Thursday

October 8, 2015
Total # Posts: 813

**CHEM**

What is the exact method/formula used to calculate oxidation state #'s? & how does one know when to use the correct oxidation state #? For example: Carbon carries 4,2,-4; Cl= 1,5,7,-1; and, Mn=2,3,4,7. Thanx. You use the seven rules in your text. Assigning of the oxidation...
*December 14, 2006*

**CHEM**

A gaseous hydrocarbon (an organic compound consisting of C & H) weighing 0.232g occupies a volume of 102mL at 23 degrees Celcius and 749mmHg. Calculate the molar mass and identify the compound. The compound is: a)C2H4 b)C3H6 c)C4H8 d)C5H10 e)C6H12 How is this problem worked ...
*December 13, 2006*

**CHEM**

thank you VERY much for your replies, DrBob. Another question, however: How many moles of ions -both cations and anions- are present in solution when 0.75 mol of potassium chloride is dissolved in 0.25L of distilled water? How do I work this answer to be: 1.5mol? KCl(s) + H2O...
*December 12, 2006*

**CHEM**

how do I work this question out?: 50.00g of NaCl are dissolved in water to give a solution that contains 2.500% NaCl by mass. The density of the solution is 1.030g/mL. The volume of the solution is: a)941.8mL; b)1.942L; c)2.500L; and, d)50.0mL. I know the answer is "b&...
*December 11, 2006*

**Math**

Find X 27^4x-2=243^3x=6 Please Explain Thanks Is this a repeat of the problem you posted earlier? If so, it should be 274x-2 = 2433x+6 You might try it the hard way. (4x-2)*log 27 = (3x+6)*log (243) Solve for x. I get -12. Post your work if you get stuck. You have too many = ...
*November 28, 2006*

**Math**

Find X 27^4x-2=243^3x+6 Please explain how to do it. Thanks 27^(4x-2)=243^(3x+6) Notice that 27 and 243 are both multiples of 3 Changing them.. (3^4)^(4x-2)=(3^6)^(3x+6) 3^4(4x-2)= 3^6(3x+6) taking the log base 3 of each side. (4x-2)= (3x+6) and solve for x. That doesn't ...
*November 28, 2006*

**Chem**

what is NH3 in written form? ammonia As a note, it is becoming more and more common to see ammonia written in IUPAC form, H3N, and the ammonium Ion written as H4N+
*November 17, 2006*

**acids and alkalis**

hello
*November 4, 2006*

**presentations**

Imagine you have a meeting with the CEO and other high ranking officers of a company that invests in distance learning start-ups. Your objective is to obtain a loan for a distance learning company that you would like to start. Fortunately, you have a mentor to whom you can ...
*October 21, 2006*

**Business Management**

As your first job as the new manager at the outdated, adversarial company, write a plan for changing its organizational structure, incorporating the following elements: Your vision of the new organizational structure for your division including how you would realign ...
*October 20, 2006*

**science**

chemical changes: hydrogen + oxygen = water or H20 and carbon+ oxygen = carbon dioxide or C02. Equation for the above are: Hydrocarbon + oxygen = carbon dioxide + water + energy. CH4+202 = C02+2H20 Physical changes are: wax (solid) melts into liquid. some of the waxy liquid ...
*October 20, 2006*

**Chem**

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 ...
*October 20, 2006*

**CJ -- proofread please**

The federal criminal pretrial process begins with the first appearance. This appearance is held before a magistrate during which the legality of the defendant’s arrest is initially assessed and the defendant is informed of the charges on which he or she is being held (...
*September 21, 2006*