Thursday
December 12, 2013

# Posts by Alan

Total # Posts: 320

Chemistry
Cu(NH3)2^+ is a colourless compound. Will there be any absorbance at 600nm?

math
h(x) = 1.95 x + 72.85 h(x) = 1.95(35) + 72.85 h(x) = 141.10

apchem
For a typical commercial vinegar with a 5% acetic acid content, the density is about 1.01 grams per milliliter.

apche,m
For a typical commercial vinegar with a 5% acetic acid content, the density is about 1.01 grams per milliliter.

spelling
The plural of family is families. So the first sentence is right.

Chemistry
What is the colour of: 1. Cu+ 2. Cu2+ 3. Cu3+?

Chemistry
Aspirin equilibrium is : HC9H7O4(aq) + H2O (double arrow)C9H7O4^-(aq) + H3O^+ You have 2 tablets each containing 0.325g of active ingredient that you dissolve in water up to 225ml. Calculate the pH.

Math
x + 2y =1 --- (1) 8x + 8y =4 --- (2) From (1), x + 2y = 1 x = 1 - 2y --- (3) Sub (3) into (2), 8 (1-2y) + 8y = 4 8 - 16y + 8y = 4 -8y = 4 - 8 -8y = -4 y = -0.5 sub y = -0.5 into (3), x = 1 - 2(-0.5) x = 1 + 1 x = 2 CHECK: sub x = 2 and y = -0.5 into (1), 2 + 2(-0.5) = 1

math
-6x + 3 =-7 - 5x -6x + 5x = -7 - 3 -x = -10 x = 10

Physics
energy of 1 photon = (Plank constant x speed of light, c) / wavelength = 6.626 x 10^-34 x 2.998 x 10^8 / 2 x 10^-1 = 9.93 x 10^-25 J energy of 10^12 photons = 9.93 x 10^-25 x 10^12 = 9.93 x 10^-13 J

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