Chemistry - November 2007

An AM station broadcasts rock music at 923 on your radio dial." Units for AM frequencies are given in kilohertz (kHz). Find the wavelength of these radio waves in meters (m), nanometers (nm), and angstroms

2007-11-05 02:18:45 · 3 answers · asked by Anonymous

thanks

2007-11-05 02:17:11 · 2 answers · asked by ruhail774 2

Q) The reaction, fructose - 6-phosphate + Pi -----> fructose - 1,6-bisphosphate + H2O,
has a Keq of 0.0001 at pH 7. What is the deltaG for this reaction?

2007-11-05 02:06:56 · 1 answers · asked by great 2

I'm looking for a formula to calculate pressure in a closed vial, if I heat 5ml of DI water at 160°C, what will be the pressure in it? Will it be stable if I keep de temperature stable for long periode time?

Thank you everyone

2007-11-05 02:00:58 · 2 answers · asked by Soulnette 1

2007-11-05 01:34:45 · 1 answers · asked by IbeME 1

2007-11-05 01:30:20 · 1 answers · asked by Anonymous

2007-11-05 01:13:05 · 2 answers · asked by Anonymous

when 2-methyl-2-butanol is dehydrated using sulfuric acid it forms 2-methyl-1-butene and 2-methyl-2-butene. Based on how many protons can be abstracted, the ratio should be 1:3 but i actually calculated it to be about 1:7, why is that?

2007-11-05 01:03:32 · 2 answers · asked by ? 4

volume ratio please, how thich would be the slurry thing over the slide be?
is it preferable to have the coating thick or thin?

2007-11-05 00:58:56 · 1 answers · asked by oozed neon 2

Heya. I am doing my chemistry coursework on the reaction between potassium permangate and oxalic acid - and i am looking at the difference that changing the concentrations of the oxalate ions and manganate (vii) ions will have to the reaction, and also changing the temperature of the reaction, and the catalysts in the reaction. I have found out that it is a autocatalytic reaction, but i dont know what the catalyst is? is it the carbon dioxide or not? please can someone help me becuase i am going out of my mind with worry!!

what concentrations do i need to try for the oxalate and the pott perm? and what temperature range should i use - and how do i change the temperature(seeing as i am doing a titration?!)

thankyou so much guys..

Sami xoxox

p.s. i also need to be able to work out the rate of reaction using a calibration curve.. if anyone wants to be so kind as to help me.. drop me a message!

2007-11-05 00:46:00 · 2 answers · asked by toptoxgal 2

Can (SO4)2 be alone as a reactant like below:

Al3 + 3 NH4 + 3 (SO4)2 = 3 AlNH4(SO4)2

I would greatly appreciate any help.

2007-11-05 00:21:29 · 1 answers · asked by ibd_profits 1

The following reaction is carried out on an industrial scale for the production of thionyl chloride, a chemical used in the manufacture of pesticides.
SO3(g) + SCl2(l) OSCl2(l) + SO2(g)

The thermodynamic data listed below are for 298 K. Determine the temperature at which Keq = 1.0 10^15 for the reaction.

delta Hf(kJ/mol): .....S, J/mol*K
SCl2(l): -50.......150
OSCl2(l): -250 ....120

2007-11-04 23:56:51 · 1 answers · asked by sccrkidd8687 1

I'm just wondering if you need other degrees

2007-11-04 23:56:27 · 4 answers · asked by Anonymous

giving a scientific explanation

2007-11-04 23:41:21 · 2 answers · asked by thirdigras 2

The neutral organic compound I am given is dissolved in 50mL of methelyene chloride and it is contaminated with 5% of an organic acid AND/OR 5% of an organic base. I have to separate the neutral compound from the base and or acid impurities and obtain a maximum yield of purified material.

Thanks in advance for the help.

2007-11-04 16:38:30 · 2 answers · asked by swizzbeatz905 1

2007-11-04 15:54:21 · 6 answers · asked by jagabattuni 1

calculate the mass of excess reagent remaining at the end of the reaction in which 90.0g of SO2 are mixed with 100.0g of O2.
SO2+O2--> SO3

can someone help me with this, i am kind of stuck, also can you show me how you got your answer, so i can see where i went wrong.

2007-11-04 15:19:18 · 2 answers · asked by aminer_lover90 1

Use data from Table 7.2 to calculate the volume of butane, C4H10(g), measured at 20.1°C and 753 mmHg, that must be burned to liberate 4.95 104 kJ of heat.

delta Hf of C4H10 = -125.6 kJ/mol

2007-11-04 15:14:48 · 2 answers · asked by toocool 1

a) hydrogen-2 and hydrogen-3 combine to form a helium-4 atom and a neutron.
b) carbon-12 and hydrogen-1 combine to form a nitrogen-13 atom.
c) uranium-235 absorbs a neuten and splits into barium-141, krypton-92, and three neutrons.
d) a glucose molecule is metabolized with oxygen into carben dioxide and water

2007-11-04 15:06:22 · 2 answers · asked by Anonymous

2007-11-04 14:39:06 · 1 answers · asked by Greg P 1

Consider the dissolution of CaCl2:

CaCl2 -> Ca+2 + 2Cl- Delta H= -81.5 kj

An 11.0 g sample of CaCl2 is dissolved in 125g of water, with both substances at 25.0 degress celcius. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the solution has a specific heat of 4.18 J/g * C.

2007-11-04 14:26:16 · 1 answers · asked by jotham4200 1

2007-11-04 14:22:06 · 6 answers · asked by Anonymous

2007-11-04 14:17:40 · 5 answers · asked by chaniquana 1

and how do you balance this one?

Sn + KOH ----> K(2)SnO(2) + H(2)

This (2) means that the two is on the bottom of th element

thanks?!

2007-11-04 14:13:32 · 2 answers · asked by Alessandra 2

like any other kind of good explosive
thanks :)

2007-11-04 14:07:04 · 2 answers · asked by rightt onn 1

2007-11-04 14:06:37 · 2 answers · asked by Cassandra C 1

The equilibrium constant (Kc) for the reaction
2HCl(g)<===>H2(g) + Cl2(g)
is 4.17x10^-34 at 25 C. What is the equilibrium constant for the reaction
H2(g) + Cl2(g) <===> 2HCl(g)
at the same temperature?

2007-11-04 13:32:25 · 4 answers · asked by ~b0wL_aDDiCt~ 2

A hydrocarbon was analyzed to be 5.7 mass percent hydrogen and 14.3 mass percent hydrogen. At 26 degrees Celcius and 75 torr pressure a sample with a volume of 1.13 L had a mass of 1.904 grams. Determine the molecular formula.

2007-11-04 13:09:19 · 2 answers · asked by Dan S 1

So as my teachers and I have discussed mass and energy are very intertwined, and often they cannot be separated. I.E. bullet goes through a wall b/c of its energy, but without the bullet to carry the energy nothing would happen. So, that being said, how does and enzyme reduce the necessary activation energy without losing some of its original mass?

Thanks much.

2007-11-04 13:07:09 · 2 answers · asked by matthew s 2

is the answer 179? if not, then please tell me how to get the correct answer.

2007-11-04 12:54:38 · 4 answers · asked by Anonymous