Recent content by ada0713

any help please?

I have two questions regaring my homework assignmnet 1) Is there a "spontaneous process" where the "entropy of the surrounding" decreases? If so, what kind of reactions (or process) falls into this category? I was trying to think of something but couldn't/ 2) and this was is just to...

finding volume by integration Homework Statement Consider the region bounded by y=e^x, the x-axis, the y-axis, and the line x = 1. A solid is created so that the given region is its base and cross-sections perpendicular to the x-axis are squares. What is the volume of a slice perpendicular...

anyone?

oh.. NH4+ is not a strong acid.. how do I approach this problem then? If K>1, net direction is right, then shouldn't the reactants be stonger acid and stronger base?

Consider the following solutions and their respective pH values. Which substance would be effective(K>1) for the deprotonation of NH4+ ? 0.1 M A, pH = 6.85 0.1 M B, pH = 7.22 0.1 M C, pH = 8.34 0.1 M D, pH = 11.88 1) A 2) B 3) C 4) D 5) none are effective If the reaction to...

Does anyone know how to slove this question?

Homework Statement Stearic acid, nature's most common fatty acid, dimerizes when dissolved in hexane: 2C17H35COOH --> (C17H35COOH)2 H°rxn = -172 kJ The equilibrium constant for this reaction at 28°C is 2900. Estimate the equilibrium constant at 38°C. 1) 4.7 *10^5 2) 1.9 * 10^3...

But the first one seems to be more complicated.. how do I find height of the rectangle?

Okay.. I think I got the second one (with right triangle slice) The "base" of the triangle should be sqrt((R^2-x^2)) (<- I got this from x^2+y^2=R^2) and the "height" of the trangle is going to be sqrt((R^2-x^2))*tanα (since tanα = height/base.. and you know "base" from above.. so you solve...

I think the curve should be a circle because the radius is indicated as "r" in the picture.

Can you see it now?

http://img408.imageshack.us/my.php?image=picture20017hu6.jpg The attachement contains both problem and the attemp at a solution. Specifically, I am stuck on finding the equation for the height for each solid. (height "a" for both solids) Should I just set up a random letter to indicate the...

When you add more solid NaOH,, more CO2 molecules will react with NaOH; thus, decreasing the moles of CO2.. Am I right,,? But still, does solid really have anything to do with this? I don't think I understand the reason why we don't include solid in equilibrium constant

Homework Statement The following reaction is at equilibrium at one atmosphere, in a closed container NaOH(s) + CO2(g)-> NaHCO3 (s) which, if any, of the following actions will decrease the total amount of CO2 gas present at equilibrium? 1)decreasing the volume of the container 2) none...