Science desk | ||
---|---|---|
< May 1 | << Apr | May | Jun >> | May 3 > |
Welcome to the Wikipedia Science Reference Desk Archives |
---|
The page you are currently viewing is an archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
Hello. If hydrogen bonds with a halogen, then is the compound ionic or covalent? For example, should I call it hydrogen fluoride (ionic conjugation) or hydrogen monofluoride (covalent conjugation), hydrogen chloride or hydrogen monochloride, hydrogen bromide or hydrogen monobromide, hydrogen iodide or hydrogen mon(o)iodide? (Astatine is the least reactive halogen but may react with hydrogen.) If hydrogen bonds with an alkali metal, then the compound is ionic. Right? Thanks in advance. -- Mayfare ( talk) 00:57, 2 May 2008 (UTC)
Can some one please tell me the price of nitrogen per specific measerment? i need the info for a school prodject. hear is an example: Nitrogen cost 12 dollars per gram........... —Preceding unsigned comment added by 76.14.124.175 ( talk) 02:47, 2 May 2008 (UTC)
Call your local "Welding supply" company and ask them; they can probably proide the price for both compressed gaseous nitrogen and liquid nitrogen. But I've heard that in bulk quantities, the price of LN2 is "about the same as beer".
Atlant ( talk) 17:35, 2 May 2008 (UTC)
Why does milk remove ink stains? —Preceding unsigned comment added by 222.153.234.166 ( talk) 07:26, 2 May 2008 (UTC)
Could someone please explain if these are separate concepts, or if not, which are synonyms. Could they all be put on the same page or do they each merit one? 71.236.23.111 ( talk) 08:10, 2 May 2008 (UTC)Lisa4edit
No, those terms are not synonyms, but obviously closely related. The term 'Biome' refers generally the largest unit including all the biotic community of an area. Hence basically it deals with the structural part of the living world, integrated by the fuctions of ecosystem. In contrarcy, the Ecosystem is system that integrates both the structural and functional aspects of the living world of a particular area. You can recognise the difference, if I say a Biome is well maintained standing Car either without fuel or driver. until the car starts rolling no work is done and we are unsure of the systems efficiency or even viability. As the fuel starts burning and the car moves it promotes some work and becomes a system. Henceforth, the biome become an ecosystem. There may be several smaller ecosystems in Biome itself. for example, in a Tropical Forest biome a few pond ecosystem, grassland ecosystem and forest ecosystem may be integrated. Next If I assume you are refering an 'Ecotope' as 'Biotope', then I can say an ecotope can be regarded as any piece of particular ecosystem, like a peice of garssland or a single wetlands etc. It is in fact a portion of a large biome, which have basically similar kinds of living environment. The margins of two adjacent ecotope, i.e. the transitional area of ecotopes is known as 'ecotone'. You should not confuse these three atall and they all have their own entities, so as the terms.
For further details on the issue, you may refer the book 'Fundamentals of Ecology' by O.P.Odum. - Dr.Rajarshi, India
A few questions about blood.
1) I'm looking for statistics/comparisions on how well blood acts as a conductor of electrcity. I looked at the blood article, and it mentions it contains electrloytes, but I'm looking for more information.
2) Building on the above question-could a person, drenched from top to bottom in blood, use this as a Faraday Cage? What I mean-He gives himself what would be a lethal electtric shock, but the blood acts as a Faraday Cage, leaving the person unharmed, but making it look as though he recieved the full shock.
I understand these are quite bizarre questions, but it is for this exact reason that I need help with them.
Thanks very much in advance. Cuban Cigar ( talk) 13:47, 2 May 2008 (UTC)
See this 1950 article (.pdf) for discussion of the conductivity of blood. - Nunh-huh 03:56, 3 May 2008 (UTC)
I have two questions about it. First, what makes activaed carbon "activated"? After reading the wiki article on it I'm a little confused as to how physical or chemical changes make carbon activated. Secondly, when it states that a gram of activaed carbon can have a surface area of 500 square meters, does that mean that if i streched out that piece of carbon it would cover an area that big? Thanks Deltacom1515 ( talk) 13:52, 2 May 2008 (UTC)
Ok, thanks. One down, one to go. Deltacom1515 ( talk) 15:26, 2 May 2008 (UTC)
Let clear the concept more lucidely. You can think of a honeycomb, when you have a piece of activated carbon (non-powdered form). As in honeycomb the wax are sread over the walls of wholes or cavities, the surface of which can not be spread out to assess the area, in case of activated carbons huge numbers of microspores are available, which can not be measured as spread sheet. The surface is known as BET surface, and is available for adsorption of gas molecules. In response to the other question, the activation perhaps refer to enhaced capacity of the carbon as a adsorbent material, due to enhancement in the effective surface area. But, there may be some further explanation beyond this. - Dr.Rajarshi
Another question in a similar vein to the previous one.
For How long can a person's heart completley stop before a person before it is irrecovably damaged to the extent that death is inevitable? I know it is in seconds-but how many? And what factors can change this? The heart article gives 2 seconds-but this makes me think of numerous cases who have been "clinically dead" for days, before magically reviving. So-for how long can a person stop their heart without dying? (Like to point I don't plan to do any of these things-I'm just really curious).
Thanks in advance. Cuban Cigar ( talk) 15:16, 2 May 2008 (UTC)
hello plese tell me about what are the various part of a robort machine and how i assemble it??// plese tell me the correct answer.. i am waiting for this.. —Preceding unsigned comment added by 59.98.104.100 ( talk) 17:11, 2 May 2008 (UTC)
I've always wondered why reporters (and even fire fighters) often say that, when they're fighting a wildfire, that if temperatures drop, it helps to fight the fire. How do cooler temperatures help in fighting wildfires? Corvus cornix talk 17:56, 2 May 2008 (UTC)
The extracellular matrix was said to be extracted from pig bladders.
Now, if this story were true, what would happen to his finger print? What are the chances that the regained tissues run amok and cause cancer? -- Toytoy ( talk) 20:29, 2 May 2008 (UTC)
One of the most encouraging signs that human limb regeneration is a feasible goal is the fact that our fingertips already have an intrinsic ability to regenerate. This observation was made first in young children more than 30 years ago, but since then similar findings have been reported in teenagers and even adults. Fostering regeneration in a fingertip amputation injury is apparently as simple as cleaning the wound and covering it with a simple dressing. If allowed to heal naturally, the fingertip restores its contour, fingerprint and sensation and undergoes a varying degree of lengthening. The success of this conservative treatment of fingertip amputation injuries has been documented in medical journals thousands of times.
{{
cite journal}}
: Unknown parameter |coauthors=
ignored (|author=
suggested) (
help)Given only a man's DNA and his son's, how would one determine which is the father and which the son? Thanks. Imagine Reason ( talk) 21:02, 2 May 2008 (UTC)
well how much does such a test cost??what is the typical duration???
As per the theory goes, greater the value of pKa of an acid, the weaker the acid is!But what about the comparison of Phenol and Ethanoic Acid? Both have a pKa value of 10 and 4.76 respectively. But Phenol is considered to be a stronger acid than Ethanoic acid, why so? As per the theory as 10 > 4.76, therefore STRENGTH OF ETHANOIC ACID > PHENOL??? kindly explain! —Preceding unsigned comment added by 123.252.231.92 ( talk) 21:05, 2 May 2008 (UTC)
My mobile phone frequently claims to have no signal, but if I attempt to make a call, it will go to four (out of five) signal-strength bars in the space of a second. Why does my phone do this and could I miss calls? ---- Seans Potato Business 22:35, 2 May 2008 (UTC)
"Additionally, many transposons contain promoters which drive transcription of their own transposase. These promoters can cause aberrant expression of linked genes, causing disease or mutant phenotypes." - by "linked genes" do they mean genes in close proximity or genes that are "physically linked" with no intervening stop codon? ---- Seans Potato Business 23:01, 2 May 2008 (UTC)
All food labels show serving size and the number of grams of each ingredient from a standard list. Where is a list of recommended amounts of these ingredients based on a person's age, weight, etc.? Also, where can I find lists of ingredients for foods that do not have labels? --Schaum 23:11, 2 May 2008 (UTC)
Science desk | ||
---|---|---|
< May 1 | << Apr | May | Jun >> | May 3 > |
Welcome to the Wikipedia Science Reference Desk Archives |
---|
The page you are currently viewing is an archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
Hello. If hydrogen bonds with a halogen, then is the compound ionic or covalent? For example, should I call it hydrogen fluoride (ionic conjugation) or hydrogen monofluoride (covalent conjugation), hydrogen chloride or hydrogen monochloride, hydrogen bromide or hydrogen monobromide, hydrogen iodide or hydrogen mon(o)iodide? (Astatine is the least reactive halogen but may react with hydrogen.) If hydrogen bonds with an alkali metal, then the compound is ionic. Right? Thanks in advance. -- Mayfare ( talk) 00:57, 2 May 2008 (UTC)
Can some one please tell me the price of nitrogen per specific measerment? i need the info for a school prodject. hear is an example: Nitrogen cost 12 dollars per gram........... —Preceding unsigned comment added by 76.14.124.175 ( talk) 02:47, 2 May 2008 (UTC)
Call your local "Welding supply" company and ask them; they can probably proide the price for both compressed gaseous nitrogen and liquid nitrogen. But I've heard that in bulk quantities, the price of LN2 is "about the same as beer".
Atlant ( talk) 17:35, 2 May 2008 (UTC)
Why does milk remove ink stains? —Preceding unsigned comment added by 222.153.234.166 ( talk) 07:26, 2 May 2008 (UTC)
Could someone please explain if these are separate concepts, or if not, which are synonyms. Could they all be put on the same page or do they each merit one? 71.236.23.111 ( talk) 08:10, 2 May 2008 (UTC)Lisa4edit
No, those terms are not synonyms, but obviously closely related. The term 'Biome' refers generally the largest unit including all the biotic community of an area. Hence basically it deals with the structural part of the living world, integrated by the fuctions of ecosystem. In contrarcy, the Ecosystem is system that integrates both the structural and functional aspects of the living world of a particular area. You can recognise the difference, if I say a Biome is well maintained standing Car either without fuel or driver. until the car starts rolling no work is done and we are unsure of the systems efficiency or even viability. As the fuel starts burning and the car moves it promotes some work and becomes a system. Henceforth, the biome become an ecosystem. There may be several smaller ecosystems in Biome itself. for example, in a Tropical Forest biome a few pond ecosystem, grassland ecosystem and forest ecosystem may be integrated. Next If I assume you are refering an 'Ecotope' as 'Biotope', then I can say an ecotope can be regarded as any piece of particular ecosystem, like a peice of garssland or a single wetlands etc. It is in fact a portion of a large biome, which have basically similar kinds of living environment. The margins of two adjacent ecotope, i.e. the transitional area of ecotopes is known as 'ecotone'. You should not confuse these three atall and they all have their own entities, so as the terms.
For further details on the issue, you may refer the book 'Fundamentals of Ecology' by O.P.Odum. - Dr.Rajarshi, India
A few questions about blood.
1) I'm looking for statistics/comparisions on how well blood acts as a conductor of electrcity. I looked at the blood article, and it mentions it contains electrloytes, but I'm looking for more information.
2) Building on the above question-could a person, drenched from top to bottom in blood, use this as a Faraday Cage? What I mean-He gives himself what would be a lethal electtric shock, but the blood acts as a Faraday Cage, leaving the person unharmed, but making it look as though he recieved the full shock.
I understand these are quite bizarre questions, but it is for this exact reason that I need help with them.
Thanks very much in advance. Cuban Cigar ( talk) 13:47, 2 May 2008 (UTC)
See this 1950 article (.pdf) for discussion of the conductivity of blood. - Nunh-huh 03:56, 3 May 2008 (UTC)
I have two questions about it. First, what makes activaed carbon "activated"? After reading the wiki article on it I'm a little confused as to how physical or chemical changes make carbon activated. Secondly, when it states that a gram of activaed carbon can have a surface area of 500 square meters, does that mean that if i streched out that piece of carbon it would cover an area that big? Thanks Deltacom1515 ( talk) 13:52, 2 May 2008 (UTC)
Ok, thanks. One down, one to go. Deltacom1515 ( talk) 15:26, 2 May 2008 (UTC)
Let clear the concept more lucidely. You can think of a honeycomb, when you have a piece of activated carbon (non-powdered form). As in honeycomb the wax are sread over the walls of wholes or cavities, the surface of which can not be spread out to assess the area, in case of activated carbons huge numbers of microspores are available, which can not be measured as spread sheet. The surface is known as BET surface, and is available for adsorption of gas molecules. In response to the other question, the activation perhaps refer to enhaced capacity of the carbon as a adsorbent material, due to enhancement in the effective surface area. But, there may be some further explanation beyond this. - Dr.Rajarshi
Another question in a similar vein to the previous one.
For How long can a person's heart completley stop before a person before it is irrecovably damaged to the extent that death is inevitable? I know it is in seconds-but how many? And what factors can change this? The heart article gives 2 seconds-but this makes me think of numerous cases who have been "clinically dead" for days, before magically reviving. So-for how long can a person stop their heart without dying? (Like to point I don't plan to do any of these things-I'm just really curious).
Thanks in advance. Cuban Cigar ( talk) 15:16, 2 May 2008 (UTC)
hello plese tell me about what are the various part of a robort machine and how i assemble it??// plese tell me the correct answer.. i am waiting for this.. —Preceding unsigned comment added by 59.98.104.100 ( talk) 17:11, 2 May 2008 (UTC)
I've always wondered why reporters (and even fire fighters) often say that, when they're fighting a wildfire, that if temperatures drop, it helps to fight the fire. How do cooler temperatures help in fighting wildfires? Corvus cornix talk 17:56, 2 May 2008 (UTC)
The extracellular matrix was said to be extracted from pig bladders.
Now, if this story were true, what would happen to his finger print? What are the chances that the regained tissues run amok and cause cancer? -- Toytoy ( talk) 20:29, 2 May 2008 (UTC)
One of the most encouraging signs that human limb regeneration is a feasible goal is the fact that our fingertips already have an intrinsic ability to regenerate. This observation was made first in young children more than 30 years ago, but since then similar findings have been reported in teenagers and even adults. Fostering regeneration in a fingertip amputation injury is apparently as simple as cleaning the wound and covering it with a simple dressing. If allowed to heal naturally, the fingertip restores its contour, fingerprint and sensation and undergoes a varying degree of lengthening. The success of this conservative treatment of fingertip amputation injuries has been documented in medical journals thousands of times.
{{
cite journal}}
: Unknown parameter |coauthors=
ignored (|author=
suggested) (
help)Given only a man's DNA and his son's, how would one determine which is the father and which the son? Thanks. Imagine Reason ( talk) 21:02, 2 May 2008 (UTC)
well how much does such a test cost??what is the typical duration???
As per the theory goes, greater the value of pKa of an acid, the weaker the acid is!But what about the comparison of Phenol and Ethanoic Acid? Both have a pKa value of 10 and 4.76 respectively. But Phenol is considered to be a stronger acid than Ethanoic acid, why so? As per the theory as 10 > 4.76, therefore STRENGTH OF ETHANOIC ACID > PHENOL??? kindly explain! —Preceding unsigned comment added by 123.252.231.92 ( talk) 21:05, 2 May 2008 (UTC)
My mobile phone frequently claims to have no signal, but if I attempt to make a call, it will go to four (out of five) signal-strength bars in the space of a second. Why does my phone do this and could I miss calls? ---- Seans Potato Business 22:35, 2 May 2008 (UTC)
"Additionally, many transposons contain promoters which drive transcription of their own transposase. These promoters can cause aberrant expression of linked genes, causing disease or mutant phenotypes." - by "linked genes" do they mean genes in close proximity or genes that are "physically linked" with no intervening stop codon? ---- Seans Potato Business 23:01, 2 May 2008 (UTC)
All food labels show serving size and the number of grams of each ingredient from a standard list. Where is a list of recommended amounts of these ingredients based on a person's age, weight, etc.? Also, where can I find lists of ingredients for foods that do not have labels? --Schaum 23:11, 2 May 2008 (UTC)