Thursday

January 19, 2017
Total # Posts: 12

**CHM 300**

if the pKa of HCN is 9.21,what it its Ka?

*October 1, 2014*

**Chemistry**

we would build one spectrometer apparatus with webcam to analyze two different beers based on yeast or bitterness so which one would be easy/less time to analyze yeast or bitterness ? please expalin why :S

*September 29, 2014*

**Chemistry**

the standard free energy change for a chemical reaction is +13.3 kj/ mol. What is the equilibrium constant for the reaction at 125 degree C ? (R= 8.314 j/mol )

*April 4, 2012*

**Help ?**

Two carts, A and B, are connected by a rope 39 ft long that passes over a pulley P (see the figure). The point Q is on the floor h = 12 ft directly beneath P and between the carts. Cart A is being pulled away from Q at a speed of 3.5 ft/s. How fast is cart B moving toward Q at...

*March 8, 2012*

**Sociology....**

Explain why is the best method for studying human social development is by using Piaget's Theory of Cognitive Development?

*March 6, 2012*

**Calculus**

A right triangle with hypotenuse y and equal legs of size x has a perimeter of 36m. Express the area of the triangle solely in terms of the hypotenuse y.

*February 26, 2012*

**Calcules**

Find the following limit using algeraic manipulations. (Give excat asnwers). lim (4t^2 -t-1)/(t^2 -1) t--> -1

*February 26, 2012*

**Calcules**

Find thllowing limits using agebraic manipulations. a) lim (4t^2 -t-1)/(t^2 -1) = ? t--> -1

*February 26, 2012*

**Calcules**

find y" by implicit differentiation. 4x^3 + 3y^3 = 4 ===================================== 4x^3 + 3y^3 = 4 12x + 9yy' = 0 24x + 9(2yy')y' + 9y^2(y") = 0 y" = -6[4x-3y(y')^2] answer. (it this right? )

*February 25, 2012*

**Calc..Help Please**

A model for the length of daylight (in hours) in Philadelphia on the t th day of the year is L(t)= 12+2.8 sin[2pi/365(t-80)] Use this model to compare how the number of hours of daylight is increasing in Philadelphia on March 21 and May 21. (Assume there are 365 days in a year...

*February 20, 2012*

**Calc...**

Find the derivative of 7^(2-x^2)

*February 19, 2012*

**Chemistry**

What is the equilibrium partial pressure of water vapor above a mixture of 37.5 g H2O and 62.5 g HOCH2CH2OH at 55 degree C. The partial pressure of water at 55 degree C is 118.0 mm Hg. Assume ideal behavior for the solution.

*February 19, 2012*

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