Saturday
December 7, 2013

# Posts by Stacey

Total # Posts: 255

Chem
what is the oxidation number on each of these ions - Ag2S + 2Al - 6Ag + Al2S3 Can you show your work? Thanks a bunch:)

Physics
A ladder 10-m long and weighing 50 N rests against a smooth vertical wall. If the ladder is just on the verge of slipping when it makes a 50 degree angle with the ground, find the coefficient of static friction between the ladder and the ground.

chem
How many moles of base are needed to neutralize 2 mol of acid for HNO3 + KOH - KNO3 + H2O?. Can u show your work please:) Thanks a bunch

math
How would you simplify this rational expression: Can you please show me the steps on how you get the answer thank you. 2y+1 over y-2 times (4-2y)

Chem Dr Bob
So your saying that sulphuric acid is used to test lead in water?

chemistry
Please I need help...I have been trying so hard to finad this answer... Suggest a test chemical that can be added to the water sample to precipitate the lead(II) ions. please show a chemical eqaution for the formation of the precipitate. Thank u so much:)

Chemistry
If 0.00002 mol of Na2S is the limiting reactant...how do I calculate the maximum mass of precipitate formed?

Math Check
I don't understand how you got to that answer

Math Check
y^2-5y over y^2-7y+10 What did I do wrong.. for my answer i got (y+5) over (y-2) and the correct answer is y over (y-2)??? How would you do this problem? 3x over x+1 = ? over x^2-x-2

math check
Simplify each rational expression. 3a(a-4)^2 over a^2(a-4) I don't understand how the answer would be 3(a-4) over a because the a-4 would cancel out??? 4-y^2 over y^2-2y once I simplify I get (2-y)(2+y) over (y-2)(y+2) I don't understand how the answer is -(y+2) over y...

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