Wednesday
April 16, 2014

Search: CHEMISTRYYY!!!

Number of results: 21

chemistryyy
Germanium has a cubic unit cell with a side edge of 565pm. The density of germanium is 5.36g/cm^3. What is the crystal system adopted by germaium.
Friday, February 6, 2009 at 8:13pm by Anonymous

chemistryyy
Find the mass in grams in one cell. mass=volume*denstiy volume=(565pm)^3=1.8E-22cm^3 mass=1.8E-22 cm^3*5.36g/cm^3= you do it. Ok, how many Ge atoms is that? Now, given the number of atoms per unit cell, is it face centered, body centered, or simple cubic
Friday, February 6, 2009 at 8:13pm by bobpursley

chemistryyy
http://hyperphysics.phy-astr.gsu.edu/hbase/solids/sili2.html
Friday, February 6, 2009 at 8:13pm by bobpursley

chemistryyy
I get 8 atom/unit cell and the answer in my book was face centered. But i am a bit confused don't FCC have 4 atoms/unit cell?
Friday, February 6, 2009 at 8:13pm by --

chemistryyy
Yes, fcc cells have four atoms/unit cell; however, if y ou look at the link provided by Bob Pursley, you will see two things there. First, the statement that Ge is like diamond and the Ge structure is "two interpenetrating face centered unit cells". I was confused, also, when ...
Friday, February 6, 2009 at 8:13pm by DrBob222

CHEMISTRYYY!!!
Calculate the ph of a 0.20 solution of KCN
Monday, February 23, 2009 at 3:37pm by MMmm

CHEMISTRYYY
consider the following reaction: Mg(s)+ 2HCl(aq) --> MgCl2 (aq)+H2 (g) What minimum amount of 1.75 M HCl is necessary to produce 27.5 L of H2 at STP?
Monday, April 26, 2010 at 5:58pm by Justin

CHEMISTRYYY
Convert 27.5 L H2 at STP to moles. L/22.4 = moles. Using the coefficients in the balanced equation, convert moles H2 to moles HCl. M = moles/L. Convert moles HCl to L.
Monday, April 26, 2010 at 5:58pm by DrBob222

chemistryyy
what are metallic bonds?
Sunday, October 24, 2010 at 10:27pm by Anonymous

chemistryyy
http://www.thefreedictionary.com/metallic+bond
Sunday, October 24, 2010 at 10:27pm by Ms. Sue

CHEMISTRYYY
this isnt the right way. i used this way and i got a different asnwer
Monday, April 26, 2010 at 5:58pm by jose

CHEMISTRYYY
A hydrated aluminium sulphate A12(SO4)3.xH2O, contains 8.10% of aluminium by mass. Find the value of x
Friday, November 19, 2010 at 5:21am by hana

CHEMISTRYYY
Find the molmass of the hydrated molecule. molmass=12Al+3S+12O+xH2+XO where the element symbols are atomic masses. but x*molmassH2O/above= .0810 solve for X, and have fun with algebra.
Friday, November 19, 2010 at 5:21am by bobpursley

chemistryyy
Answer the following two questions about the equivalence point for the titration of 27.8 mL of 0.235 M hypobromous acid (pKa = 8.64) with 0.214 M KOH. 1)Predict if the solution will be acidic, basic or neutral at the equivalence point. 2)Calculate the pH of the solution at the...
Wednesday, September 21, 2011 at 2:49pm by Rachel

chemistryyy
Answer the following two questions about the equivalence point for the titration of 27.8 mL of 0.235 M hypobromous acid (pKa = 8.64) with 0.214 M KOH. 1)Predict if the solution will be acidic, basic or neutral at the equivalence point. 2)Calculate the pH of the solution at the...
Wednesday, September 21, 2011 at 2:59pm by Rachel

chemistryyy
HBrO + KOH ==> KBrO + H2O 1)What do you have at the equivalence point? That is a soln of KBrO. It is the salt of a strong base and a weak acid; therefore, the solution MUST be basic. 2) The pH at the equivalence point is determined by the hydrolysis of the salt...
Wednesday, September 21, 2011 at 2:59pm by DrBob222

chemistryyy
Answered at your other post.
Wednesday, September 21, 2011 at 2:49pm by DrBob222

CHEMISTRYYY!!!
meow
Monday, February 23, 2009 at 3:37pm by grr

CHEMISTRYYY
What is the theoretical yield of ethyl chloride in the reaction of 20.2 g of ethylene with 53 g of hydrogen chloride? (For ethylene, 28 amu; for hydrogen chloride,36.5amu ; for ethyl chloride, 64.5 amu.) What is the percent yield if 23.5g of ethyl chloride is actually formed?
Friday, April 20, 2012 at 12:51pm by Anonymous

CHEMISTRYYY
This is a limiting reagent problem. How do I know that? Because amounts for BOTH reactants are given. Write the equation and balance it. 2a. Convert 20.2 g ethylene to mols. mols = grams/molar mass. 2b. Do the same for HCl. 3a. Using the coefficient in the balanced equation, ...
Friday, April 20, 2012 at 12:51pm by DrBob222

chemistryyy
The escape velocity of planet earth is 11.2 km/s. At what temperature would helium atoms be able to escape the earth's gravitational pull? (Note: you're calculating the average speed here, which means roughly 50% of the atoms would escape at any given time)
Thursday, March 6, 2014 at 7:41pm by tricia

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