Number of results: 17,231
another chem question
Examine the following unbalanced chemical equation: CO(little2) + C --> CO Which of the following is the correctly balanced form of this equation? 2CO(little2) + C --> CO CO(little2) + C -->2CO CO(little2) + C(little2) --> CO CO(little2) + C -->C(little2)O ...
Friday, August 5, 2005 at 7:38pm by alf
can somebody answer my chem questions below plzz
I have posted some chem question below can somebody answer them plzzzzzz Multiple posts asking people to answer your questions will get you banned. Please be patient as someone will help you as soon as possible. If you were travling from Devner,Colardo to Bishmark, North ...
Friday, September 2, 2005 at 11:33am by Nisar
What is another name for cardamist? Please write the formula and a link to its structure. See http://antoine.frostburg.edu/chem/senese/101/consumer/faq/what-is-cardamist.shtml
Sunday, September 4, 2005 at 5:04pm by Nisar
Chem (solubility of MF2, check my work)
The Ksp of magnesium fluoride is 6.4E-9. Calculate the solubility (in grams per liter) of magnesium fluoride in water. MgF2 <---> Mg^2+(aq) + 2F^-(aq) [Mg^2+] = x & [2F^-] = 2x (x)(2x^2) = 6.4E-9 4x^3 = 6.4E-9 x^3 = 1.6E-9 x = 1.2E-3 [Mg^2+] 2x = [F^-] = 2.4E-3 ?g MgF2/L...
Monday, June 12, 2006 at 1:39pm by Kizner
I'm tyring to study for my chem exam and I cant figure out how to do this question: The solubility of MgCl2 is 54.25 g per 100ml of water at 25 degrees C. A student prepares a 2.50 mol/L solution of MgCl2 and states it is a saturated solution. Useing calculations determine if ...
Saturday, June 17, 2006 at 11:55am by Tracy
Chem Titration and pH
Calculate the pH at 0mL, 5mL,...40mL for a 10.0mL aliquote of 0.100M Na3AsO4 (weak base) titrated with 0.100M HCl pKa1 = 2.25 pKa2 = 6.77 pKa3 = 11.60 Thank you First you should write equations to know where we are in the titration. At the beginning, we have the hydrolysis of ...
Saturday, October 7, 2006 at 6:15pm by julie
The correction terms in the Van der Waals equation for a gas are designed to correct A. the pressure term (P +a/V2) for the attractive forces between particles. B. the volume term (V-b) for the finite volume of the particles. C. For the volume term (b) not the pressure term (a...
Wednesday, October 18, 2006 at 7:23pm by Mendi
Are: Ba(NO3)2, Ti)2, MgI2, and Ca(CH3COO)2 soluble or insoluble in H2O @ 25degrees C? Here is a site that lists the solubility rules. You should know this table; eventually you will want to know it so well that it is memorized. If you still have questions after viewing this ...
Friday, October 20, 2006 at 1:41pm by K
An experiment is preformed to determin the empirical formula of a copper iodide formed by direct combination of elements. A clean strip of copper metal is weighed accurately. Its is suspended in a test tube containing iodine vapor generated by heating solid iodine. A white ...
Sunday, October 22, 2006 at 1:38pm by ALie
Use the following data (in kJ/mol) to estimate the standard enthalpy of formation (in kJ/mol) for hypothetical compound CsF2 in the solid state. Lattice energy of CsF2 -2347 First ionization energy of Cs 375.7 Second ionization energy of Cs 2422 Electron affinity of F -328 ...
Wednesday, November 1, 2006 at 6:20pm by Rossina
How can I do this: 3KNO3(aq)+ Fe(SCN)3(aq) + NaOH(aq) <---> ? what do you have to do? write the products it makes. I don't know the products it makes. I have to figure out what adding all those produces. Im not sure its even possible? yes it is possible. first of all ...
Sunday, December 3, 2006 at 8:16pm by Nick
Posted by chrissy on Saturday, January 6, 2007 at 1:23pm. In a lab expirement you add copper(II)nitrate to pure zinc. Write a balanced equation for this expirement and predict if a reaction will occur. For Further Reading Chemistry Equation - DrBob222, Saturday, January 6, ...
Saturday, January 6, 2007 at 8:32pm by chrissy-needs Chem help ASAP
What causes dispersion forces? Disperson forces are caused by an unsymettrical distribution of charge in the molecule, causing a net electric force. http://www.chem.purdue.edu/gchelp/liquids/disperse.html
Tuesday, January 9, 2007 at 6:46am by Dennis
AP Chem - to Dr. Bob
I don't understand how to even start this problem: A mixture of H2(g), O2(g), and 2 mL of H2O is present in a 0.5 L rigid container at 25 degrees Celsius. The number of moles of H2 and the number of moles of O2 are equal. The total pressure is 1146 mmHg. Vapor pressure of ...
Tuesday, January 23, 2007 at 10:23pm by Belinda
Basically what color is yellow when they say "Yellow"? The titrations I have done are light yellow when approaching the end point but whatever color you see is what you get, I suppose. So titrate to a very light color. Would the extra 5ml of starch indicator have any effect on...
Wednesday, July 18, 2007 at 12:18am by DrBob222
How did you get 9.265 nm for absorbance? A nm is a unit of length, not absorbance? For the next part, A = k*c (I've omitted the cell length since that usually is a constant value). A = molar absorptivity x concn(in M) A = 3.85 x 10^5 x 2.50 x 10^-5 = ?? That is the absorbance ...
Monday, October 11, 2010 at 10:59pm by DrBob222
hi im doing a post lab sheet for chem class. and im having a little trouble. i have: temperature 12.6 C -> 285.6 K Time 816 sec but im supposed to find 1/T(K) it looks like my classmate did this: 12.6 x 285.6 = 3598.56 however they gave me the response to group 2 also: and ...
Saturday, October 16, 2010 at 9:08am by chem
A. What is the frequency of a photon with a wavelength of 8.35 multiplied by 10-5 m? (The speed of light in a vacuum is 2.998 multiplied by 108 m/s. Planck's constant is 6.626 multiplied by 10-34 J·s.) B. What is the wavelength of a photon with a frequency of 6.00 multiplied ...
Wednesday, December 1, 2010 at 8:20pm by NeedHelp!
A. What is the frequency of a photon with a wavelength of 8.35 multiplied by 10^-5 m? (The speed of light in a vacuum is 2.998 multiplied by 108 m/s. Planck's constant is 6.626 multiplied by 10^-34 J·s.) B. What is the wavelength of a photon with a frequency of 6.00 multiplied...
Wednesday, December 1, 2010 at 8:20pm by NeedHelp!
c = frequency*wavelength works both of them.
Wednesday, December 1, 2010 at 8:20pm by DrBob222