Thursday
December 12, 2013

# Posts by Kelsey

Total # Posts: 476

new american gov't 2
Over time, _____ has gained power at the expense of

Geometry
the angle of depression from D to F measures 40 degrees. If EF= 14 yd, find DE. round answer to nearest 10th

math
John wants to put a lace edge around a square piece of cloth. If the cloth is 4 inches wide on one side, how long of a piece of lace should Melina cut?

Chemistry
Use your value for the heat of neutralization, ∆H, -9490, to determine the amount of heat evolved when 10.00mL of 0.4091 M HCL reacts with 10.00mL of 0.4037 M NaOH.

Chemistry
yes, Al3+ sorry. so the moles=.01380. Could you help with the equation?

Chemistry
0.3724 g x 26.98MW = 10.05 mol -538.4kJ x 10.05 mol = -5410 kJ/mol 5410 kJ/mol of heat is evolved?????

Chemistry
The standard enthalpy of formation of Al3-(aq) is -538.4kJ/mol. How much heat is evolved when 0.3724 g of Al(s) reacts with excess hydrochloric acid?

physical science
Brad rides his bike 20 km. He covers the distance in 45 minutes (0.75 hours). What is his speed in kilometers per hour? A.44 km/hr B.15 km/hr C.9.0 km/hr D.27 km/hr

Calculus
find the second derivative of f(x)=3/(x^2+12)

pre-algebra
when rounding to the nearest cent does it have to be to right or left or does it matter?

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