Chemistry - May 2007

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"Ideas From Mad Scientist Diary"

Does anyone know which chemical is opposite(or nearly) to Liquid Nitrogen in terms of thermal behaviour?

or if somebody knows some chemical liquid/semi-liquid which has normal temperature around (80-100)+ degree centigrade, not poisonous or obnoxious - should be able to handled like LN2 using sealed containers and some precautions - above all the prices shall be in Mate's rate category?

I wish to use it like Liquid Nitrogen, instead the application is heating system.

http://en.wikipedia.org/wiki/Liquid_nitrogen#Liquid_nitrogen

(P.S: Im totally blank in chemistry!!!!)

2007-05-28 03:26:44 · 5 answers · asked by Anonymous

I learned that the Sharp air purifiers' HEPA filters have an Apatite component to it that apparently provides antibacterial properties to protect the filters from microbial accumulation. Is Apatite a relatively "safe" material to use for an air filter, i.e. is it safe for the resident who is breathing air that comes through the filter? Apatite (a very general term) is usually made up of phosphorus and calcium, but some variants (ie. arsenates like mimemite) may contain arsenic. Could this be a health issue for users? Would the filters use arsenic-based variants in the first place, or are other forms more prevalent and likely to be used in medical/industrial applications?

2007-05-28 03:07:33 · 1 answers · asked by Roger L 1

oil water mixture,is it hetrogenous ?if so why?

2007-05-28 02:50:58 · 5 answers · asked by Maya 1

How do you best explain what ionic bonding is?

2007-05-28 02:35:34 · 1 answers · asked by gusomar 3

A freshman chemistry student decides to examine the soda fountain methods of making carbonated beverages by measuring the amount of acid in a fixed volume Coca-Cola. He/she decides that he/she will use a 250 ml sample for all of his/her analyses and that he/she will make each batch with a separate CO2 cylinder so that carbon dioxide content in each batch would be as uniform as possible. In a typical experiment, the student saturates the Coke solution with the CO2 in the cylinder. He/she titrates the 250 ml sample to phenolphthalein endpoint with 7.65 ml of a sodium hydroxide solution that contains 5.670 grams of sodium hydroxide per liter. How much carbon dioxide was in the saturated solution?

2007-05-28 02:18:00 · 2 answers · asked by Anonymous

A freshman chemistry student decides to examine the soda fountain methods of making carbonated beverages by measuring the amount of acid in a fixed volume Coca-Cola. He/she decides that he/she will use a 250 ml sample for all of his/her analyses and that he/she will make each batch with a separate CO2 cylinder so that carbon dioxide content in each batch would be as uniform as possible. In a typical experiment, the student saturates the Coke solution with the CO2 in the cylinder. He/she titrates the 250 ml sample to phenolphthalein endpoint with 7.65 ml of a sodium hydroxide solution that contains 5.670 grams of sodium hydroxide per liter. How much carbon dioxide was in the saturated solution?

2007-05-28 02:16:51 · 1 answers · asked by Anonymous

to answer this firlst find whats alchemy??

2007-05-28 01:59:54 · 5 answers · asked by anna 2

2007-05-28 01:31:04 · 1 answers · asked by kinana m 1

What is meant by a carbon footprint, plase help need to know for my gcse exam

2007-05-28 01:06:19 · 5 answers · asked by Nick 3

2007-05-28 00:35:30 · 6 answers · asked by M.Somu s 1

hi, ive got 3 questions and would appreciate anyone answering...
1)how do the electron configurations of the different transition metals explain their location in the periodic table?

2) why do transition metals form complex compounds?

3)what property of transition metals makes some of them able to act as effective catalysts?

thanks to anyone who can help in advance... :)

2007-05-27 23:07:23 · 3 answers · asked by wardat_alarab 1

What is the chemical equation for this experiment?

The experiment is to find the amount of Nitrogen in fertiliser.

Firstly you dissolve 10g of the fertiliser into some distilled water, add sodium hydroxide and then titrate the solution with hydrochloric acid [all chemicals are of known concentrations]. And then note how much HCl was used.

So, the things that are important are:
Sodium Hydroxide [NaOH],
Hydrochloric Acid [HCl], and
the fertiliser

I’ve done the whole experiment I just need the chemical equation. I would really appreciate any help with this, thanks.

ps- the equation wasn't with the experiment

2007-05-27 23:00:36 · 1 answers · asked by ash 2

pwz help meh

2007-05-27 22:46:26 · 4 answers · asked by ping 1

i would like to know the definition of the element metal?

2007-05-27 21:41:55 · 5 answers · asked by Anonymous

pwz help?

2007-05-27 21:39:19 · 4 answers · asked by ping 1

please state whether the following substances are metals, nonmetals or metalloids..
Iodine
Gold
sillicon
chlorine
selenium
silver
boron
chromium
nickel
argon
neon
bromine

2007-05-27 21:07:08 · 6 answers · asked by Vipul C 3

Does aniline dissolve in water or not? and if it does then does it happen instantly and completely or is it slow / partial.

2007-05-27 21:04:00 · 1 answers · asked by B 1

here are two questions of odd man out.
please correctly make the odd man out and state why..
Q.1. sugar, salt, gun powder, iron sulphide

Q.2. sodium, antimony, silver, platinum


ok.. plz answer

2007-05-27 21:03:06 · 4 answers · asked by Vipul C 3

Sulfuryl chloride, SO2Cl2, decomposes to SO2 and Cl2 at 648K with a Kc=0.045 by the following reaction:
SO2Cl2(g) « SO2(g) + Cl2(g)

You place 16.0 grams of SO2Cl2 into a 5.5 liter flask and heat the flask to 648K. What is the equilibrium concentration of SO2 in the flask? Enter your answer in scientific notation.
Answer:

You now carry out the reaction described above in a 1.00 liter flask. You begin with 18.5 grams of SO2Cl2 and include enough Cl2 gas to give a partial pressure of 1.2 atm at 648 K. What is the initial concentration of chlorine gas in this flask in moles/liter?
Answer:

Using the data from the preceeding question, determine the equilibrium concentration of SO2 in the 1.00 liter flask at 648 K. Enter your answer in scientific notation.
Answer:

2007-05-27 20:35:11 · 1 answers · asked by Bruce 1

Ammonium carbamate N2H6CO2, a salt found in the blood and urine of of mammals, sublimes completely at 70oC. It dissociates into NH3 and CO2 according to the equilibrium process below.
N2H6CO2(s) « CO2(g) + 2NH3(g)

At lower temperatures, it dissociates only partially. A sample of N2H6CO2 is heated to 30.0oC and allowed to reach equilibrium. An examination of the system reveals that the total pressure of the gases is 0.155 atm. Calculate the Kp for this equilibrium

2007-05-27 20:26:52 · 1 answers · asked by Bruce 1

2007-05-27 20:22:50 · 2 answers · asked by Anonymous

2007-05-27 20:21:08 · 2 answers · asked by Anonymous

1. lactose
2. sucrose
3. fructose
4. raffinose

2007-05-27 17:33:54 · 13 answers · asked by Anonymous

2007-05-27 17:22:16 · 1 answers · asked by Anonymous

2007-05-27 17:19:23 · 1 answers · asked by Anonymous

Can someone give me two examples of households liquids that demonstrate the law of multiple proportions? thanks

2007-05-27 17:05:15 · 1 answers · asked by jm103882000 2

The Law of DuLong and Petit states that the heat ocapacity of many metals is approximately 6.0calories per mole-degree C. Knowing that the specific heat capacity of three metals in Joules per gram-C is 0.45 for Fe, 0.24 for Ag, and 0.13 for Au. Do these metals agree with the Law of DuLong and Petit? How do you know this? Using your understanding of bonding in metals, explain why this law appears to hold.

2007-05-27 17:05:11 · 2 answers · asked by love2nnelly 1

I need to know its solute and its solvent of the solid solution.

2007-05-27 16:50:51 · 1 answers · asked by leli_0920 1

Aluminum metal melts at 660 degrees Celsius and boils at 24550 degrees Celsius. It's density is 2.70grams/cc. Calculate the following:
A. Assuming an ideal gas, the volume occupied by 20.0 kilograms of aluminum vapor at its boiling point and under a pressure of 2280 torr.
B. The volume occupied by 1000 kilograms of the metal at 25 degrees Celsius
C. If the specific heat capacity of aluminum metal is 0.89 Joules per gram-degree C, how many calories of energy are required to 10 kilomoles of aluminum from 250 degree Celsius to 500 degree Celsius?
D. If 13.5 grams of aluminum were dissolved in an excess of concentrated HCl, what volume of hydrogen gas would be released at STP? You may assume that the ideal gas law holds and that the vapor pressure of water is negligible compared to the pressure of the released hydrogen.

2007-05-27 16:36:24 · 2 answers · asked by love2nnelly 1

In the reaction barium chloride + potassium chromate yields potassium chloride?
and barium chromate, 100grams of barium chloride is mixed with 1050 grams of water to make a barium chloride solution, which has a volume of exactly 1000ml. It is titrated with a solution of 100. grams of potassium chromate dissolved in sufficient water ot make exactly 5000ml of solution.
Calculate the following:

A. The mass percent of the barium chloride

B. the molarity of the potassium chromate solution

C. The volume of potassium chromate solution required to react with all the barium chloride solution.

D. If 200. grams of barium chloride were dissolved in sufficient water to make 2 liters, how many grams of potassium chromate would be required to react completely with all the barium chloride

2007-05-27 16:22:00 · 1 answers · asked by love2nnelly 1