Recent content by Virogen

Well it's only high school so we let them air dry overnight (and it's a low humidity climate). It seemed very dry and flaked easily. Combined with the idea that it may not all be pentahydrate could possibly account for it. Do you have a better suggestion for a percent yield lab? Also...

Any ideas what the inherent flaw in this experiment is? Homework Statement In the lab (actual lab), we combined copper(II) sulfate pentahydrate with barium nitrate to form barium sulfate (precipitate). Every group got a 115% or higher yield than stoichiometry would predict. Ba(NO3)2 +...

Can anyone explain to me why this is a molecule? The difference in electronegativity is larger than 2.0 on the Pauling scale - it should be ionic?

I am not sure why you chose to say this - it is insulting. You do not know how I teach... You yourself recognize these things may exist in the future in your reply. Compare the world 50 years ago to now. My students will have a good 50 years still ahead of them once they graduate, and you...

Exactly! It's not my job to limit them! I appreciate what you are saying - though I fundamentally disagree. Even though something is difficult and years away from realization, I believe it is perfectly valid to build the foundations for its realization today. It is not my job to go up and...

I completely agree with you saying children are born scientists :) Certainly most of my science classes involve investigation and my students have shown in many ways they love my science classes. But (and we're talking Jr. High / Sr. High here) we of course focus on discovering what is already...

I am not sure how any scientist could say that stopping ageing would not be possible. It's a biological process that very likely can be manipulated - even nanotechnology might someday produce machines that are able to regenerate cells indefinitely. Something like that has incredible...

I certainly don't have full understanding of many of these topics. Each topic is something that one could dedicate years of study towards. I am not going to teach these topics, but I want a list to serve as inspiration for students who might want to pursue these areas of research.

I think the list is more about technologies or discoveries that would revolutionize the world and/or our understanding of the universe and/or solve a problem that human civilization has. I think there is a lot of research into manipulating apoptosis, which I think encompasses this. Good...

I am preparing an inspirational list for my students in the hopes that some of them will take up these challenges. I was hoping I could get some more suggestions. Holy Grails of Science: - Grand Unified Theory - Featherweight Solar or wind - Solar Pavement - Beamed Power Propulsion -...

I was reading WikiPedia's entry on this, and there was one paragraph that surprised me: E = mc2 has sometimes been used as an explanation for the origin of energy in nuclear processes, but mass–energy equivalence does not explain the origin of such energies. Instead, this relationship merely...

How odd, the IB program seems to be using the older system...

I have encountered different naming systems in textbooks. Ignoring cis/trans, for example, some textbooks would give the name 2-butene, while others give but-2-ene. Are they both acceptable? The newer textbook uses the second type of naming, while the older textbook uses the first...

I mean electronic devices (opposed to electric devices) as ones that use current in computations or storage.

Hi, Would I be correct in saying that we do not use AC current in electronics because in the circuits, the presence of current would be a "1" and no current would be a "0". Thus with DC on = "1", off = "0". With AC, the current becomes zero 60 times a second (for 60 Hz) and thus would not...