Wednesday
December 11, 2013

# Posts by GK

Total # Posts: 644

Chemistry
Zinc is higher on the Metal Activity Series than iron. That means zinc metal oxidizes more easily than iron. The metal that oxidizes more easily can protect another metal that oxidizes less easily but not the other way around.

chemistry
The reaction is: 3Ca(NO3)2 + 2Na3PO4 --> Ca3(PO4)2 + 6NaNO3 moles of Ca(NO3)2 = (0.025L)(1.0mol/L) = 0.0250 mol moles of Na3PO4 = (0.0150L)(1.5 mol/L) = 0.0225 mol The mole ratio of Na3PO4/Ca(NO3)2 is 2/3 BUT we are mixing the two reagents at the ratio of 0.0225 / 0.0250 = ...

chemistry
1. Divide 50.0g of Si by the atomic mass of Si. That will give you the moles of silicon. 2. Equal moles of any two elements contain equal numbers of atoms. Based on that, multiply the previous answer by the atomic mass of copper to get the number of grams of copper with the sa...

general chemistry
Let the initial and final concentrations be Co and Ct. To find k: ln(Ct/Co)=-kt ln(0.5) = -k(410s) k = ____? To find the concentration at (4)(410s), use the same equation: ln(Ct/Co)=-kt Use the value of k from the first part, and t = 4x410=1640s, then solve for for Ct.

chemistry
5% means 5.00g acetic acid in 100 mls of solution. That is equivalent to 50.0 g acid/L. The molar mass of acetic acid is about 60.05g/mole (50.0 g acid/L.)(1 mol / 60.05g) = 0.8326 mol/L The reaction is: HC2H3O2 + NaOH --> NaC2H3O2 + H2O based on the reaction, moles of HC2H...

chemistry
These two solutions do not react but you can write a chemical equation anyway: 2KCl+ CuSO4 --> K2SO4 + CuCl2 If you include complex ion formation, what happens depends on the concentrations of the ions formed in solution.

chemistry
Do you mean higher ionization energy? Phosphorus has a higher first ionization energy. Its 2p subshell is half-filled with one eletron in each orbital. The three electrons have identical (parallel) spins. A sulfur atom has one more electron than phosphorus in the 2p subshell. ...

chemistry
The molar mass of KHC8H4O4 is 204.22g Use the above value to convert 0.3589g of "KHP" to moles. The mole ratio of NaOH to KHP is 1/1 (same number of moles). Molarity = moles / 0.01496 L = __________M

Chemistry
CuSO4.5H2O ---> CuSO4+5H2O is correct if the heating is somewhat gentle. The solid product, anhydrous CuSO4 is white. If you heat the hydrate too strongly, you will end up with black CuO.

chemistry
The DeBroglie wavelength of a moving body is given by: wavelength = h / mv h = 6.63x10^-34 Js m = 0.0459 kg v = 80.0 m/s Substitute the above values into the formula to find the wavelength.

Pages: <<Prev | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>

Search
Members