April 24, 2014

Search: chemstry

Number of results: 29

Friday, January 28, 2011 at 8:42pm by adsdf

name Fe 2+ according to the stock system
Sunday, March 2, 2008 at 9:20pm by john

the reaction of fe(metalic) in sponge iron
Friday, February 26, 2010 at 12:26pm by vibek

i need help with chapter 5.1 for a chemstry review.
Thursday, March 3, 2011 at 8:36pm by marie

How could you tell if a compound consistd of ions if it does not dissolve in water?
Friday, March 28, 2008 at 5:32pm by ss

when the equation is balanced, the lowest whole number coffinent for hydrogen is?
Wednesday, December 12, 2012 at 10:44pm by los

calculate the amount of energy required to convert 55.0g of ice at -10.0c into steam at 125c?
Thursday, November 29, 2012 at 2:32pm by celeste

What mass of sucrose must be taken for solution weight of 200 g, which is equal to molality 0.05 mol / kg?
Thursday, November 15, 2012 at 12:37pm by michelle

How long will it take 200 mg of carbon-14 to decay to the point where only 75 mg remain if the half-life is 5770 years?
Thursday, October 31, 2013 at 10:14am by jordan

How long will it take 200 mg of carbon-14 to decay to the point where only 75 mg remain if the half-life is 5770 years?
Thursday, October 31, 2013 at 1:02pm by jordan

Classify six kinds of amino acids according to the functions that they serve in the human body, stating an example for each class.
Monday, January 21, 2013 at 5:49pm by zachary

4NH3+5O2--->4NO+6H2O determine the amount of oxygen needed to produce 1.2x10^4mol of nitrogen monoxide gas
Tuesday, September 20, 2011 at 10:20pm by Sven

How many moles of NaCL are contained in .2570 L of a 37.5 mM Solution of NaCl?
Sunday, May 1, 2011 at 8:26pm by Jann

How many grams of CaCl2 would be dissolved in 1.4 L of a 0.11 M solution of CaCl2?
Tuesday, March 11, 2014 at 10:20pm by yanely

What is the structure of N4O, where the 3 nitrogen bonds have different bond lengths and the N=O bond is a double bond. I just dont get it
Tuesday, November 9, 2010 at 6:56pm by Phil

the hiv virus that causes aids destroys the immune system in the body. classify the hiv virus and explain the statement
Tuesday, January 29, 2013 at 9:55am by zachary

the most prominent line in the spectrum of an element is 267.2 in what region of the electromagnetic spectrum is this line found
Sunday, March 16, 2014 at 7:36pm by Anonymous

A 5.00 gram mixture of CaO and CaCO3 is heated strongly. After heating, the mixture has a mass of 4.00 grams. What % of the original mixture is CaCO3?
Monday, December 13, 2010 at 9:09am by Paul

A 4.1089 g piece of aluminum wire with a circular cross section is 42.06 cm long and has density of 2.6989 g/cm3. What is the volume of the wire and the cross sectional area of the wire in cm2?
Monday, September 17, 2012 at 8:15pm by anonymous

Mercury concentration in a polluted lake is 0.0125 micrograms/L. What is the total mass in kilograms of mercury in the lake if the lake is approximately circular witha diameter of 10 miles and an average depth of 50 ft.?
Wednesday, August 31, 2011 at 11:11pm by Gabrielle

. A 25.0 ml sample of Ni2+ gave a weight height of 2.36 uA( corrected for a residual current) in a polarographic analysis. When 0.500 ml of solution containing 28.7 nmol of Ni2+ was added the wave height increased to 3.79 uA. Find the concentration of Ni2+ in the unknown?
Saturday, November 22, 2008 at 12:26pm by ABDULALEH

Chemstry Help Drbob!
How much heat (in kJ}) is required to vaporize it? (Assume a density of 1.00 g/mL ) I have this 60.0ML/ 1.00 g/ml = 60grams 60/153/81 g/mol = .3900916715 moles .3900916715 moles / 43.9 kj/mol = 17.122 And it keeps telling me the answer is wrong.
Sunday, January 25, 2009 at 9:41pm by Creative9k

Dry air is bubbled through 25 litres of water at a rate of 15 litres (STP)/min. The air leaving the liquid is saturated with water at 25 degrees celcius and 1.5 atm. How long it will take for all of the water to vaporize.
Sunday, August 5, 2012 at 3:12pm by Simon

In a constant-pressure calorimeter, 50.0 mL of 0.340 M Ba(OH)2 was added to 50.0 mL of 0.680 M HCl. The reaction caused the temperature of the solution to rise from 23.69 C to 28.32 C. If the solution has the same density and specific heat as water, what is H for this ...
Thursday, June 21, 2012 at 5:40pm by cassie

Lovastatin (C24H36O5) has a molar mass of 404.53 g/m. The normal dose of the drug lovastain is 20mg. How many molecules of lovastatin (C24H36O5) are in a normal dose?
Thursday, February 24, 2011 at 10:49pm by Michelle

. A small amount of solid Hg2Cl2 and 25 ml of metallic mercury were added to a solution of 5.03 x 10-2 M NaCl. A platinum electrode immersed in the layer of mercury was connected to a reference half-cell whose electrode potential was 0.222V. The voltage of the cell was 0.121 V...
Saturday, November 22, 2008 at 12:25pm by ABDULALEH

For the reaction A(g) + B(g) <==> C(g) + D(g) the equilibrium constant K is defined as K = Y(sub y) * Y(sub D) / (Y (sub A) * Y(sub b)) where y is the molar fraction of the gas phase of a species At 620.00 K, the equilibrium constant is 1.100. Suppose the feed to a ...
Wednesday, July 11, 2012 at 12:32am by Simon

Chemstry/(microsoft excel)
I am having a hard time solving this problem. The formula given is: T=Tin - (Tin - Tinit.)e(-v/v)t If the initial temperature Tinit is 115 (degrees F), the cold water temperature is 35 (degrees F) (1.7 degrees C), and the volume and volumetric flow rate are 3,000 liters and ...
Monday, September 26, 2011 at 12:01am by Kadeem

I just copied this because i have a couple more questions on this part.... Sulfuric acid/ Lead Battery: -the electrodes for the battery are composed of Pb(s), PbO2, and/or PbSO4. What are the half reaction occuring at each electrode? include electrolysis of water: Process ...
Monday, April 28, 2008 at 8:32pm by Sara

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