Recent Homework Questions About Chemistry
The Young's modulus for a material is 15.0 x 1010 N/m2. The material is stretched to a strain of 6.0 x 10-3. How much elastic energy will be expended? (Express your answer in J/m3)
Sunday, November 17, 2013 at 3:25am
Knowing that the energy associated with the formation of 1 mole of vacancies in copper (Cu) is 104 kJ, determine the vacancy density (nv/cm3) in Cu at 1284 K. Assume the pre-exponential factor is one. unanswered
Sunday, November 17, 2013 at 3:24am
Chemistry Hey guys, i have a question about how to figure out how much mass of a compound i need to find 130ppm here is the question. What mass of Fe(NH4)2(SO4)2*6H2O is required to prepare 2.25 L of a 130 ppm iron solution? Now i know that ppm is (mg of desired compound)/(kg ...
Saturday, November 16, 2013 at 8:51pm
Oh okay, I understand. Wow thanks alot.
Saturday, November 16, 2013 at 8:48pm
A is not a heptane?
Saturday, November 16, 2013 at 8:27pm
The Young's modulus for a material is 8.0 x 1010 N/m2. The material is stretched to a strain of 2.0 x 10-3. How much elastic energy will be expended? (Express your answer in J/m3) pleasee answer it....
Saturday, November 16, 2013 at 8:08pm
This is tough without a diagram but I assume X and Y are just that; i.e., beginning and end. Ignoring signs, I believe delta E = 300-160 = ? and it's an endothermic reaction. Then Ea reverse = 300-160 = ? Ea is the sum of Ea reverse and delta E, again ignoring signs.
Saturday, November 16, 2013 at 7:19pm
Two new metallic elements have been discovered, Cimium (Ci) and Sadowium (Sd). Both the pure elements and their solutions form simple cubic lattices. The bond strengths of the Ci-Ci and Sd-Sd bonds are known, but not the Ci-Sd bond. Bond Bond Energy (kJ/mole) Ci-Ci -245 Sd-Sd...
Saturday, November 16, 2013 at 7:06pm
I would like to read the question.
Saturday, November 16, 2013 at 5:42pm
Actually I solved it - and just to clarify what Dr. bob was doing: dHrxn = (n*dH SO3) - (n*dH SO2) where n is equal to 2 based on the stoichiometric equation 2SO2 + O2 ==> 2SO3 Indeed, Find dHf SO3 and dHf SO2 in tables in your text or notes. Then, the number of moles of ...
Tuesday, October 15, 2013 at 4:25am
the species most easily reduced have large positive voltage potentials and the species most easily oxidized have large negative potentials.
Thursday, May 19, 2011 at 2:59pm