Chemistry - May 2007

Why does the reaction of 1-bromobutane needs to be acidified before addition of the silver nitrate (AgNO3)? Its confusing! i need help!

2007-05-11 15:15:31 · 2 answers · asked by Arwen E 1

Coal is converted into cleaner more transportable fuels by burning it with oxygen to produce carbon monoxide.
The carbon monoxide then is reacted with hydrogen using a catalyst to produce methane and water. Is the reaction
between CO and H2 exothermic or endothermic, and what is the change in enthalpy for it? The enthalpies of
formation of the reatants and products are given below.
Molecule Ho
f in kJ/mol
CO - 110
H2 0
CH4 - 75
H2O - 242
A) exothermic, + 317 kJ/mol
B) endothermic, + 207 kJ/mol
C) exothermic, - 427 kJ/mol
D) endothermic, + 427 kJ/mol
E) exothermic, - 207 kJ/mol

please explain answer

2007-05-11 14:38:41 · 1 answers · asked by lenny b 1

2007-05-11 14:36:09 · 5 answers · asked by GuGuEyes 1

just want to ask

2007-05-11 14:33:49 · 4 answers · asked by evangelina s 1

i know its a psychedilc drug but like what form does it come in? is it pills, powder, shots or what? this is for a history project, thanks!

2007-05-11 14:07:33 · 4 answers · asked by vicky j 2

a package of compounds used to achieve rehydration in sick patients contains 21.0 g of glucose, C6H12O6. When this material is diluted to 1.18 L, what is the molarity of glucose?

2007-05-11 12:49:53 · 2 answers · asked by serene 1

If 73.8 mL of an AgNO3 solution reacts with enough Cu to produce 0.241 g Ag by single displacement, what is the molarity of the initial AgNO3 solution if Cu(NO3)2 is the other product?

2007-05-11 12:48:55 · 1 answers · asked by serene 1

Most community water supplies have 0.5 ppm of chlorine added for purification. What mass of chlorine must be added to 132.0 L of water to achieve this level?

2007-05-11 12:47:24 · 4 answers · asked by serene 1

2007-05-11 12:32:20 · 1 answers · asked by ima p 1

2007-05-11 10:43:38 · 3 answers · asked by Anonymous

2007-05-11 08:52:39 · 2 answers · asked by HD 1

I know you can do this, since its chemical base is weaker than chlorine, but how much? It is 66 in by 14 in, so how much is safe? How many tablespoons or cups do you put in for that little pool? thanks in advance!

2007-05-11 08:40:13 · 3 answers · asked by ? 1

2007-05-11 07:35:48 · 4 answers · asked by Jerry P 6

2007-05-11 07:32:20 · 3 answers · asked by Anonymous

Please help.

2007-05-11 07:27:29 · 3 answers · asked by Anonymous

2007-05-11 07:20:37 · 4 answers · asked by Anonymous

2007-05-11 07:08:33 · 3 answers · asked by giant_stars 1

a) Ca2+ to Ca
b) 2I- to I2
c) 4OH- to 2H2O + O2
d) H2S to S + 2H+

2007-05-11 06:31:31 · 3 answers · asked by Anonymous

Just for a check i want conformation on each reaction is there oxidation or reduction occuring, state with a reason please.
1) Zn to Zn 2+ (This is a ion)
2) Mn2+ to MnO4 - (the 4 is the number of oxygens and - is the charge)
3) CO to CO2
4) CrO4 2- to Cr2O7 2- (the 4 and 7 are the number of oxygnes and the 2- is the charge)
5) NO2 to N2O4

Thanks

2007-05-11 06:27:42 · 5 answers · asked by Anonymous

ok so this is an explanation one....
i kinda get it but i think im getting the wrong points

Ok heres the qUESTION:

Explain to your friend why it would not be good to throw a can of aerosol into the campfire. Name the gas law this uses and write your explanation in complete articulate sentences.

Ok my answer
because it the can of aerosol's molecules will increase their speed causing the can to explode into the fire and causing a bigger explosion. Using Boyles law???

pLEASE HELP!!! thanks a lot

2007-05-11 03:56:08 · 2 answers · asked by Mandi M 1

I am planning on doing a double major in
Biology(B&MB) and Chemistry. Since there are overlapping isn't possible to minor like in Spanish? what's your opinion?

2007-05-11 03:52:10 · 4 answers · asked by avalentin911 2

2007-05-11 03:49:56 · 4 answers · asked by justcallmejayboi 1

A gas occupies 11.2L at 0.860atm . What is the pressure if the volume becomes 150L?
please show work and gas law used
i got 0.064atms but i think it is wrong...

2007-05-11 03:47:05 · 3 answers · asked by Riley 1

A sample of gas occupies 1.55 L at 27oC and 1.00 atm pressure. What will the volume be if the pressure is increased to 50.0 atm, but the temperature is kept constant?

2007-05-11 03:25:33 · 4 answers · asked by j_3_s_5 1

2007-05-11 03:11:04 · 2 answers · asked by justcallmejayboi 1

I'm was wondering which type of clear plastic is the best sound insulator for the price. I'm aiming to spend about $2-3sqft.

So far, the only viable option seem to be forms of polycarbonate. If you agree, which form do you think is best? If not, which forms of clear plastic would you prefer for sound insulation?

Thanks in advance for your help!

2007-05-10 20:50:05 · 3 answers · asked by MJ 1

Uranium-238
Thorium-230
Uranium-235
Radon-222

2007-05-10 20:47:29 · 1 answers · asked by Charlie 1

2007-05-10 20:42:50 · 1 answers · asked by Anthony L 1

Can all metals below carbon in the reactivity series be extracted by it??? Because in my science book it says that less reactive metals such as silver copper and lead get extracted by air. E.g. lead sulfide + oxygen -> lead oxide + sulfur dioxide. Bt then it also says that ones below carbon get extracted by carbon so y is it saying that those metals get extracted by air?
Then it had lead getting extracted by carbon as well :S whats extracted by what!!??? Im so confused...

2007-05-10 19:02:24 · 4 answers · asked by Anonymous

2007-05-10 18:28:05 · 2 answers · asked by rawat_gajender 1