Wednesday
October 22, 2014

Posts by Adele


Total # Posts: 11

Physical Science
On a hot summer day (30 degrees Celcius), a pesky little mosquito produced its warning sound near your ear. The sound is produced by the beating of its wings at a rate of about 600 wing beats per second. What is the frequency in Hertz of the sound wave? What is the wavelength ...
May 6, 2012

Physics (College)
99.6%
November 26, 2011

Chemisty
How many grams of sodium bicarbonate mut be decomposed by: HCl (ag) + NaHCO3 (ag) ----> NaCl (ag) + CO2 (g) + H2O (l) to yield 75.0 mL of carbon dioxide at STP?
April 23, 2011

Chemistry
I started to use PV=nRT. So, n = (.930 atm)(.04852 L) ------------------ = 1.86 x 10^ -3 (.0821) (296 K) mol I multiplied that by 84 g/mol (molar mass of sodium bicarbonate) and then by 100%....which equated to 15.62%. That seems off to me. Do you know what I'm doing wrong?
April 23, 2011

Chemistry
A 3.23 gram sample of a sodium bicarbonate mixture was reacted with excess acid. 48.52 mL of the evolved gas was collected of the water at .930 atm. and 23.0 degrees C. What is the percentage of sodium bicarbonate in the original mixture?
April 23, 2011

ap chemistry
Cl2 + 2koh-->kcl _kclo +H2O 3KClo-->2Kcl+kclo3 4kclo3-->3kclo4 +kcl what mass of cl2 (g) is required to make 234g kclo4
October 18, 2010

Chemistry
The amount of solar radiation recieved anually in arizona is about 8.4 x 10^6 KJ/m^2. What mass of carbon must be burned into carbon dioxide to produce the same amount of energu in the following reaction? C + 02 --->CO2 deltaH=-393.5Kj
April 29, 2010

maths
i need to factorise 4 cos squared theta + 2 cos theta - 1
March 21, 2010

bio
what is the adaptive value of having the organ of gas exchange - in this case, the alveolus - inside the body?
March 17, 2010

English
So I'm a bit confused. What's the difference between penance and penitence? Are they essentially the same thing? Thank you everyone.
March 4, 2009

economics
A perfectly competitive painted necktie industry has a large number of potential entrants. Each firm has an identical cost structure such that long-run average cost is minimized at an output of 20 units. The minimum average cost is $10 per unit. Total market demand is given ...
January 30, 2009

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