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Messages - cuso4
This question has been bothering me a while now, maybe Jay can put my mind at rest.
Copper (II) ions form the blue hexaaqua ion with water, [Cu(H2O)6]2+. On adding excess ammonia the blue colour changes into a beautiful deep purple as the tetraammine ion forms, [Cu(NH3)4(H2O)2]2+.
Ligand substitution occurs, but why are only 4 H2O ligands are replaced and not all six?
Both Cl- and O2- are anions, would they react together to form other compounds? Like ClO-?
Or would Cl2 and O2 produced react with the anode? For example in the electrolysis of Al2O3, the oxygen produced at anode react with the carbon electrode to form CO2.
The heat is produced from the chemical reaction in the body. Normally the body carries out thermal regulation to keep the body temperature at about 37 degrees C. In the case of an infection, the brain increases the set temperature in the body (say 39 degrees), so the body doesn't start cooling down until the internal temperature exceed 39 degrees. And yes this mechanism is body trying to fight the infection.
Chris, please correct me if I'm wrong.
Jay, are planning on doing a medical degree?
Here in the UK, there is a exam called BMAT (don't know what it stands for). Some universities ask prospective undergraduates to take this exam and may make offers depending on the result.
« on: 20/04/2004 11:39:34 »
Russia also have been using phage therapy for ages. If I was diagnosed a serious bacterial infection I would insist on using phage therapy instead of antibiotics treatment.
We've just been talking about MRSA and antibiotic resistance in my biology classes. My teacher said that bacterial infections are actually better treated with specific bacteriophages. And even if the bateria became immune due to mutation the phage will also change to keep up with the bateria. She also said that phage therapy actually have been used by the Russians for a long time! How come we don't have phage therapy here in the UK or in the US?
I found something on the Internet which might be what we're looking for.
Why are there 7 days in a week?
One month is roughly the time taken for the Moon to rotate the Earth once. One year is 365 days and divide this by 12, we get 30.416 days per month. One week is the time taken for the Moon the a quarter of the Earth. So divide 30.416 by 4, we get a value around 7.
I'm not sure anout the second question but I'll have a go.
Monday is named after the Moon and since ancient people use the movement of the Moon to measure time (Chinese Calender is based on this), Monday is set to be the first day of the week.
« on: 15/03/2004 08:29:36 »
Neil, the photos are great. Although I doubt some of the pictures (they are just opening their mouth but not actually yawning)
« on: 12/03/2004 19:32:24 »
Oh right....and thanks Jay for the explanation.
« on: 12/03/2004 12:33:17 »
The cells don't know which gene they will inherit. We cannot be certain which cell will have which gene, we only know the probability of a cell having a certain gene.
« on: 12/03/2004 12:22:49 »
I think people like to scratch the itchy areas because this action mix up the sensation impulses which the brain are receiving. When you scratch, the brain detects the feeling of scratch and forgot about the itch. This is a bit like rubbing your head after you accidentally bumped into a wall .