Chemistry - September 2006

2006-09-22 07:13:07 · 4 answers · asked by furches8 1

2006-09-22 07:09:37 · 7 answers · asked by tweako 1

2006-09-22 07:04:15 · 2 answers · asked by Anonymous

How many grams of F2 are needed to produce 120. g of PF3 if the reaction has a 74.5 % yield?

2006-09-22 06:51:50 · 1 answers · asked by Anonymous

During a titration, the following data were collected. A 25mL portion of an unknown solution was titrated with 1.0 M NaOH. It required 65mL of the base to neutralize the sample. How many moles of acid are present in 3.0 liters of this unknown solution?

2006-09-22 06:51:04 · 8 answers · asked by Anonymous

what is the theoretical yield of carbon disulfide when 110. g of methane is reacted with an equal mass of sulfur.

2006-09-22 06:50:40 · 3 answers · asked by Anonymous

2006-09-22 06:50:34 · 2 answers · asked by Shavon D 1

2006-09-22 06:38:13 · 3 answers · asked by theresa w 1

2006-09-22 05:27:58 · 14 answers · asked by echoalphapapa 2

What would you expect the concentration of toluene to be in the room, assuming the following:

T = 70*F

mass of water = 1.041 pounds/pint

specific gravity (sp gr) of toluene = 0.866 (the ratio of the mass of toluene to the mass of water at the temperature)

2006-09-22 05:26:55 · 2 answers · asked by Anonymous

2006-09-22 05:25:05 · 4 answers · asked by Anonymous

I've been wondering of all the liquids stated, which liquid freezes the fastest? Everyone knows different liquids freezes at different rates. Which liquid do you think freezes the fastest and why?

2006-09-22 04:21:51 · 8 answers · asked by Anonymous

2006-09-22 04:04:54 · 4 answers · asked by Anonymous

can you give me processes or materials which really can help with this problem... Also choose cheap materials

SCIENCE TEACHERS HELP ME !!!!!

2006-09-22 04:03:11 · 3 answers · asked by CARLO 1

2006-09-22 03:51:18 · 3 answers · asked by Tommy B 1

Write an equation for the reaction of calcium hydroxide with ethanoic acid to produce calcuim ethanoate.

2006-09-22 03:27:35 · 6 answers · asked by pieO 4

only the properties no use ty

2006-09-22 02:46:54 · 5 answers · asked by Anonymous

uhmm....the materials should be the least expensive materials that you can find yet very effective still....

2006-09-22 02:34:53 · 1 answers · asked by urbancola 1

Lead is a heavy metal that remains in the bloodstream, causing mental retardation in children. It is believed that 3 x 10(-7)g of Pb in 1.00mL of blood is a health hazard. For this amount of lead..

a) how many atoms of lead are there in 1mL of a childs blood

b) How many moles of lead are in 1L of blood

2006-09-22 02:08:36 · 7 answers · asked by 11 2

Stupid question: I need to do make some solutions and need to know where to get DISTILLED WATER. Is this the same as bottled water like you get from Walmart?

2006-09-22 01:04:47 · 6 answers · asked by crime_scene223 1

2006-09-22 00:54:53 · 1 answers · asked by Anonymous

2006-09-21 23:29:33 · 5 answers · asked by Robert A 3

pewter is an alloy of lead and tin.

2006-09-21 23:16:13 · 4 answers · asked by krsna 1

2006-09-21 22:36:24 · 23 answers · asked by Anonymous

2006-09-21 22:24:24 · 9 answers · asked by freak 1

2006-09-21 21:05:39 · 11 answers · asked by jsn_bobby 1

2006-09-21 19:58:55 · 8 answers · asked by Mummified Foreskin 1

I need to make dilutions. The experiment is for pH and Im having a difficult time understanding. Stock solutions: 0.1 M sucrose; 0.2 M acetic acid; 0.2M sodium acetate; 0.2M anhydrous sodium carbonate; 0.2 M sodium bicarbonate.
A) calculate amount of 0.1M sucrose solution and amount dH2O needed to prepare 100mL of unbuffered 20mM sucrose.
B)Acetic Acid: calculate amount of each stock solution & amount of dH2O needed for 100mL of acetate buffer that contains 20mM sucrose, 40mM acetic acid, and 60mM sodium acetate.
C) calculate amount of each stock solution & amount dH2O needed to prepare 100mL of a bicarbonate buffer that contains 20mM sucrose, 22mM anhydrous sodium bicarbonate, and 28mM sodium bicarbonate.

2006-09-21 19:53:35 · 1 answers · asked by sball124 3

2006-09-21 18:36:06 · 10 answers · asked by Anonymous

2006-09-21 17:52:00 · 3 answers · asked by Anonymous