Number of results: 235
Would Flame test be useful for detecting metal ions present in a mixture of metal ions?? It is not a reliable method. Atomic spectroscopy would be much more accurate and sensitive than the human eye. To add to the information provided by Bob Pursely, which of course is correct...
Monday, October 23, 2006 at 3:27pm by Bryan
Why does ionization energy tend to increase as you move across a period? As you move across a period, you add a proton in the nucleus and an electron in the outer shell. Ther greater number of protons causes a stronger pull on the electrons. The electrons are held tighter, ...
Tuesday, October 31, 2006 at 9:40pm by Bryan
Where can i find drawing of electron dot stuctures for compounds like BR2 and HCN HCN is at the link below. http://dl.clackamas.edu/ch106-01/formulas.htm I couldn't find one for Br2 on line but here is how it will look.   .. .. :Br:Br:   .. .. That is ...
Wednesday, November 29, 2006 at 9:26pm by Lance
i dont get how to do molar conversions? I hope this helps. 1.) Go to google. 2.) Type in molar conversions 3.) Click on the first link. This link has examples and the answers to the practice problems. To get better at these. Remember to keep practicing. If you can be more ...
Thursday, January 4, 2007 at 8:59pm by gabby
have been asked to write how i got this equation but i cant put it in words can you help me Al2 Se3 +6 H2O ==> 2Al (OH)3 +3H2Se i can do this but like i said putting it into words i just cannot make it coherant The answer you should give is you found it on the internet. The...
Wednesday, January 31, 2007 at 8:29am by donald
what is the balanced equation for thereaction of aluminum selenide with water including the physical states reactants and products im given hydrogen selenide prepared by reacting aluminum selenide with water other product solid aluminum hydroxide please can you help minnie: ...
Thursday, February 1, 2007 at 5:33am by donald
Using information from the periodic table, how can you find out which chemical element another (Uuh) resembles? It resembles those elements in the same group. So Uuh should have similar chemical properties to Se, Te, Po,etc
Thursday, February 1, 2007 at 3:09pm by L0bster_quadrille
can anybody give me the density of arsenic oxide at STP is this the correct formula volume = mass/ density thanks Yes, but if you want the density, it is density = mass/volume. The number I have seen floating around on this board is 17.8 g/L but the density of a gas and the ...
Sunday, February 4, 2007 at 2:34pm by bex
which element results if 2 protons and 2 neutrons are ejected from a radium nucleus with atomic num 88 and mass num 226 how do i go about this please can you help If you can add you can do these. 88Ra226 ==>2X4 + zzYww. Now make the numbers add. Protons must be conserved. ...
Saturday, February 17, 2007 at 11:23am by bex
if i am trying to find the diameter of an oil molecule and express my answer in scientific notation. the info is drop of oil 0.05 cm3 from a dropper spreads out to 40 cm2 is it vol = l x w x h 0.05cm3 = 20 x 20 xh 0.05 cm3 = 40cm2 after this im stuck as i dont know what the ...
Saturday, February 17, 2007 at 11:48am by bex
please could you tell me how i would draw an hydrogen atom which has only one electron and describe why it has so many spectral lines, I have studied my text books but cant seem to figure it out, many thanks in advance http://images.google.com/images?&hl=en&num=10&btnG=Google+...
Friday, March 2, 2007 at 1:18pm by bex
I have seen on the chemistry answers that a symbol is used please can you tell me what it means they are the upside v eg Na^ and CN^ It means that the number or symbol that follows is placed in the top corner of Symbol before it E.g cm^3 or CN^- you just cant write them on ...
Monday, March 12, 2007 at 3:34pm by bex
Could anybody help me with this question "In practice the methanol production process is operated at temperatures of 250 to 300 degrees and at a pressure of 50 to 100 atmosphere (50 to 100 times normal atmospheric pressure) in the presence of a copper based catalyst comment on...
Monday, March 12, 2007 at 4:11pm by bex
can anybody explain why and how a copper based catalyst helps in methonal production and the impact it would have on mass production many thanks A catalyst lowers the activitation energy needed for a reaction and allows reactants to produce more products at a lower temperature...
Wednesday, March 14, 2007 at 1:45pm by bex
hello how would i draw a monomer CH2-CHCH=CH2 I have to draw three monomer units can anyone help
Thursday, March 15, 2007 at 3:04pm by bex
how would i draw a structual formula of the products of the complete hyrolosis of tocainide O CH3-N-C-CH-NH2 CH3 H CH IM told this is tocainide please can anybody help a distressed student the O should be over the C atom
Thursday, March 15, 2007 at 3:12pm by bex
Is this the stuctual formula for hydolosis of tocainide CH3 NHCOCH^2N(C^2H^3)^2 CH3 WITH THE HEXAGON LINKING THE 2 X CH3
Thursday, March 15, 2007 at 4:08pm by bex
if the total pressure of a container filled with oxygen gas, nitrogen gas and water vapor is equal to the pressure of what ? A.oxygen only B. oxygen and nitrogen only C. water vapor only D. All 3 gasses added together Dalton's Law of Partial Pressures: The sum of the partial ...
Monday, April 2, 2007 at 6:02pm by Kristi
what is the strongest acid here? H2SO3 H2SO4 H2SeO3 H2SeO4 For oxyacids, the acidity increases with increasing number of oxygen atoms; therefore, H2SO3 and H2SeO3 will be weaker than either H2SO4 or H2SeO4. We have a problem determining which is the stronger of H2SO4 or H2SeO4...
Monday, April 30, 2007 at 2:59pm by luis
dimensions of a concrete pile are 14 inchesx14 inches x 15 feet. (1 meter=3.28 feet) the pile has 4 faces and 2 ends. 1>what is the surface area in square feet, of a single pile? exclude the ends of the pile. 2>What is the total surface area in square meters including ...
Tuesday, September 11, 2007 at 10:30pm by NIcole