Chemistry - February 2007

like a concentration of 1.0 M of NaCl what is cation and anion formed and the cation and anion concentration??
how do you find it??

2007-02-22 08:32:00 · 2 answers · asked by molly 1

why is the reaction rep. by the following equation a redox reaction?
2Hg+O2->2HgO

what happens when the chemicals are put into a ice bath?
2NO2<---->N2O4+Energy

which of the following supports the converstion of mass?
MgO+H3PO4<---->Mg3(PO4)2+H2O
A) 3MgO+2H3PO4<---->Mg3(PO4)2+3H2O
B) 3MgO+2H3PO4<----->Mg3(PO4)2+2H2O
C) 6MgO+H3PO4<---->Mg3(PO4)2+3H2O
D) 6MgO+2H3PO4<--->2Mg3(PO4)2+6H2O

Which equation describes a synthesis reaction?
A) Ba(OH)2+2HCl<--->BaCl2+2H2O
B) Ba4+2O2<--->CO2+2H2O
C) Zn+CuSO4<--->Cu+ZnSO4
D) 2H2+O2<---->2H2O

2007-02-22 08:27:31 · 3 answers · asked by Anonymous

A rule of thumb often used by chemists is that reaction rates double for every 10 degrees C by which temperature is raised. Is this true?

2007-02-22 08:19:57 · 3 answers · asked by pa0250 1

Changes in concentration do not change the value of Kc as long as the temperature remains constant. However, changes in temperature change the value of most equilibrium constants. Please explain.

2007-02-22 08:18:45 · 2 answers · asked by Anonymous

Okay I am balancing equations in science and i really dont get what we are doing. I need to know what to do next because i am really lost. here is the problem:
AgNO(subscrpit 3) +Cu yield Cu(NO(little 3 at bottom)) (little 2) +Ag
I know that might be confusing but if you understand the problem can you plz help me with the next step?

2007-02-22 08:18:21 · 5 answers · asked by Anonymous

2007-02-22 08:18:04 · 1 answers · asked by Random G 3

For example, the heisenburg uncertaintly principle is valid for all electrons or the atomic structure of hydrogen is valid for all hydrogen atoms.

2007-02-22 08:09:34 · 1 answers · asked by Brian M 1

2007-02-22 07:38:20 · 5 answers · asked by ethan g 1

2007-02-22 07:38:17 · 3 answers · asked by Anonymous

2007-02-22 07:26:51 · 5 answers · asked by Anonymous

What is the balanced equation for Mandelic Acid? I can't seem to work this one out !!!
With a molar mass of 152.14g/mol, what is the emperical formula?

ie: 2H + O -> H2O

Then what is Mandelic Acid's?

Please advise

2007-02-22 07:17:54 · 8 answers · asked by Anonymous

need this for chemisrty thanks

2007-02-22 06:59:25 · 2 answers · asked by mitch v 1

solubility of Li2CO3 decreases with increase in temperature but solubility of sodium chloride, potassium chloride and Silver nitrate increases.

2007-02-22 06:59:14 · 1 answers · asked by momo 1

need this for chemistry thanks

2007-02-22 06:58:48 · 2 answers · asked by mitch v 1

For example can it be soaked and stored some how??

2007-02-22 06:56:19 · 6 answers · asked by Anonymous

And if so, will it put out the fire?

2007-02-22 06:46:22 · 4 answers · asked by Anonymous

2007-02-22 06:32:16 · 1 answers · asked by Anonymous

A buffer solution is prepared by adding 0.250mol of KOH(s) to 1.0L of 0.200M H3PO4 solution. pH of the buffer solution is....?
Thanks a lot. I'm doing a review for my exam tomorrow when i stumbled at this question

2007-02-22 06:25:37 · 1 answers · asked by lisacan 2

i am doing a science fair project on what detergent gets rid of oil the best and i need a way to set it up. and it would be nice if i could get some more info on that subject, so if you could help that would be a big thanks.

2007-02-22 06:23:21 · 3 answers · asked by M. 2

2007-02-22 06:17:07 · 2 answers · asked by <3 1

2007-02-22 06:16:54 · 9 answers · asked by henry f 2

2007-02-22 06:16:13 · 1 answers · asked by quentin032000 3

pliz help????????? otherwise my chemistry teacher is goin to KILL me, trust me she is hell!!!!!!!

2007-02-22 06:14:31 · 2 answers · asked by DODO 1

2007-02-22 05:57:35 · 2 answers · asked by <3 1

2007-02-22 05:49:56 · 1 answers · asked by <3 1

H2(g) + I2(g) ↔ 2HI Temperature = 731K

2.40 mol of H2 and 2.40 mol of I2 are placed in a 1.00 L vessel. What is the equilibrium concentration of H2 in the gaseous mixture?
The equilibrium constant is K = 49.0

2007-02-22 05:38:20 · 2 answers · asked by xdmandyxp 1

The reaction

N2O4(g) ↔ 2NO2(g)

is an equilibrium reaction at some temperature with an equilibrium constant K = 4.00 x 10−7.
If the intial condition is pure N2O4(g) at a concentration of 2.20 mol/L what is the equilibrium concentration of NO2 in mol/L ?

2007-02-22 05:37:34 · 3 answers · asked by xdmandyxp 1

For the gas reaction


2NOBr ↔ 2NO + Br2 ΔH = + 61.1 kJ


which of the following statements are true?


a) Adding more Br2 shifts reaction to the left

b) Removing some NOBr shifts reaction to the right

c) Decreasing temperature shifts reaction to the right

d) Only a change in temperature will change Kp

e) The use of a catalyst will shift the reaction to the left



you must enter all true statements in one alphabetical lower case group, e.g., if a) b) and e) are true you would enter abe

2007-02-22 05:30:26 · 2 answers · asked by Djuna 2

While the metal is in liquid state can you further burne it with a much more higher temperature can you evaporate it? if you can , can you specify the grade ( in celsius)

2007-02-22 05:29:50 · 8 answers · asked by Anonymous

i need examples please ! ;] Some compounds are hydrated and some are not. Do you have any examples of hydrates used in everyday chemicals?

2007-02-22 05:28:16 · 4 answers · asked by herroworld 1