Chemistry - April 2007

2007-04-21 06:23:19 · 5 answers · asked by moop 1

Which of the following solutions would have the lower freezing temperature 0.1m NaCl or a 0.1m CaCl2? Explain your answer.

2007-04-21 05:55:14 · 3 answers · asked by Anonymous

For a science project we are not allowed to use real acid because it is too dangerous. Do you know any substitutes for real hydrchloric acid?

2007-04-21 05:55:12 · 7 answers · asked by Anonymous

Also, is one of these forms of magnesium utilized by the body any better than the other?

2007-04-21 05:42:29 · 3 answers · asked by justme 1

How are metals protected from oxidizing?

2007-04-21 05:36:29 · 2 answers · asked by curiouschem 1

2007-04-21 05:35:34 · 2 answers · asked by Lily 1

2007-04-21 05:19:13 · 2 answers · asked by boss 1

Determine the concentration of magnesium ions, [Mg 2+], when solid MgF 2 (K sp = 4.780x10^-9) is added to a 8.34x10^-2 M NaF( aq) solution.

Can anyone help me with this? I posted this question yesterday and no one has been able to help yet.. I am really lost.

2007-04-21 04:40:43 · 4 answers · asked by Anonymous

There are how many type of photoinitiator
that suitable for making printing ink and overprint varnish.Its classification and its usage

2007-04-21 04:28:28 · 1 answers · asked by alice shahalam 1

Find the dot and cross diagrams of the following:
SF2 (sulpur and fluorine)
CHCl3 (carbon, hydrogen and chlorine)
PBr5 (phosphuros and bromine)
SF4 (sulphur and fluorine)
ICl5 (iodine and chlorine)
XeF4 (Xenon and fluorine)

Find the molecular shapes of the following
H2CO (hydrogen, carbon and oxygen)
SF2 (sulphur and fluorine)
CHCl3 (carbon, hydrogen and chlorine)
ClF3 (chlorine, fluorine)
ICl5 (iodine, chlorine)
XeF4 (xenon, fluorine)

2007-04-21 04:14:47 · 2 answers · asked by Anonymous

2007-04-21 03:50:54 · 1 answers · asked by Sahaya S 1

I love the smell of gasoline,starter fluid and metalic contour pens that contain xylene and other chemicals which could be harmful or fatal if swallowed,so why don't "they" make perfume with these substances in them so "we" don't accidently consume them?

2007-04-21 03:38:41 · 4 answers · asked by donelle g. 7

1. a lever is used to lift a 45 N rock. the applied force is 75 N.
2. a pulley system raises a 39 N log with an applied force of 45 N.
3. you do 425 J of work to push a 75 N box up a ramp until the box is 2.5 m above the ground

2007-04-21 03:02:31 · 2 answers · asked by Anonymous

2007-04-21 02:39:41 · 1 answers · asked by SG 1

Method:You add the base/carbonate/metal to the acid until no more will dissolve and you have some base left over (called an excess). You filter the mixture to remove the excess base then evaporate the water in the filtrate to leave the salt behind.

2007-04-21 02:31:36 · 2 answers · asked by Anonymous

It will be greatly appreciated if you prescribe a good site covering this area (catalyst and chemistry).
Thx in advance. :-)

2007-04-21 01:37:11 · 1 answers · asked by Anonymous

I WANT IT NOW PLZ

2007-04-21 00:49:23 · 1 answers · asked by Anonymous

amphotericin B formulation

2007-04-20 23:38:07 · 1 answers · asked by innocent_satya2006 1

i added red phospherous (match heads) tomato dust (sulfur & copper oxalate , or sumthing) and activated carbon, and i grinded it up ind it burned yellow and purple, what is a good ratio and why did it burn tht colour, not sure because copper burns bluei green

2007-04-20 23:00:11 · 1 answers · asked by Me + Me = BANG! 2

Reaction mixtures of the following systems are prepared and allowed to come to equilibrium. Which (if any) of the systems will shift their equilibrium towards more products when the total pressure in the container is increased by decreasing the volume?
A) CO2(g) + H2(g) ⇔ H2O(l) + CO(g)
B) 2CO(g) + O2(g) ⇔ 2CO2(g)
C) 2NO(g) ⇔ N2(g) + O2(g)
D) N2O4(g) ⇔ 2NO2(g)
E) Ni(s) + 4CO(g) ⇔ Ni(CO)4(g)
F) 2C(s) + O2(g) ⇔ 2CO(g)

2007-04-20 20:21:49 · 3 answers · asked by bollocks 2

Pl give even the isomers for C4H7Br & their IUPAC names &identify the chiral molecules?

2007-04-20 19:59:14 · 4 answers · asked by soma 2

PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!

2007-04-20 19:56:35 · 2 answers · asked by soma 2

Is it linear? the higher the temperature the higher diffusion rate (all other conditions are same). Imagine putting the same sample under different temperatures and comparing the diffusion.. Is the graph going to be curving? why? please explain with details, maybe an explained formula as well? Thank you!

2007-04-20 19:43:04 · 2 answers · asked by Leo L 2

C2H5OH sorry the numbers cannot be small... The second part is actually to give another example of an equation carbon dioxide as a by-product

2007-04-20 19:23:56 · 4 answers · asked by Anonymous

When calcium is heated, a orange spectral line whose energy is 3.26 10-19 J per photon is produced.

(a) What is the frequency of this light?

(b) What is the wavelength of this light?

2007-04-20 19:22:58 · 3 answers · asked by sydney 1

An HNO3 solution has a pH of 3.47. What volume of 0.015 M LiOH will be required to titrate 65.0 mL of the HNO3 solution to reach the equivalence point?

2007-04-20 19:20:33 · 3 answers · asked by sydney 1

how to reduce water content in a chemical, says, initially 3% water content reduce to 0.1%.

if you suggest vaccum the container, please tell me why vacuum would reduce the water content?

2007-04-20 18:54:17 · 8 answers · asked by wyeechen 2

2007-04-20 18:48:04 · 2 answers · asked by sweety 2

websites using chemistry

2007-04-20 18:45:55 · 6 answers · asked by cridernet_55 1

When 1 mol of gaseous HI is sealed in a 1.00-L flask at 225oC, it decomposes until the
equilibrium amount of I2 present is 0.182 mol:
2HI(g) ⇔ H2(g) + I2(g)
Use these data to calculate Keq for this reaction at 225oC.

2007-04-20 18:40:52 · 2 answers · asked by bollocks 2