Chemistry - July 2007

2007-07-22 15:51:21 · 3 answers · asked by Anonymous

2007-07-22 15:46:57 · 2 answers · asked by Ase 2

2007-07-22 15:07:42 · 2 answers · asked by lulu 1

Lithium and Nitrogen react to produce lithium nitride.

6Li(s) + N(subscipt 2)(g) yields 2 Li (subscipt 3)N(s)

If 3.50g of each reactant are used, the theoretical yield of lithium nitride is

A) 3.52g
B) 5.85g
C) 17.6g
D) 2.93g
E) 8.7g

2007-07-22 14:42:02 · 2 answers · asked by ~daweed~ 3

2007-07-22 14:40:21 · 2 answers · asked by Anonymous

[Identify the conjugate acid/base pairs in the following reactions. For the first pair, list the acid from the reactant side first. For the second pair, list the base from the reactant side first.]


1) HC2H3O2 + H2SO4--------> H2C2H3O2 + HSO4-
_____________ and ____________(1st pair)
***Reactant choices: HSO4(-), H2SO4, HC2H3O2, or
H2C2H3O2(+)
***Product choices: H2SO4, HC2H3O2, H2C2H3O2(+), or
HSO4(-)

________ and ___________ (2nd pair)
***Reactant choices: H2SO4, HC2H3O2, H2C2H3O2 (+), or
HSO4(-)
***Product choices: H2SO4, H2C2H3O2(+), HC2H3O2, or
HSO4(-)

2007-07-22 14:26:02 · 2 answers · asked by Anonymous

Hi This is for my Chemistry Lab 5C follow up questions, it goes

1. In some industrial processes, solutions have impurities removed by single replacement reactions. In electrolytic zinc processes, for instance, impurities of cadmium in the form of CdSO4 are removed from the electrolyte by the addition of zinc dust. Write a balanced equation for this reaction.
2. Write the balanced equation for the electrolysis of water. What type of reaction is this?

Thanks in advance

2007-07-22 14:25:46 · 2 answers · asked by playpwnsu 2

For all of the following experiments, under standard conditions, which species could be spontaneously produced?

A lead wire is placed in a solution containing Cu2+
[Yes or No ] Pb2+
[Yes or No ] Cu
[Yes or No ] PbO2
Cl2 gas is bubbled into a solution of NaI.
[Yes or No ] No reaction
[Yes or No ] Cl-
[Yes or No ] Na
Crystals of I2 are added to a solution of NaCl.
[Yes or No ] I-
[Yes or No ] No reaction
[Yes or No ] Na

Thanks in advance

2007-07-22 14:24:40 · 1 answers · asked by thamvo08 1

2007-07-22 14:19:44 · 2 answers · asked by Anonymous

name: Rubidium Phosphate
formula:?

name: Francium Phosphate
formula: ?

2007-07-22 13:33:17 · 4 answers · asked by Anonymous

Percent yield for the reaction PCl3(l) + Cl2(g) -> PCl5(s) is 83.2%. What mass of PCl5 would be expected from the reaction of 56.7g of PCl3 with excess chlorine?

2007-07-22 13:26:56 · 3 answers · asked by Matthew H 2

2007-07-22 13:24:19 · 6 answers · asked by Guy 1

options:
A) 17
B) 1
C) 8
D) 9

2007-07-22 13:11:38 · 2 answers · asked by anonymous 2

please help me with these problems!! thank yoU!!

1)how many valence electrons?
HNO3

2)how many valence electrons?
HSO3-1

3)When 41.78 grams of sodium thiosulfate are completely dissolved in water, how many moles of sodium ions are present in the resulting solution?

thank you sooooo much!!!

2007-07-22 13:01:42 · 2 answers · asked by Anonymous

2007-07-22 12:03:16 · 7 answers · asked by Kay 1

a. converting ATP to ADP
b. respiration
c. photosynthesis

2007-07-22 10:44:21 · 3 answers · asked by Anonymous

Given the following data:

SrO (s) + CO2 (g) --> SrCO3 (s) delta H= -234 kJ

2 Sr (s) + O2 (g) --> 2 SrO (s) delta H= -1184kJ

C (graphite) + O2 (g) --> CO2 (g) delta H= = -394

Calculate the standard molar enthalpy of formation for SrCO3 (s).

2007-07-22 10:43:32 · 2 answers · asked by hennessee_h 1

2007-07-22 10:34:53 · 4 answers · asked by N.y.Rych 1

Can you please show me step by step on how to get this answer?

The tank contains 55.2 g butane
Butane is used to fill gas tanks for heating. The following equation describes its combustion

2CH410(g) + 13O2(g) -- 8CO2(g) + 10H2O(g)

2007-07-22 09:28:09 · 1 answers · asked by Holly D 3

I just recently went up to Saratoga and collected natural sparkling mineral water, which happends to be riddled with sulfur.

Is there any way to remove most to all of the sulphur?

(Like using a coffee strainer?)

Thanks

2007-07-22 09:19:18 · 1 answers · asked by Anonymous

I was cooking a kids cusine all amercian fried chicken for my lil sis and when i took it out the pudding was bubbling.

What cause the pudding to bubble?

2007-07-22 07:46:29 · 5 answers · asked by I <3 My Hamster Smokey! 6

why the semiconductor as whole is neutral having free elctrons

2007-07-22 07:45:00 · 2 answers · asked by Qarell 1

The a-helix of the secondary structure of a protien is held together by--between two widely separated parts of a protien chain.
a) hydrophobic interactions
b) disulfide bridges
c)hydrophilic interactions
d)hydrogen bonds
e) salts bridges

A glycosidic bond between 2 monosaccharides can also be classified as a(n)

a) double bond
b) ether bond
c) ester bond
d) alcohol bond
e) achiral bond

2007-07-22 07:33:43 · 3 answers · asked by Anonymous

The reason that the 11th electron of the sodium atom is located in the third energy level rather than the second energy level is that the second energy level can only hold a maximum of how many electrons?

- my answer is 3electrons, correct me if i'm wrong please!

2007-07-22 07:32:12 · 3 answers · asked by Anonymous

WO3 + H2 → W + H2O

This reaction is carried out in the lab, and 11.4 g of tungsten are obtained. If the percent yield is 89.4%, what mass of WO3 was used?

2007-07-22 06:34:43 · 2 answers · asked by AudreySmiles 3

Can someone just point me in the right direction w/ this, I need to know the volume of Pb-208, which has a mass of 3.45x10E-22 g and a diameter of 3.5x10e-10 m. I have a lot of questions to answer here but they all require the volume first, so what is the best way to approach this to find the volume in cm3? I'm really confused!

PS: I'm not really looking for the answer just the approach to get to the answer. Thanks

2007-07-22 05:29:48 · 2 answers · asked by camdfw 3

2007-07-22 05:22:44 · 3 answers · asked by Marzouk 1

2007-07-22 04:41:48 · 5 answers · asked by Anonymous

State Three medical use of radioactive isotopes.........

2007-07-22 04:39:01 · 2 answers · asked by Anonymous

2007-07-22 04:32:16 · 4 answers · asked by Anonymous