Chemistry - August 2007

he mass of a length silver chain is 1.05g/cm . Convert this density to kg/m .

2007-08-10 12:45:44 · 3 answers · asked by Anonymous

Molar Mass is 74.6 grams

2007-08-10 10:49:56 · 4 answers · asked by chato r 1

2007-08-10 10:47:21 · 6 answers · asked by Rachel T 1

E.g. chiral, etc.

2007-08-10 10:34:44 · 2 answers · asked by Anonymous

a. 25ml graduated cylinder
b. 25ml Pipette
c. 50ml burret
d. 50ml beaker

2007-08-10 10:25:47 · 5 answers · asked by chato r 1

2007-08-10 10:24:57 · 5 answers · asked by Anonymous

2007-08-10 05:04:41 · 6 answers · asked by Rudresh c 2

Does carbon has an antibacterial effect in bacteria?? Especially in Staphyloccocus aureus??

Please help me...

Thanks...

2007-08-10 02:48:11 · 7 answers · asked by Rowelto Jr. 1

The long tubes, the halo shaped, and the compact bulbs that wind around several times... how do they compare in their towic properties?

Is one kind more dangerous to break than another kind?

If so, which are worse &/or 'safer'?

What is the recommended proceedure when one breaks?

Ditto ^ , if it has already been put out in the trash, when you find out about it?

Links to the best Web sites with such info will be appreciated, as will the sharing of expert personal knowledge.

2007-08-10 02:34:49 · 2 answers · asked by Anonymous

pls.help me...i really nid to know it thanks!!?

2007-08-10 02:32:15 · 6 answers · asked by louie 2

What do i need to add to this water? This water is being used to anodize titanium.

2007-08-10 02:30:45 · 10 answers · asked by terminator2k4 1

Answer by giving an example

2007-08-10 02:18:25 · 2 answers · asked by DR DIM-G 1

25cm3 of a solution of X2O5 of concentration 0.100M is reduced by SO2 to a lower oxidation state.To reoxidise X to its original oxidation number requires 50cm3 of 0.02M KMnO4 solution.To what oxidation number was X reduced by SO2?

2007-08-10 02:15:49 · 2 answers · asked by Anonymous

Anyone?

Thanks in advance.

2007-08-10 02:02:39 · 10 answers · asked by Anonymous

Calculate H for the following reaction,

CaO(s) + CO2(g) --> CaCO3(s)

given the thermochemical equations below.

2 Ca(s) + O2(g) --> 2 CaO(s) H = -1270.2 kJ
C(s) + O2(g) --> CO2(g) H = -393.5 kJ
2 Ca(s) + 2 C(s) + 3 O2(g) -->2 CaCO3(s) H = -2413.8 kJ

a. -4077.3 kJ
b. -750.1 kJ
c. -178.3 kJ
d. +350.2 kJ
e. +2870.6 kJ



How do you solve??

2007-08-10 01:48:49 · 3 answers · asked by Anonymous

2007-08-10 01:14:44 · 4 answers · asked by ? 6

given in a table that a noble gas has peaks at followin m/e values....
m/e=10 relative intensity = 2.0
m/e=11 relative intensity =0.2
m/e= 20 relative intensity =17.8
m/e=22 relative intensity = 1.7

the species is Ne..but the questions ask for the symbol for each species for each m/e value...as i knoe the mass of Ne is 20.0g..why is there the m/e=10 and 11 there??

2007-08-10 00:43:11 · 1 answers · asked by b_nice_c88 1

Given question calculate the mass of 1 mol H+ ions.The mass of single electron is 9.1091x 10^-28.Given Avogadro's contant is 6.0225x10^23...Ar of H=1.0078g..

sltn given is by using equation of H -> H+ + e..
1.0078g - (6.0225+10^23)(9.1091 x 10^-28)
= 1.0073g..
my question is WHY the mass of electron has to be multiplied with avogadro's constant while the Ar of H need not to be multiplied with avogadro's constant?..

2007-08-10 00:39:14 · 1 answers · asked by b_nice_c88 1

when put together? like maybe CO3 and NaOH? Please provide the chemical sentence. Also, how can you test whether the nature of a liquid is alkaline? Any experiments? thank u

2007-08-09 23:29:16 · 2 answers · asked by Lady Fish 3

2007-08-09 22:23:02 · 5 answers · asked by Rawwr* 3

C.PROPERTIES
1.Uncork one test tube of oxygen and then insert a glowing splint. Observe.
2.Place a small amount of sulfur in the deflagrating spoon. Ignite the sulfur and immediately tilt it into a test tube of oxygen. Take note of the odor of the gas produced and add 5mL of water into the test tube.Shake and test the solution with blue and red litmus paper.Observe.
2.Ignite one end of a strip of magnesium ribbon and immediately drop it into a test tube of oxygen. Cool the tube and add 5mL of water shake the mixture thoroughly and test with litmus paper. Observe.

Questions:
1.Describe the physical properties of oxygen.
2.(For procedure no.1 of PROPERTIES)
Does the splinter continue burning in the tube? Why?
What can you say about the relative density of oxygen?
3.(For procedure no.2 of PROPERTIES)
What was formed when sulfur was heated?
What is the equation?
What solution is formed after adding H20(water)?
What is the equation?
(next questions to the next post...)

2007-08-09 21:49:27 · 4 answers · asked by jmar 1

2007-08-09 20:48:54 · 6 answers · asked by jiexinneo 1

Explain how a mass spectrometer is used to determine the relative abundance of an isotope.

2007-08-09 20:04:13 · 4 answers · asked by Bballplayer 1

What does the term hydration mean? Explain the energy involved including the terms hydration energy and lattice energy.

2007-08-09 20:03:40 · 1 answers · asked by Bballplayer 1

How do you balance a redox equation in the "basic state"?

2007-08-09 20:02:40 · 1 answers · asked by Bballplayer 1

I am trying to find a mechanism for the formation of an azomethine ylid from an amino acid with the general formula R-NH-CH2-CO2H and an aldehyde like formaldehyde or acetaldehyde.

2007-08-09 19:59:28 · 3 answers · asked by gordonliu 2

....and how can you tell if your glasses lens is plastic or glass?

2007-08-09 18:05:17 · 5 answers · asked by smiles 2

i'm involved in a project, now i need a powerfull batteries like lithium ion or nickel metal hydride, maybe powerful. but i only will use li-ion battery or nimh battery as a last resolve. any idea what is more powerful chemical solution/compund that could be more powerful, like able to power a small motor to that support human weight around 70kg and move faster than 30 km per hour?

2007-08-09 16:40:48 · 2 answers · asked by Anonymous

2007-08-09 16:25:17 · 5 answers · asked by hii 1

A sample of a vegetable dye scraped from a cave painting was converted to CO2 for C-14 determination. The radioactivity of the CO2 was measured as 3.76 counts per minute per gram of carbon( c.p.m). The C-14 in a living organism has 15.3 c.p.m. and the half-life of C-14 is 5760 yr. How old is the painting in years? (Answer to 3 significant figures and use e notation for power of 10, e.g. 1.23e2 for 1.23 x 102)

2007-08-09 16:13:40 · 2 answers · asked by Anonymous