Chemistry - September 2007

2007-09-21 07:13:47 · 7 answers · asked by liz 1

2007-09-21 07:06:38 · 14 answers · asked by liz 1

Ca(NO3)2(aq) + H2SO4(aq) ® CaSO4(s) + 2HNO3(aq)

2007-09-21 06:08:56 · 4 answers · asked by PiNk-PrInCeSs 3

Based on the solubility rules, which one of the following compounds should be insoluble in water?
Na2SO4
BaSO4
CuSO4
MgSO4
Rb2SO4

2007-09-21 06:07:12 · 1 answers · asked by PiNk-PrInCeSs 3

All substances are in the gaseous state and, ΔH = –92 kJ.
Predict whether the reactants (left side) or the products (right side) will be favored by the following changes.
i. increased pressure.
ii. increased temperature.
iii. addition of hydrogen .
iv. removal of the product, CH3OH .

2007-09-21 06:00:59 · 3 answers · asked by virgo 1

2007-09-21 04:27:23 · 1 answers · asked by Mike 2

It has been a long time since i took the principles of chemistry and am currently retaking them. i just want to verify.

I am asked:

What ions are present in the compound Mg3N2?

i know that 1 mg contains 2 anions and N contains 3 anions if i am not mistaken. does all this mean that i just multiply the 2 Mg anions by 3 and get 6 anions for Mg and 6 anions for N for a total of 12 anions?

2007-09-21 04:15:13 · 4 answers · asked by john s 3

What are each of these Homogeneous or heterogeneous?
Thanks for your help!!!
Orange Juice
Tap Water
Steel
Air
Raisin Muffins

2007-09-21 04:09:14 · 6 answers · asked by Ray 2

Which of the following statements is/are true concerning orbital overlap bonding, and carbon hybridization.

A. The sp^3 hybrid has one electron "left over" (i.e. not used in the hybrid)

B. The overlap between an electron is a sp^2 hybridized orbital, and an electron in a (s atomic orbital) is called a pi bond.

C. The shape of sp hybridized orbitals dictates 120 degree angkes between bonds

D. In carbon-carbon bonds, the maximum amount of orbital overlap requires that the (p orbitals) are perpendicular to each other.

E. The shape of the sp^3 hydridized orbitals is tetrehedral

F. More than one of the above

G. None of the above

2007-09-21 03:29:41 · 4 answers · asked by Cayden 1

My pet bird might have zinc poisoning (results coming back next week) and until then I want to remove any toys which have zinc in them (some have metal clips for instance). I know some are stainless steel because they're not magnetic, but how do I distinguish between zinc and other metals, without actually destroying the toy? I don't want to have to remove all of his toys because he's so attached to them.

2007-09-20 23:16:23 · 5 answers · asked by Anonymous

Acetaldehyde contains C, H and O in the mass ratio of 6:1:4. Its mass spectrum shows its molecular mass to be 44 amu. what is the molecular formula?

2007-09-20 19:24:45 · 3 answers · asked by Anonymous

2007-09-20 18:38:49 · 6 answers · asked by Anonymous

what is lactic acid? where is it found and how is it use? and how it effects on us?

I need it in simple words so i can understand...not cuz i don't do my hw. I did a research found lots of great stuff but don't understand any.

2007-09-20 18:20:42 · 2 answers · asked by Anonymous

We did a lab on pennies post-1982 and pre-1982.

Pre-1982: contain 95% copper, 5% zinc.
Post-1982: purpose of this lab is to determine this.

We added hydrochloric acid solution. After 1 day, there were bubbles coming out from the notches that we carved in. After 2 days, the pennies turned a little black and the pre-1982 penny was harder than the post-1982 penny.

Questions:
Why did the pennies turn a little black?
What can you conclude about the two different metals and their reactivity with strong acids?
Would this have practical/consumer applications?

By the way, I really don't get this lab. Can someone also explain what's the point of this lab?

2007-09-20 17:35:55 · 8 answers · asked by IN0C3NT 2

2007-09-20 17:24:31 · 1 answers · asked by yodno49 1

need science fair project great award winning complicated detailed I've got about 4 months chemistry energy not involving living things

2007-09-20 16:23:40 · 5 answers · asked by Cinthia W 1

How toxic is diethylene glycol? Is it only harmful when swallowed? Is it safe for such
chemicals to come into contact with cuts or burns on skin?

2007-09-20 16:00:24 · 4 answers · asked by Therese R 2

Lead(ll)nitrate and hydroiodic acid react to produce lead(ll)iodide and nitric acid?
What was the molarity of the lead(II) nitrate solution?
If 3.50g of lead(II) iodide was obtained by adding excess HI to 150 ml of lead(II) nitrate, what was the molarity of the lead(II) nitrate solution?

2007-09-20 15:49:52 · 2 answers · asked by stranger 1

Please! Please!

2007-09-20 14:57:10 · 3 answers · asked by tropicalsarah10 2

2007-09-20 14:30:33 · 2 answers · asked by Anonymous

How many grams are in 250.0 mL of water, can someone help me with this and tell me how you got it?

2007-09-20 14:25:34 · 2 answers · asked by Anonymous

How do the properties of a compound, in general, compare to the properties of the elements that constitute it? Give an example of a common compound and the elements of which it is composed to illustrate your answer.

2007-09-20 14:17:23 · 3 answers · asked by Ryoma Echizen 3

2007-09-20 14:14:19 · 2 answers · asked by iluvunda559 1

If so, can a breastfeeding mother make her baby sick? I was stung by a bee, the area became very swallon and I have not been 100% since, however, my nursing 6month old daughter has been very unsettled since and cant keep anything down. I asked the pharmasist, and they just looked at me like I was stupid... it seems very suspiciously linked... could this be true?

2007-09-20 13:54:59 · 4 answers · asked by MJC 2

Does anyone know part of an atom has the highest density?

2007-09-20 13:54:47 · 10 answers · asked by tkdsl101 2

and how do i know when the atom is stable

2007-09-20 13:37:44 · 2 answers · asked by Anonymous

2007-09-20 12:49:36 · 5 answers · asked by nicelittlestitch626 1

J2me is the Java's software for mobile devices. I need it for my chemistry exam. Please! It's important; very.

2007-09-20 12:01:50 · 1 answers · asked by Anonymous

The volume of 125g of copper.

2007-09-20 11:38:33 · 3 answers · asked by mheg 1

What is the mass of 2.6 x 10^23 molecules of ammonia, NH3?

2007-09-20 11:22:39 · 3 answers · asked by bigoltx 2