Chemistry - October 2006

2006-10-04 01:00:27 · 4 answers · asked by SmoOth 1

calculate the amount of strong cetrimide solution (40%w/v) required to make 200ml of cetrimide solution 1%w/v.

2006-10-04 00:37:55 · 15 answers · asked by pharmacy565 1

2006-10-04 00:12:49 · 9 answers · asked by Anonymous

An elderly cousin was telling me about a large barrel or vat that was situated outside her house in upstate New York in the early 1900's. The vat/barrel contained a white substance that provided an off-gassing that supplied fuel for gas lamps used in homes. Would anyone know what this substance/process might have been?

2006-10-04 00:03:10 · 3 answers · asked by Anonymous

There are two questions. I think I may have the answer...yet I'm not complete on them. And It is due this morning..and the prof. wasn't at office hours yesterday.

(1) concentrated phosphoric acid is 85.0 % H3PO4 by mass. The density of the solution is 1.70 g/mL. What volume is required to provide 2.50 grams of H3PO4?
_________en.

(2) What is the maximum yeild of isopentylacetate that can be prepared from 3.58 g of isopentanol and 4.75 g of acetic acid?
___________________g.

I would appreciate the help very much.

2006-10-03 23:12:16 · 1 answers · asked by ibrakeforchucknorris 1

Is iodometry okay?

2006-10-03 22:44:45 · 1 answers · asked by kriZia 2

2006-10-03 22:14:59 · 25 answers · asked by Dola 1

2006-10-03 21:21:20 · 22 answers · asked by mr_zot 2

2006-10-03 21:19:15 · 4 answers · asked by Anonymous

2006-10-03 20:36:42 · 3 answers · asked by chem 1

Calculate the root mean square velocity for the O2 molecules in a sample of O2 gas at 25.0°C. (R = 8.3145 J/K · mol)

2006-10-03 20:23:15 · 5 answers · asked by jasmine m 1

why is energy required for the melting or boiling process ?

2006-10-03 19:50:17 · 4 answers · asked by Anonymous

>>>Water dissociates into H+ and OH- each having conc of 10^-7 but acid adds more H+ ions. Even if the reaction proceeds in reverse direction there cannot be a limit to added H+ ions as they are being added externally.
>>>If h+ ion conc refers only to the ions produced by pure water when acid is mixed then why is it that for solving numericals we use conc of acid with no reference to water. Eg pH of 10^-3 Molar HCl is 3.

2006-10-03 19:09:35 · 3 answers · asked by Anonymous

2006-10-03 18:57:56 · 21 answers · asked by Anonymous

why is energy required for the melting or boiling rocess

2006-10-03 18:46:07 · 3 answers · asked by Anonymous

how does an exothermic reaction differ from an endothermic reaction?

2006-10-03 18:45:08 · 3 answers · asked by Anonymous

redox reaction

2006-10-03 18:32:47 · 4 answers · asked by know it all 1

2006-10-03 18:31:24 · 1 answers · asked by MeMe123 2

Is the 93.67 g/mol the correct answer?

2006-10-03 17:46:58 · 3 answers · asked by chemistrygirl 1

2006-10-03 17:46:57 · 3 answers · asked by ChEMIsTrY ChICkiE 1

what you mean by hard water ?

2006-10-03 17:41:21 · 7 answers · asked by pinky 1

2006-10-03 17:36:06 · 2 answers · asked by Rodeocrazy1 1

2006-10-03 17:33:06 · 1 answers · asked by Rodeocrazy1 1

Acid strength decreases in the series: strongest HSO4– > HF > HCN. Which of the following species is the weakest base?

A) HF
B) SO42–
C) F–
D) CN–

I got B, because the stronger the acid the weaker its base, right? Thanks

2006-10-03 16:56:51 · 1 answers · asked by axcryingxshame 1

it is for chemistry i have a project on it and the cube i measured is in the class i forgot to measure its height can you help me please! i am to find the density of the cube useing these calculations.

2006-10-03 16:52:50 · 4 answers · asked by big papy 3

We have reason to believe that during a paternity test for a child custody case that the mother may have replaced the alleged fathers swabs with her own since she was not tested. She worked at the lawyers off the test was done at and the envelope with test was handed to her unsealed. The test for the mother was missing from the kit. Is it possible to tell if the DNA submitted on the swab was from a male or female? Would that require additional testing or does anyone know if that is part of the standard DNA paternity testing?

2006-10-03 16:31:42 · 4 answers · asked by J C 1

I am in chemistry, and we've been learning about mass, volume, and density. I have a few jems that I need to weigh in either grams or carats, and I was wandering how I could find the mass of these objects without using a triple beam balance. i would like to be able to use a normal house-hold appliance.

2006-10-03 15:54:54 · 6 answers · asked by Che Revis 1

2006-10-03 15:30:35 · 4 answers · asked by Karan S 1

2006-10-03 15:28:48 · 3 answers · asked by steff 1

2006-10-03 15:22:21 · 6 answers · asked by Anonymous