Questions About: Chemistry
The rate constant for a certain reaction is k 1.90×10−3 s^-1. If the initial reactant concentration was 0.700 M, what will the concentration be after 18.0 minutes A zero-order reaction has a constant rate of 2.60×10−4 M/s. If after 40.0 seconds the concentration has dropped to 2.00×10−2 M, what was the initial concentration?
Mon, 06 Feb 2012 08:53:53 GMT
can anyone give me a list of sites for the following_-? i know some of them are co relating but still. science technology(gadgets) space technology give as many sites as you like updates on physics updates on chemistry research on modern physics
Mon, 06 Feb 2012 08:43:56 GMT
Considering killing myself. I know that cyanide salts are the best for poisoning, but the labs don't have any. (I do undergraduate chemistry research, so I have 24/7 access to the chem labs). The closest cyanide chemical I have is CuCn. It is insoluble in water.
should I poison myself? Put it in food and eat it? Will suicide by this method be as painless as with the salts? Any chemistry buffs out there? Don't try to talk me out of it, I don't want to hear it. I will ignore all answers that try.
should I poison myself? Put it in food and eat it? Will suicide by this method be as painless as with the salts? Any chemistry buffs out there? Don't try to talk me out of it, I don't want to hear it. I will ignore all answers that try.
Mon, 06 Feb 2012 07:52:28 GMT
What types of acid, other than Hydrochloric Acid (HCL), will effectively dissolve calcium carbonate?
I was considering Hydrofluoric Acid; will that be effective? I am doing an experiment in chemistry to find the percentage of calcium carbonate in an eggshell.
Mon, 06 Feb 2012 07:43:57 GMT
1. Calculate the volume occupied by 2.01 x 10^23 molecules of 02 at STP. 2.5.00L of Ne gas at slc when it is heated to a temperture of 40 deg celcius and a pressure of 2.0 atm
Mon, 06 Feb 2012 07:40:30 GMT
2. Propane gas (C3H8) burns completely in the presence of oxygen gas (O2) to yield carbon dioxide gas (CO2) and water vapor (H2O). Write a balanced equation for this reaction. Assuming that all volume measurements occur at the same temperature and pressure, how many liters of oxygen will be required to completely burn 0.700 L of propane gas? Assuming that all volume measurements occur at the same temperature and pressure, how many liters of carbon dioxide gas will be produced in the reaction? Assuming that all volume measurements occur at the same temperature and pressure, how many liters of water vapor will be produced in the reaction
Mon, 06 Feb 2012 07:31:14 GMT
A hydrate of NiSO4 is to be analyzed. A sample of the hydrate is weighed in a clean, dry and covered crucible.
mass of the crucible and sample is 34.1785 g.
empty, the crucible and cover are heated to a constant weight of 30.9677 g.
crucible with sample is heated (to drive off the water of hydration) to a final constant weight of 32.8717 g. Calculate the following from the data given above: 1.Mass of hydrate sample 2.Mass of water driven off by the heating 3.Mass of the anhydrous NiSO4 4.Percent water in the hydrate 5.Moles water in the sample 6.Moles NiSO4 in the sample 7.Ratio of moles H2O to moles NiSO4 (rounded to a whole number) 8.Formula of the hydrate 9.Percent water as determined from formula 10.% error assuming water from formula to be the accepted valu
mass of the crucible and sample is 34.1785 g.
empty, the crucible and cover are heated to a constant weight of 30.9677 g.
crucible with sample is heated (to drive off the water of hydration) to a final constant weight of 32.8717 g. Calculate the following from the data given above: 1.Mass of hydrate sample 2.Mass of water driven off by the heating 3.Mass of the anhydrous NiSO4 4.Percent water in the hydrate 5.Moles water in the sample 6.Moles NiSO4 in the sample 7.Ratio of moles H2O to moles NiSO4 (rounded to a whole number) 8.Formula of the hydrate 9.Percent water as determined from formula 10.% error assuming water from formula to be the accepted valu
Mon, 06 Feb 2012 07:19:59 GMT