Chemistry
chart h2so4 density and purity
Submitted by Anonymous on 14 December 2006 - 2:24pm.i wanna know about the relation between density and percentage of sulfuric acid - water. can anyone please to share the url, or to share the chart? i really need it. thanks before
organic chemistry please help me
Submitted by Anonymous on 5 October 2006 - 7:34pm.how is B-carotene used in humans?
Can anyone help me?
Submitted by Anonymous on 25 August 2006 - 1:02pm.Why when breaking in a car a normal balloon will travel forwards but helium balloon will travel backwards?
BANANA LEAF EXTRACT AS A GLASS CLEANER?
Submitted by Anonymous on 16 August 2006 - 10:31am.IS THAT POSSIBLE? CAUSE THATS OUR RESEARCH TITLE
AND CAN YOU GIVE ME A COMPOSITION OF A BANANA LEAF EXTRACT
CHEMICAL BREAKDOWN
Submitted by Anonymous on 5 August 2006 - 5:30pm.HI IF THERE ARE ANYONE WHO KNOWS A CHEMICAL SOLUTION TO BREAKDOWN OR CLEAN VASELINE OR FATS CAN YOU PLEASE EMAIL ME ON reddpmax69@yahoo.co.uk THANX
A question about the electrolysis of water
Submitted by cytsunny on 20 July 2006 - 7:50am.As the topic, when we want to do electrolysis on water, we must add something into the water to increase the electricity conductivity of the water, so as to increase the rate of reaction.
Sometimes, we will add acid into the water. This is easy to understand. There is more H+ ions and the concentration is higher.
However, when we get NaCl into the water to make the water into dilute NaCl solution, the situation is totally different. There is Na+ and Cl- ions added into the water only, where both of them will not take part in the reaction. Then, why the electircity conductivity of the water will be increase? Why the rate of the reaction will be increase?
Hydrogen Fluoride and Water
Submitted by Anonymous on 17 July 2006 - 7:26am.It is said that Hydrogen bonding effects are especially pronounced in water because water has two hydrogen atoms and two unshared electron pairs ,giving each molecule the oppertunity to participate in four hydrogen bonds.But HF also has oppertunity to participate in four hydrogen bonds but even then it has much lower boiling point than water. HF also has lower melting point than water. Can you explain why? I'm first year college student. Thank you
Sincerely,
Vijay
Magnetic Moments?
Submitted by Anonymous on 27 June 2006 - 4:46pm.Can someone please tell me what a magnetic moment is?
Substances where the solid is less dense than the liquid?
Submitted by Anonymous on 23 June 2006 - 9:08am.Someone asked me a straightforward question today -
are there any other substances besides water where the solid is less dense than the liquid?
I realised I couldn't think of any -
anyone know any examples?
I'm guessing something else that has loads of hydrogen bonding...
About the defination of metal.
Submitted by cytsunny on 13 June 2006 - 2:16am.Metal is something that have high electricity conductivity, heat conductivity, ductile, and so on. I know this. However, if there is a clear defination that WHAT is metal? Elements that can form metalic structure?
If there is no clear defination, then how did the scientists divide the periodic table into metal, semi-metal and non metal if thre is no a clear defination?
