Sunday
December 21, 2014

Posts by Massiel


Total # Posts: 14

chemistry
The half live of Iodine-131 is 8 days. if you started out with 40 mg sample of iodine-131, then what would be the mass of the sample after 32 days? please show your work
July 28, 2014

Differential Equations!
I'm struggling solving this separable differential equations: (du/dv) = ((uv+u)/(uv+v)) I multiplied both sides by dv to get on the left side just du and cancel out dv, but after that don't know where to go. I've tried integration by parts but it doesn't look ...
January 13, 2013

physics
A sphere is fired downwards into a medium with an initial speed of 40 . Part A If it experiences a deceleration of , where is in seconds, determine the distance traveled before it stops.
September 19, 2011

probability
My daughter had the same problem today... The probability is 1/3... If its a fair game then all of the factors have equal opportunity to occur.
May 3, 2011

chemistry
A sound power level reading of 127 dB was taken near a construction site where chippers were being used. When all but one of the chippers stopped working, the sound power level reading was 120 dB. Estimate the number of chippers in operation when the reading of 127 was ...
April 26, 2011

algebra
thanks!
April 26, 2011

algebra
A sound power level reading of 127 dB was taken near a construction site where chippers were being used. When all but one of the chippers stopped working, the sound power level reading was 120 dB. Estimate the number of chippers in operation when the reading of 127 was ...
April 26, 2011

chemistry
Thanks!
April 24, 2011

chemistry
If in August 1911 Mme. Curie prepared an international standard containing 20.00 mg of RaCl2, what will the radium content of this standard be in August 2010?
April 24, 2011

chemistry
The activation energy for the reaction in which CO2 decomposes to CO and a free radical oxygen atom, O, has activation energy of 460 kJ mol^-2. The frequency factor is 2 x 1011 s^-1. What is the rate constant for this reaction at 298 K?
March 20, 2011

chemistry ASAP please!!
I got it!!! the answer is 4.6x10^-6
March 20, 2011

chemistry ASAP please!!
One reaction that destroys O3 molecules in the stratosphere is NO + O3  NO2 + O2 When this reaction was studied in the laboratory, it was found to be first order with respect to both NO and O3 with a rate constant of 1.9 x 104 mol L-1S-1. If [NO] = 1.2 x 10-5 mol L-1 ...
March 20, 2011

Environmental engineering
If the BOD5 of a waste is 220 mg/L and the ultimate BOD is 320 mg/L, what is the rate constant?
March 15, 2011

Environmental engineering
Ottawa’s anaerobic digester produces 13 m^3/day of sludge with a suspended solids concentration of 7.8%. What volume of sludge must they dispose of each year if their sand drying beds yield a solids concentration of 35%.
March 15, 2011

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