Number of results: 26,320
This is a hard one. I'll do my best to try and translate =) A sour liquid mixture (many H+) contains Fe2+ ions and is being titrated with 0,0202M MnO4-. At the end of the titration, the amount of MnO4- that had been used up was 20cm3. How much was the mass of Fe2+ in the first...
Friday, September 8, 2006 at 3:16pm by avant
Whats the difference between decomposer,consumer,and producer? give an example of each and tell how producers make their own food. I looked in my book but it just doesnt say anything about any of those 3 things!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! For food: A producer grows/makes...
Saturday, September 9, 2006 at 4:10pm by julie
I need help with a question about chemistry!!!!!!!!!!! I know that motor oil comes in various grades but is it a homogeneous mixture or a compound? Motor oil, as used for lubrication in cars and other such devices, is a homogeneous mixture. It is mostly oil but it has ...
Saturday, September 9, 2006 at 7:03pm by John
Why is motor oil a homogeneous mixture? Consider removing a spoonful of oil from a freshly opened can. Now remove another spoonful. Both will contain the same thing. That is homogeneous. A chocolate chip cookie, for example, is not homogeneous because we can break off a piece ...
Saturday, September 9, 2006 at 7:14pm by John
how can we reduce trash in our school What Can You Tell Me About Iron And Sulphur? My B F Is Stacey!! It would be more effective to present your question using the <Post a New Question> link. Since this is not my area of expertise, I searched Google under the key words "...
Friday, September 22, 2006 at 2:06am by marcia
Could you please give me a discriptive answer and explain what each term means? I have a hard time understanding chemistry. Thanx q1 In a reaction between aqueous solutions of calcium chloride and sodium carbonate, a precipitate is formed. The experimental procedure which can ...
Thursday, September 28, 2006 at 4:04pm by Brittany Rusk
Chemistry - Heat of Fusion of Ice
Conclusion question(s) from a lab we did to find the heat of fusion of ice: Does the value obtained for the molar heat of fusion depend on the volume of water used? Does it depend on the mass of ice melted? Does it depend on the final temperature of the mixture? The heat of ...
Sunday, October 1, 2006 at 2:11pm by J.M.
A breathing mixture used by deep-sea divers contains helium, oxygen, and carbon dioxide. What is the partial pressure of oxygen at 101.4 kPa ifpHe = 82.5 kPa and pCO2 = 0.4 kPa
Tuesday, July 29, 2008 at 1:11pm by natasha
In order to obtain pure synthetic plant hormone, a 2:1 mixture of water and ethanol is used as the crystallizing solvent. Why is a solvent mixture used? A. Organic compounds are not soluble in pure ethanol. B. Ethanol and water have similar boiling points, so concentration is ...
Friday, March 6, 2009 at 5:12am by nilee
Let the amount of the $6 mixture used be x kg let the amount of the $8.80 mixture be 16-x kg then 6x + 8.8(16-x) = 6.7(16) solve for x
Saturday, November 7, 2009 at 7:02pm by Reiny
I used 10mL of unknown NaCl-NaBr mixture titrate with 0.10M silver nitrate solution. 10.15mL of silver nitrate solution is used. the conc. of NaCl-NaBr mixture is 8g/dm3 I need to calculate the % composition of the NaCl-NaBr mixture. I used the following calculation steps but ...
Thursday, April 29, 2010 at 1:34pm by albee
a student was asked to determine the components of a mixture of potassium bromide (KBr), magnesium hydroxide, Mg(OH)2, and barium sulfate (BaSO4). The mass of the sample of the mixture used was 3.21 g
Tuesday, June 1, 2010 at 12:04pm by holla
Mole fractions in a liquid mixture:
Acetone, C3H6O, and ethyl acetate, C4H8O2, are organic liquids often used as solvents. At 30 degrees C, the vapor pressure of acetone is 285 mm Hg and the vapor pressure of ethyl acetate is 118mm Hg. the solution is prepared at 30 degrees C by dissolving 27.0 g of acetone in ...
Thursday, September 2, 2010 at 4:37pm by Sar
A sample of a breathing mixture for divers contained 34.3% helium, He; 51.7% nitrogen, N2; and 14.0% oxygen, O2 (by mass). What is the density of this mixture at 22°C and 748 mmHg?
Sunday, October 24, 2010 at 8:39pm by caroline
A bearthing mixture used by deep-sea divers contains helium, oxygen, and carbon dioxide. What is the partial pressure of oxygen at 1.2 atm if PHe = 0.98 atm and PCO2 = 0.04 atm? a) 1.02 atm b) 0.12 atm c) 0.94 atm d) 0.18 atm
Wednesday, March 16, 2011 at 5:19pm by Logan
A sample of a breathing mixture for divers comtained 34.3% helium, 51.7% nitrogen, and 14% oxygen, by mass. What is the density of this mixture at 22degree celcius and 755mmHG?
Tuesday, May 24, 2011 at 2:26pm by Vicky
Orgo lab 1
Just to answer myself, since I know now: get the volume of spike in temperature registered and that mL volume divide by the total volume of mixture used then multiply by 100%.
Monday, June 13, 2011 at 2:59am by Lola
A fuel mixture used in the early days of rocketry is composed of two liquids, hydrazine (N2H4) and dinitrogen tetraoxide (N2O4), which ignite on contact to form nitrogen gas and water vapor. 2 N2H4 + N2O4 --> 3 N2 + 6 H2O If 1.50 x 102 g of N2H4 and 2.00 x 102 g of N2O4 are...
Sunday, November 4, 2012 at 7:38pm by Sheree'
Physics, Chemistry, Science
• The majority of gas used in most SCUBA tanks is compressed air. This air is composed of the same elements everywhere - 21% Oxygen 79% Nitrogen. Advanced SCUBA divers may use an "enhanced" mixture of 32% (up to about 40%) Oxygen with the balance being Nitrogen. The number of ...
Monday, November 18, 2013 at 11:30pm by Elena