Wednesday
May 22, 2013

Posts by GK

Total # Posts: 639

chemistry
Yes, if the the molecule is symmetrical enough for the bond dipoles to cancel out. Example: O=C=O has polar bonds but their dipoles cancel out because of molecular symmetry.

organic chemistry
The ideal solvent for recrystallization is one in which the solute has high solubility at high temperature and low solubility at low temperature. You could try to look up solubilities in chemistry handbooks or experiment with different solvents. If you have to do that you migh...

Chemistry 130
pH = -log[H+] The above relationship can also be expressed as: [H+] = 10^(-pH) or [H+] = 1 / 10^(pH) That shows the hydrogen ion concentration is inversely proportional to the pH.

Chemistry
The correct answer is (a) based on the first chemical equation below. The mole ratio of NaOH to H3PO4 determines which salt is produced. Only the first one produces Na3PO4: H3PO4 + 3NaOH ---> Na3PO4 + 3H2O H3PO4 + 2NaOH ---> Na2HPO4 + 2H2O H3PO4 + NaOH ---> NaH2PO4 + ...

CHEMISTRY
It could be an alkene as DrBob indicated or an ether depending on experimental conditions such as temperature.

Chemistry
ΔE = q - w ΔE is the change in internal energy of a system q is the heat flowing into the system w is the work being done by the system The 2424 J is released to the surroundings. It should be assigned a negative sign. The 6 KJ is work done against the surroundings. ...

Chemistry
According to the Work-Energy Theorem, Work = Ek(final) - Ek(initilal) Ek(initilal) = (1/2)mv^2 = (1/2)(0.17kg)(4.5 m/s)^2 Ek(final) = (1/2)mv^2 = (1/2)(0.17kg)(4.0 m/s)^2 Work = ?__________ NOTE: This looks like a Physics question.

Chemistry
This looks like diatomic species (molecules or ions) of third row elements with 14 electrons. It may be Cl2, SCl-, etc. You should be able to come up with a couple more.

chemistry
Distinguish experimentally? 1-octene would discolor a solution of Br2. 1-octanol and toluene would not react with Br2 easily. 1-octanol could be oxidized easily by a chromic acid solution or other strong oxidizer. One of the reaction products would be Cr^+3 ions. 1-octene and ...

Chemistry
Not arguing with DrBob. Just presenting another way of looking at it using change in oxidation numbers as the yardstick for electrons transfer. The balanced reaction is: 2C3H7OH + 9O2 --> 6CO2 + 8H2O Each of the 18 oxygen atoms in O2 changes from an oxidation state of 0 to ...

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