wow, elitist Stazi. I feel I've met you before my BoS hybernation. UNSW has lotsa money, yes. But it ultimately comes down to what course/faculty you are interested in, and what university has to offer. UNSW offer more flexible contact hours, and more scholarship, of course... USyd offer a lot...

What he said. Tis been a while since I last did impulse/momentum stuff.

First year uni phys stuff, almost forgetting. But when a charged particle accelerates, it emit EMR. ie, energy being emitted/lost by the electron. Due to the conservation of energy, itself must lose it's kinetic energy. This could be observed by the loss of the kinetic energy. But I...

Q3, I'm sure this question is a tricky one, since when a charged particle accelerates, it gives off EMR, hence it really should lose energy. But ignoring that, it shouldn't gain or lose any energy, since it's undergoing circular motion, and the tangential velocity won't change. Q4 P = energy...

Crumble zone is the front bit of the car, which is designed to (well) "crumble" when collision occurs. You could imagine that if you smash your head against a brick wall, you would experience concussion. But if a pillow would be between you and the wall, the injury you sustain would be less...

It was already taken into account I believe

Hmmm try this next time: Write out what you have (ie, if you have initial velocity is 5 m/s, wirte out u = 5 m/s, etc etc) Write out what you are after (say, final velocity, write v = ?) Look at the formulae, and with all the information you've gotten, try to find out as many things that you...

Question is wrong?

Huh? Conservation of energy. At the max height, GPE is at max, KE = 0. GPE at max = m x g x h = 32 m When rock was thrown, GPE = 0 (relative to the starting point), KE = 1/2 mv^2 1/2 mv^2 = 32 m v = sqrt (64) m/s = 8 m/s If you really want to be vigorous, use change of GPE instead of GPE...

Adding on to what fretsonfire74 said, technology allows scientists to map genomes of species, which, can be a good evidence in determining how "close" two species are on evolutionary pathways.

I don't read sacasm well. But... no? Neutralisation or self ionisation of water molecule. (If you read the equation in reverse). PS your equation is not balanced.

I guess Dry air would be the control... Although it would be better if one can exclude oxygen (immensing the nails in oil or something like that)

Re: �*文�*�詞! Damn... failed... Did I? At least I used proper grammar and spelling and capitalisating and all...