Number of results: 130,575
I have two Chemistry related questions that were in my AP Chem summer packet. The first has to do with Stoichiometry. It says, "Calculate the number of moles, molecules, and atoms in 60.0 g of boron triflouride. I calculated that there are .885 moles, and 5.33 x 10^23 ...
Monday, August 28, 2006 at 6:50pm by kelly
Criticize the following statements. 1. In an ionic compound, the number of cations is always equal to the number of anions. [Is it ok to say 'not always'?] 2. The molecular formula for strontium bromide is SrBr(sub 2) [what's wrong wih this?] 3. The mass number is always equal...
Monday, September 25, 2006 at 7:26pm by Chris
Posted by Kim on Tuesday, October 31, 2006 at 8:11pm. I am COMPLETELY LOST for this one...dnt even know where to start MOLES 1) Lithium Hydroxide reacts with Carbon Dioxide to form solid Lithium Carbonate and Water. How many grams of carbon dioxide can be absorbed by each 1 ...
Wednesday, November 1, 2006 at 5:48pm by kim
write the equation for copper(II) sulfate pentahydrate and ammonium sulfate forming: Cu(NH4)2(SO4)2*6H2O not sure how to balance it Check your question very carefully. Is this a question given to you by a teacher? yeah it is in a lab CuSO4.5H2O + (NH4)2SO4 >>Cu(NH4)2(SO4...
Monday, November 6, 2006 at 8:59pm by harry
Can Someone describe the structure of ionic compounds for me please.. Ionic compounds consist of a three dimensional array network of + and - ions. I expect you already know that. As to structure, here is a web site that may help. Repost if you have additional questions but ...
Wednesday, November 15, 2006 at 5:01pm by bryan
What is the charatteristic of covalent bonding meaining what happens and then what is the result from what happened (like does it form a molecule, compund, etc. . . Same thing for ionic bodnging The ionic part is discussed below. Look for a chemistry post by smooches. Here is ...
Thursday, November 30, 2006 at 8:41pm by direct in Effect
I was sick for 2 days, and that's really not good in any chemistry class, let alone mine, which is an advanced one. I don't know what I was thinking when I tried to be smart, but I really need help. It's pretty basic, I think, so anyone..? Also, I really have tried these......
Wednesday, December 13, 2006 at 9:44pm by Trish
Here is a reaction: 2Al+3H2SO4--->Al2(SO4)+3H2 determine the oxidation numbers of each element in both the rectants and the products of this oxidation reduction reaction of aluminum and sulfuric acid? Which element is oxidized in this reaction? Which element is rduced in ...
Tuesday, January 9, 2007 at 4:15pm by chrissy
Where can i find the quanity measured by each of of the seven SI base units and the SI symbol of the unit. Here: http://www.chemie.fu-berlin.de/chemistry/general/si_en.html thanks
Sunday, January 21, 2007 at 11:35am by Bryan
what is the atomic number of ununhexium and the full symbol is this a transitional element that is a metal and what is its highest hydride and highest fluoride of ununhexium thanks What is known about Uuh can be found here. Look for element number 116. Go to www.webelelements....
Tuesday, January 30, 2007 at 4:35pm by mickey
You do it by finding Uuh in the periodic table and knowing that it will have chemical properties that are similar to those in the group with it. Here is a periodic table on the web. Find element #116 and observe the other elements in the same group (O, S, Se, Te, Po). We know ...
Monday, February 5, 2007 at 9:39am by DrBob222
If a chemistry student collected 825 mL of gas at 25 degrees C and 7.90*10^2torr, how many moles did she collect? PV=nRT Put P in atmospheres. torr/760 = atm. V is volume (in LITERS.) solve for n, the number of mols. R is a constant of 0.08206 L*atm/mol*K T is temperature in ...
Monday, February 5, 2007 at 1:14pm by Chrissy
Dr bob, Thanks, i understand that, at last! But wot if im asked to calculate when it is given as words? would it still be the same? Ie. instead of Al2O3, im giving it in words ie aliminium oxide. Basically im asked to calculate the mass of oxygen and the mass of aliminium in ...
Monday, February 5, 2007 at 1:53pm by bertie
GIVE THE EMPIRICAL FORMULAE OF THE HIGHEST HYDRIDE AND HIGHEST FLUORIDE OF UNUNHEXIUM, EXPLAINING HOW YOU ARRIVED AT YOUR CONCLUSIONS Here is the web site for a very good periodic table. Look for element #116, Uuh. Elements in the periodic table have similar chemical ...
Tuesday, February 6, 2007 at 3:37pm by Gemma
Does anybody know of a website that explains organic nomenclature ? ...something along the lines "organic nomencluture for Dummies" would be great :-) I'm stuggling to underatand "Z-3-Bromo-6-methyloct-3-ene" let alone draw it ! Here is a site that might just be what you are ...
Monday, March 12, 2007 at 2:22pm by WeatherGirl
ho do you calculate final temperature? anyone please help thanks that's a little vague. Are you dealing with ideal gases? If so you would use the formula PV=nRT P = pressure V = volume of container n = moles (grams/molar mass) R = gas constant (0.0821) T = temperature sorry ...
Thursday, March 15, 2007 at 6:28pm by shannon
? about this website
I have another question about this website. Are you guys all teachers and perfessors.? Thank you all for helping with my home work when ever I needed it. Many of us are teachers/professors. Always happy to be of help. retired mathteacher here retired chemistry prof here. ...
Monday, April 2, 2007 at 2:58pm by Amy
Is anyone here a chemistry genuis?
The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many metal ions. Assume that 9.7416 g of M(CHO2)2 (where M represents the atomic symbol for a particular metal) are dissolved in water. When a solution of 0.200 M sodium sulfate is added, a ...
Friday, April 9, 2010 at 12:49am by timmy
Is anyone here a chemistry genuis?
I haven't worked the problem; however, I have a few observations to make. Paragraph 1 is all you need to identify M; but, I question the numbers. The formate ion has an ionic mass of 45 and two of them makes 90. Thus the molar mass of M(CHO2)2 is M + 90. When M forms the ...
Friday, April 9, 2010 at 12:49am by DrBob222
Is ayone here a chemistry genuis?
I have the same problem and the mass is larger after the precipitate is filtered washed and dried. I have 9.9389 on my paper. I think the person who posted the question mistyped the number
Friday, April 9, 2010 at 12:49am by Nn