Saturday
December 7, 2013

# Posts by GK

Total # Posts: 644

Chemistry
NO2, the compound is nitrogen dioxide. NO2^-, is the nitrite ion.

Chemistry - pH
a) 0.35M HCl (monoprotic strong acid) produces a 0.35M [H+] solution. pH = -log(0.35) c) 0.35M NaOH (strong base) acid produces a 0.35M [OH-] solution. pOH = -log(0.35) pH = 14-pOH b) 0.35M HC2H3O2 (WEAK ACID) does not dissociate completely. Its Ka = 1.8x10^-5 [H+] = sqrt[(Ka)...

chemistry
"Metal" generally refers to a metallic element such as iron, copper, silver, etc. An "alloy" is a homogeneous mixture of two or more metallic elements. Examples, Brass (copper+zinc), stainless steel (iron+nickel+chromium), 14K gold (gold+copper), etc.

chemistry
You should know or look up: 1 nm = 1x10^-9 m 1 cm = 1x10^-2 m Using the above: (294nm)(1x10^-9 m/nm) = ?___m (?---m)(1 cm/1x10^-2m)

Chemistry
Look up the atomic masses of Pb, P, and O Multiply the atomic mass of Pb by 3. Multiply the atomic mass of P by 2. Multiply the atomic mass of O by 8. Add the three values you got. That is the formula mass which you label "grams/mole".

Chemistry
1 mole = 6.02x10^23 A bromine molecule has the formula Br2. Multiply the number of Br2 molecules by 2 to get the number of atoms of bromine. Divide the number of atoms by 6.02x10^23 atoms/mole to get moles of Br atoms

chemistry
A sodium carbonate, Na2CO3, solution would neutralize ethanoic acid forming sodium acetate in the aqueous layer. A calcium chloride solution, CaCl2, would mix with the ethanol in the aqueous layer. Most of the ester would be in a separate layer on top of the water layer. The l...

chemistry
Here an outline of the solution. The answers to the answers in each step should have at least four significant figure. 1. Convert the grams of CO2 and H2O to moles 2. Moles of carbon, C, equals the number of moles of CO2. Convert the moles of C to grams of C. 3. Moles of hydro...

Chemistry
mass = density x density or M = DV Applying this to water, 36.84g = (0.9970g/mL)(V) For chloroform, 41.43g = (x)(V) Dividing the left sides and right sides, we get: 41.43g / 36.84g = (0.9970g/mL) / x (the equal volumes cancel out) Solve the above proportion for x

college biology
A sample containing starch will cause an iodine solution to turn dark blue. A sample containing fats will leave a greasy stain on paper. Simple sugars can be tested with Benedict or with Fehling solutions. The blue color of the test solution will change from yellow to red. Pro...

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