Chemistry - July 2007

2007-07-01 15:50:15 · 2 answers · asked by shell 1

i know that MgCO3 can be dissolved by HNO3 so how can i write an ionoc equation with these two?

2007-07-01 15:48:16 · 4 answers · asked by ... 3

2007-07-01 15:02:24 · 11 answers · asked by Danny 2

alright.
i need to know how to cool or freeze something (such as food) very quickly (such as in just a few seconds or minutes) and effiently. like a chemical or gas or some kind of electric wave or something.
please, no smart elic answers like 'just use ice' or 'a refrigerator might work'! i dont have time for that.

thank you in advance.

2007-07-01 13:17:47 · 11 answers · asked by Jordan 1

Hence the phrase Piss and Vinegar.

2007-07-01 13:13:43 · 4 answers · asked by noam c 1

1)what is the mass, in grams, of a cubic meter ofblasa wood if the density of balsa wood is .02 g/mL?

2)A student measures a volume as 25 mL, whereas the correct volume is 23 mL. What is the percent error?

3)What is the volume of 700.0 g. of ether if the density of ether is .70g/mL?

4)The density of aluminum is 2.70 g/cm cubed. what is the mass of a cube of aluminum 1.oo cm on each edge?

5) A 10 cm cubed sample of an unknown liquid has a mass of 1.4x10(to the fourth power) mg. What is the density of the liquid in g/cm cubed?

2007-07-01 11:49:57 · 3 answers · asked by Becca 1

I Just asked this answer and got some great responses. But what Im wondering is how do I find the Ka of a weak acid or base without any values?


Thanks in adavance. This type of questions always trip me up on tests. Basically Im being asked which of the following anions is the strongest base?
ClO-
ClO3-
ClO4-
Cl-
I-

How am I supposed to know? For reference Im studying pH & pOH.

2007-07-01 11:16:44 · 3 answers · asked by Anonymous

Last question and I'm done =)

I have to predict which element has

a) A positive electron affinity
b) A very high first ionization energy
c) One of the smallest atomic radii in it's period

correct me if I'm wrong, but don't "a" and "b" contradict each other?

Which element has those 3 properties?

2007-07-01 11:06:46 · 2 answers · asked by Anonymous

A. a base.
B. an acid.
C. a source of hydroxide ions.
D. a source of H- ions.
E. a proton acceptor.

2007-07-01 10:05:10 · 1 answers · asked by wonderwoman 1

I have s recent roach invasion. Combat no longer works. I have been putting boric acid powder around... but some of them have retreated into the stove!

If I put it on the bottom floor of the stove (not the kitchen floor itself) under the broiler (which is under the gas burners that broil the food & heat the oven are located) do I have to worry about a heat/boric acid reaction? I rarely broil or bake, so if I have to sweep out the boric acid every time I use the oven, I will... but is it safe? Will the high heat transform the boric acid powder, perhaps release toxic fumes?

Thanks in advance...

(PS: I have cats, too...)

2007-07-01 09:21:07 · 4 answers · asked by aspicco 7

a)HCl
??? H30+ Cl-
b) CH4

c) HSO3-

d) H2SO4
?? H3O+ SO4^2-

e) NH3

f) HClO4

2007-07-01 08:43:08 · 4 answers · asked by Anonymous

a) Fe^3+ + 6H2O <----> Fe(H2O)6^3+
acid = Fe
base = H2O

b) BF3 + NH3 <-----> F3BNH3
acid= ??
base= ??

c) BF3 + F- <-----> BF4-
acid= BF3
base= F-

d) H+ + Cl- <----> HCl
acid= H
base= Cl

Are any of these right?!? Just very confused and any help with this would be appreciated!
and
Do you just identify the left side of the reaction as Lewis acids and bases, or both?

2007-07-01 08:36:43 · 2 answers · asked by Anonymous

Besides a bond, is there space between atoms in matter?

2007-07-01 08:20:22 · 3 answers · asked by justin s 1

I know people have used dw liquid for detergent , but how about the other way around?

2007-07-01 07:03:13 · 5 answers · asked by brut44 1

A sample of a volatile liquid is vaporized completely in a 240 cm3 flask at 135°C and 1200 mm Hg. The condensed vapor (liquid) weighs 0.837 grams. What is the molecular weight? The liquid contains 64.9% carbon, 13.5% hydrogen, and 21.7% oxygen. What is the molecular formula?

2007-07-01 03:57:10 · 2 answers · asked by Anonymous

A solute, which has i = 5, is placed in 5430 g of nitrobenzene. If the freezing point is lowered to 3.29°C and the mass of the solute is 37.8 g, find the molecular weight.

2007-07-01 03:28:43 · 1 answers · asked by brian b 1

2007-07-01 03:10:17 · 10 answers · asked by Anonymous

give 5 examples each

2007-07-01 01:51:25 · 6 answers · asked by nivea s 1

Potassium permanganate was used as the oxidizing agent, and sulfuric acid and sodium hydroxide were the acid and base respectively. Thanks.

2007-07-01 01:00:49 · 3 answers · asked by Anjo 2

we have a debate tomorow about this topic, please give me a complete answer or reference, thank you

2007-07-01 00:15:17 · 4 answers · asked by rassel jan d 1