Chap

Cannot homosexuality be the result of a recessive gene or set of genes surviving through the ages? Compare this with the case of an albino animal. In humans as well as in many other vertebrate species, there are several albino organisms existing within that species. They exist, even though they are at a disadvantage in the wild (obviously humans who have albinism are not at such a disadvantage because we don't live in the wild). Just like that, isn't it possible that the genes which may (directly or indirectly) lead to homosexuality be present within the human-gene pool, affecting only a small number of humans at a time, but present, nevertheless?

find the number of moles of methlybenzoate(let's call the result A). Then find the number of moles in 5cm3 of NaOH(let's call the result B). Write out the balanced reaction equation between NaOH and methlybenzoate. Use the ratio between the methylbenzoate and NaOH to calculate the number of moles of NaOH required to react completely with the methlybenzoate (result A). Check whether this result is greater than B. If so, NaOH is NOT in excess.

Question: The compound P has C,H,O and N as elements. A white pp+ was formed when P was acidified. Identify a structural feature of P which caused this precipitation. I was thinking on the lines of: maybe its an ammonium salt of long chain carboxylic acid [e.g.- (CH)5COO-(NH4)+]. When a strong dilute acid is added, the carboxylic acid will be formed and since its a long chain molecule, it will precipitate out of the solution? Am I right or is it some other obvious compound? Thanks for answering.

Which part of the Buunsen burner flame is oxidizing? According to wiki.answers and my university course book, it is the 'Inner cone': http://wiki.answers.com/Q/Oxidizing_zone_in_the_Bunsen_burner_flame but according to the following websites/files, it is the outer cone: http://eso.vscht.cz/cache_data/1061/www.vscht.cz/ach/pub/LAChI-manual.pdf http://chemistry.about.com/library/weekly/aa010102a.htm This is not homework, I'm studying for my finals and this got me confused.

yes, anode is (+) and the cathode is (-), I didn't make a mistake on the electrodes. Also, I don't think oxygen evolved at the anode (+) since the solution was almost saturated with NaCl. It is the cathode which eroded and not the anode. I did collect the gas that evolved from the anode and it is definitely chlorine gas (it had a slight yellow green color and pungent odor). I don't know whether it's possible for some oxygen to have evolved, but that's beside the point since it's not the anode which eroded, but the cathode. This is the puzzling question. As for the brine solution that I am using, it is table salt brine not sea-water brine, but a slight precipitate still forms. I'm living in Sri Lanka (a developing nation), where salt is extracted from the sea. I'm not that aware of the exact refining process employed by our country, but maybe the table-salt in Sri Lanka s not as refined as table-slat in developed nations.

I electrolysed a brine solution using graphite electrodes. No attempt was made to minimize the chlorine (produced) reacting with the electrolytic solution. After a few hours, a white sludge (possibly Mg(OH)2 and Ca(OH)2) was formed, as expected. This was removed and the electrolysis was continued. After a few hours, the graphite cathode started to flake off. The anode remained intact. This is surprising since I don't think hydrogen reacts with carbon under these experimental conditions. I initially thought maybe the Chlorate ion formed due to the dissolution of chlorine in the solution reacted with the graphite cathode, but that doesn't explain the fact that the anode remains intact. Have I overlooked a simple fact?

Thank you for your replies!

Iron is probably the only catalyst used in the Haber process, today. Why aren't any other transition metal catalysts used for this process? osmium and ruthenium aren't economically feasible, but what about other transition metal elements such as Nickel or Copper? Is there a specific reason why Iron is the most suitable catalyst for this process or is iron the cheapest substance that can be used for this process? Another fact to consider is; Iron is one of the chief components in nitrogenases, the group of enzymes used by particular biological organisms to convert dinitrogen into ammonia. Is it probable that the biological organisms use iron in their enzymes because evolution has proved it to be the one of the most efficient catalysts compared to other transition metal elements? I would like to know your views. Thanks.

A stream of water falling down a faucet will experience the force of gravity which makes it accelerate. As its velocity increase, in order to conserve its volume, the stream will get narrower, as it travels down. My question is; is that the only reason why the stream gets narrower when it is falling from a faucet? Water molecules can form relatively strong hydrogen bonds and also the stream experiences air resistance. Don't these forces also contribute to the stream of water getting narrower as it flows down? Thanks.

You seem to have brought another perspective to the argument. I should think about that one; the distinction between artificial and man-made.

Take genetically engineered tomatoes for example. The genes are modified yes, but the plant grows similar to a natural tomato plant, obeying the same basic laws of nature (photosynthesis, transpiration, growth ect..). However, the product is not exactly natural. So, can the product be categorized under the man-made section or natural section? If you deduce that the answer is "both"; then there is another question: What about other "man-made" materials in our world. Take the laptop for example. Yes, certainly man assembled the parts together, but the whole process had to obey the laws of nature. The parts had to be fitted according to natural laws; so that the whole thing would work. We call these things man-made because man used his intelligence to combine his labor with materials in "a state of nature" (such as iron ore or crude oil from which plastic is made) to make new products. Which is what is happening in genetically engineered tomatoes as well. Man combines his labor with a cell of a natural tomato and makes it into a product. These are just my thoughts on the subject. I may be wrong; and if so; I'm glad to be corrected. I appreciate everyone's thoughts on this subject. Thanks.

There seems to be some controversy around this topic. I initially thought that it's the gyroscopic effects keeping it upright ( which was supported by the fact that a bicycle may roll downhill by its own), but then I met the argument that those effects are not very strong. I agree with this argument because I think the gyroscopic effects felt by the bicycle is sufficient enough to support a riderless bicycle, but not one with a rider. I mean, a bicycle just weighs a few kilograms, but I weigh 60kg! So the effect it not powerful enough to support me. Am I correct? I came across another theory that; "our brains learn to keep the bicycles upright by making necessary adjustments unconsciously to balance the bicycle." I partially disagree with this theory since I don't believe that our brains are responsible for the whole balancing act without any help. If this theory is true, I should be able to keep a non-moving bicycle upright. I can't balance a non-moving bicycle for more than a few seconds (no matter how much time I spent practicing) , but I can ride for hours on a moving bicycle. I'm sure something else is involved, but can't exactly find it. I would like to know your views. Please state it in simple terms; I'm a biochemistry undergraduate; physics is not my area of expertise. Thanks.

thanks. Your dictionary is really helpful!

The SIMPLE reason why plants are green is that it didn't need to be any other color! Evolution of an organism depends upon the selection pressures that the organism experiences. So initially the chemical chlorophyll would have evolved in plants, which doesn't absorb green light. Why didn't some chemical which absorbs all light, even green light (let's call it blacknophyll) evolve? Well, as others have pointed out, chlorophyll might have been a simpler molecule (which can absorb just the right amount of energy without breaking a apart) than "blacknophyll". However, down the evolutionary line, there was very little need (selection pressure) for the plants to evolve a completely different kind of molecule, to capture light better. Any inefficiencies in leaves (with respect to capturing the light energy) of primitive plants would have been eliminated (or minimized to significant degree) by simple evolutionary traits, such as increasing surface area etc... But the process was never SO inefficient that a whole new molecule needed to be found. Instead, the selection pressures put on plant were mainly based on factors like reproduction and growth. That's my thought on this. I welcome any corrections on this post; from anyone.

Yes, you are right. The article provides experimental data showing that in most cases; the solar cells are much more efficient than photosynthesis. The reason for this (according to the research article) seems to be that plants never evolved to have the highest efficiency rate in capturing the sun's energy. Instead, the selection pressures experienced by plants have been mostly on reproduction and growth. However, it may be possible to genetically modify the "leaves" so that they can capture much more light energy. So it is a future possibility. I guess.