Chemistry - December 2006

How would that radiation be produced? Is there more than one method of producing radiation-naturally occuring substances-are these altered or are they in their natural state and what causes them to be produced?

2006-12-04 18:13:17 · 2 answers · asked by Anonymous

It almost faintly glows

2006-12-04 18:09:38 · 3 answers · asked by Anonymous

Ok I have a test tomorrow and there are going to be questions on the test similar to these 3 and I need help working them.

1)Barium can be analyzed by precipitating it as BaSO4 and weighing the precipitate. When a 0.269g sample of a barium compound was treated with excess H2SO4, 0.0891g of BaSO4 formed. What is the % of barium in the compound?

2) How many milligrams of sodium are contained in 3.00g of NaCl?

3)An impure sample of table salt that weighed 0.8421g, when dissolved in water and treated with excess AgNO3, formed 2.044g of AgCl. What is the % of NaCl in the impure sample?

And could you please list steps so I can pull an all-nighter and learn. Thanks

2006-12-04 17:55:09 · 3 answers · asked by bigdog_1269 1

Please list the elements here that are synthetic.If all is synthetic then u do not need to write down all the element names.Hydrogen,helium,lithium,berrylium,boron,carbon,nitrogen, oxygen,fluorine,neon,sodium,magnesium,aluminium,silicon,phosphorus,sulphur.

2006-12-04 17:39:55 · 4 answers · asked by Kenneth Koh 5

I was wondering if amphetamines are an MAOI? Because aren't monoamines serotonin, dopamine and norepinephrine?? and amphetamines release stores of all of those neurotransmitters. So are amphetamines an MAOI?? And what exactly is an MAOI?

2006-12-04 17:24:22 · 2 answers · asked by Chris_55 1

chemistry

2006-12-04 17:06:38 · 4 answers · asked by m_eth_od 1

The question i have to solve is this:

A student prepares a solution by dissolving 4.08 g of NaOH in enough water to make 300. mL of solution.
The student then transfers 34.0 mL of this solution into a 100. mL volumetric flask. Water is then added
up to the 100. mL mark.
What is the final molarity of NaOH in the 100. mL flask ?

okay, so what i did is i calculated the moles in the first solution by dividing the molar mas of NaOH by 4.08 grams (given), then i multiply this by .3 Liters, which gives me a molarity of .0306, then i multiplied this by 34 and divided by a 100 giving me .1. This however is the incorrect answer, can someone please help me. What am i doing wrong?

2006-12-04 16:54:33 · 5 answers · asked by Paul S 2

(2) 0.100 M HC3H5O2 and 0.100 M NaC3H5O2
Calculate the pH after 0.029 mol HCl is added to 1.00 L
please explain in detail. i need a full understanding
thanks

2006-12-04 16:49:48 · 1 answers · asked by tanny 1

I have an old lava lamp from somewhere in the late 60's early 70's. Basicly its old! but still works. Through the years some of the liquid in this lamp has been spilt and I was told that I can fill it up with water. Now I thought they were filled with some kind of oil. When I said this to my friend he then told me that the newer ones do have oil but the older ones from the same time has mine were made different and that they were filled with water.

Is this true?

2006-12-04 16:36:29 · 2 answers · asked by nc_d_dub 2

thnx ahead of time lol

2006-12-04 16:34:43 · 4 answers · asked by Pearl 2

Which of the following statements are true for the reaction


Ca(OH)2(aq) + HCl(aq) -->




a) CaCl2(aq) is a product

b) When balanced the coefficient of HCl(aq) is 3

c) Ions cannot appear in the net ionic equation because they always cancel out on both sides of the equation

d) H+(aq) appears in the net ionic equation

e) Cl -(aq) appears in the net ionic equation



Examples of species are (aq) (s) (l) etc.

2006-12-04 16:02:14 · 1 answers · asked by greg s 1

2006-12-04 16:01:42 · 5 answers · asked by asking 1

Like i really need help on how to do dis.. so could u plz explain it real good.. thankz if u do..

2006-12-04 15:47:48 · 1 answers · asked by Paul Walker 2

1. Why is ther a large jump in ionization energy between the second and third ionization energies for magnesium?

2. Explain why noble gases are inert and do not form ions?

thanks!

2006-12-04 15:38:18 · 5 answers · asked by wat8besha 1

i really, REALLY need help on a project that is due 2morrow @ skool,(dec. 5th, 2006...),i need as much info as i can get on Dmitri Mendeleev for an biography that im duin for my chem. class....
plz help!!!

2006-12-04 15:24:00 · 3 answers · asked by el spider-man-dude 2

a) NH4+


b) HSO4


c) H2PO4−


d) HNO3

2006-12-04 15:23:15 · 3 answers · asked by Anonymous

a) H2PO4− < HNO3 < NH4+ < HSO4


b) HNO3 < HSO4 < H2PO4− < NH4+


c) NH4+ < H2PO4− < HSO4 < HNO3


d) HSO4 < NH4+ < H2PO4− < HNO3

2006-12-04 15:22:24 · 3 answers · asked by Anonymous

i just want to know... for a science test.... tell me PLEASE!

2006-12-04 15:11:00 · 4 answers · asked by Anonymous

assuming same temperature and pressure

2006-12-04 15:01:19 · 3 answers · asked by JC 1

2006-12-04 14:55:12 · 5 answers · asked by motochic15_95023 1

thank you for anwering if you do

2006-12-04 14:54:34 · 5 answers · asked by Anonymous

calcium oxide + water


silver chloride decomposes to?

iron(3) carbonate decomposes to ?


sliver plus phosphoric acid (singe replacement)

2006-12-04 14:42:17 · 1 answers · asked by Anonymous

Formation of a gas during a chemical reaction is a common sign of what type of reaction?

2006-12-04 14:38:24 · 2 answers · asked by nglennie_06 1

H3PO4 + Ca(OH)2 - >

2006-12-04 14:37:02 · 2 answers · asked by Anonymous

Calculate the freezing point of watercaused by dissolving 3.8m of CaCl2 (Kf=1.0 Degrees C/m). Would this be sufficient to prevent ice from forming on the sidewalk?

2006-12-04 14:32:19 · 1 answers · asked by Anonymous

need this for a test.

2006-12-04 14:29:02 · 4 answers · asked by Anonymous

Doing a test and need this info to finish the question.

2006-12-04 14:19:01 · 1 answers · asked by Anonymous

2006-12-04 14:18:27 · 3 answers · asked by Anonymous

What is the value for the molar enthalpy of decompostion for H2O2? Thanks for the Help!!!

2006-12-04 14:15:33 · 2 answers · asked by nglennie_06 1

2006-12-04 14:05:57 · 1 answers · asked by Megan D 1