Number of results: 79
How many grams are thee in 2.3times 10to the 23 power What units are you measuring with 2.3 * 10^23? Are they pounds, ounces, kilgromas or something else? Without this information, it is impossible to answer your question. Please repost with the needed information, so we can ...
Friday, January 5, 2007 at 10:45am by taylor
A SAMPLE OF 5.5L OF ARAGON DAS IS STORED IN A SYLINDER AT A TEMPERATURE OF 32.2C AND A PRESSURE 8.42 ATM. THE SAMPLE IS TRANSFERED COMPLETELY TO ANOTHER 2.8L CYLINDER. SEVERAL HOURS AFTER THE TRANSFER THE SECOND CYLINDER HAS OBTAINED A TEMPERATURE OF 60C. WHAT IS THE PRESSURE ...
Monday, January 8, 2007 at 10:05pm by TIFFANY
what mass of protons would be required to just neutralize the charge of 1.0g of electrons? how do I answer this? You know the mass of an electron. Calculate how many are in 1 gram. You will need the same number of protons. Knowing the mass of a proton calculate the number ...
Thursday, February 8, 2007 at 12:48pm by Chris
Could anyone give a web about 1.Practical arts 2.Greek theory 3.Alchemy 4.Plogiston 5.Modern Chemisry Thanks:-) These are such broad subjects. My suggestion: Go to www.google.com and type in what you want to find. You will find, literally, thousands of links. The more specific...
Tuesday, July 10, 2007 at 8:06am by James
Use chemical principles of atomic structure and or chemical bonding to explain each of the following. 1. At 25.0 degrees C and 1atm, F2 is a gas, whereas I2 is a solid. 2. The melting point of NaF is 993 degrees C, whereas the melting point of CsCl is 645 degrees C.
Sunday, January 27, 2008 at 7:17pm by Josh
These are thought questions. We shall be happy to critique your thoughts.
Sunday, January 27, 2008 at 7:17pm by DrBob222
How does the precision of a calculated answer compare to the precision of the measurements used to obtain it?
Sunday, April 27, 2008 at 7:15pm by paul
The answer is no more precise than the measurements.
Sunday, April 27, 2008 at 7:15pm by DrBob222
science help chemisry
I am doing my study guide for chem test - I cant find a good understadable answer for these 3 1. What is your definition of electrolysis? 2. How do you separate pure substances? 3. My book says mayonnaise is homogenous; teacher told the class it was heterogenous??? HELP
Sunday, October 4, 2009 at 10:01pm by sam
I don't understand what you do after you find out how many electrons are in 1 gram?
Thursday, February 8, 2007 at 12:48pm by stephanie
density and viscosity of a salicyclic acid solution
Sunday, February 14, 2010 at 1:30am by arp
It would depend on the concentration of salicyclic acid in the solution.
Sunday, February 14, 2010 at 1:30am by bobpursley
Why does luis place 3 cups of water without any solute in the freezer? a. if some water spills, he will have extra b. the plain water is the control group c. he wants to know how long water takes to freeze d. the 3 cups of water are unnecessary to the experiment (b)
Friday, February 26, 2010 at 11:16am by mary1111
How are we supposed to know what expriment you are doing? I have no idea why Luis placed three cups in the freezer, much less why they were empty. Perhaps he was having a bad day.
Friday, February 26, 2010 at 11:16am by DrBob222
Estimate the freezing point of 150 cm3 of water sweetened with 7.5g of sucrose (C12H11O22). (Kf for water is 1.86 K kg mol-1; density of water is 1gcm-3)
Tuesday, April 6, 2010 at 2:41pm by Anonymous
moles sucrose = grams/molar mass. Solve for moles. molality = moles sucrose/kg solvent. Solve for molality. delta T = Kf*molality. solve for delta T and from there the freezing point.
Tuesday, April 6, 2010 at 2:41pm by DrBob222
A 0.125 gram sample if a monoprotic acid of unknown molar mass is dissloved in water and titrated with 0.1003 MNaOH. The endpoint is reached after adding 20.77 ml of base. What is the molar mass of the unknown acid?
Tuesday, May 4, 2010 at 10:57am by janny
for the unknown moles = mass/RMM we have the mass, but we need the number of moles to find RMM so number of moles of NaOH used is 0.1003 x 20.77/1000 this is the same as the number of moles of the unknown as it is a monoprotic acid. substitute the number of moles and the mass...
Tuesday, May 4, 2010 at 10:57am by Dr Russ
A technician needs to determine the concentration of lead ions in a sample of water a) Suggest a test chemical that can be added to the water sample to preciitate the lead ions. Show a chemical euation for the formation of the precipitate b) after a precipitate forms, it is ...
Monday, August 16, 2010 at 7:09am by Kelsey
2NaHCO3 --- Na2CO3 + H2O + CO2 2Fe + 6 HCl -- 2 FeCl3 + 3H2 2HBr + Ca(OH)2 -- CaBr2 + 2H2O N2 + 3H -- 2NH3 2H2O -- 2H2O + O is this a redox ? what is oxidized, reduced
Wednesday, August 25, 2010 at 9:46am by Kelsey