Chemistry - May 2007

plz help it has to have a reaction like foaming any ideas of what i could use

2007-05-01 13:40:31 · 3 answers · asked by krissie t 1

I do not even know where to begin with this problem... last math problem of the night, too!! If anyone could help explain it to me, it would be muchhh appreciated =)

How many grams of H20 must be produced if 5 liters of CO2 is produced?

2007-05-01 13:38:00 · 2 answers · asked by alex 1

Taking into account kinetic theory and collision theory...

Are attractive and repulsive forces between particles strong?
Are particles small spheres of insignificant volume?
Is energy conserved when particles collide?
Do particles move in random curved lines?
Must particles collide in the proper orientation to react?

2007-05-01 13:36:51 · 1 answers · asked by W 1

How would u calculate the pH and pOH of the final solution if u have 4.6L of .025M H2SO4 and 1.7L of .125M NaOH and a 74% yield??? I know you have to do something with the excess reactant but i dont know what. PLZ help!!!

2007-05-01 13:29:51 · 1 answers · asked by lucky 1

A rubber balloon was inflated with hydrogen gas. In a few hours, the balloon was observed to be practically deflated. What has happened? Remember the pressure inside the balloon is equal to the atmospheric pressure.


I think it is that hydrogen is lighter than the air outside the balloon which causes the hydrogen to become diffused out of the balloon more quickly. Is that even remotely correct?

2007-05-01 13:28:45 · 4 answers · asked by v. 2

How many calories of heat are needed to change 10g of ice at -20 C to steam at 130 C??

2007-05-01 13:17:55 · 1 answers · asked by kaykay 2

Why do polyatomic ions form, and is there any way to predict this behavior such as there is for monatomic ions? Also, is there any way to predict the charge of a monatomic ion? Be as complex as you like...

2007-05-01 13:16:12 · 1 answers · asked by Matt C 2

jus answer any 3 question...is great if u can answer all of them!! if there is website plz list..if u dunt hav is okay
1)what relationship do u think there is between the date of discovery of a metal?
2)how would chemical reactivity affect the extraction use of metal?
3) Explain why copper is often use as roofing material for large building. y do u think is used for temporary??

THX SO MUCH!!!!^^

2007-05-01 13:09:45 · 1 answers · asked by Platinum. 1

How would I draw the VSEPR structure of SeBr4?

2007-05-01 13:09:34 · 1 answers · asked by Anonymous

A sample of an ionic compoud NaA, where A- is the anion of a weak acid, was dissolved in enough water to make 100 mL of solution and was then titrated with .100 M HCl. After 500 mL of HCl was added, the pH was found to be 5.00. 1.00 L of .100 M HCl was required to reach the stoichiometric point of the titration.

So...
What's the Kb value of A-?

I tried constructing an Ice table and working packwards, but found Kb to be 100,000, so I definitely messed something up. Any help is appreciated, and best answer gets the points. Thanks!

2007-05-01 13:06:59 · 1 answers · asked by Wael K 2

like Iodine, Fluorine, Bromine, and Chlorine. plz anser

2007-05-01 13:00:52 · 1 answers · asked by halley91 1

Taking into account kinetic theory and collision theory...

Are attractive and repulsive forces between particles strong?
Are particles small spheres of insignificant volume?
Is energy conserved when particles collide?
Do particles move in random curved lines?
Must particles collide in the proper orientation to react?

2007-05-01 12:53:18 · 1 answers · asked by W 1

help me plzzzzzzz

2007-05-01 12:47:28 · 1 answers · asked by toni b 1

Sb2S5(aq) + HCl(aq) + HNO3(aq)--> SbCl5(aq) + S(s) + NO(g) + H2O(l)

2007-05-01 12:40:21 · 2 answers · asked by Anonymous

Consider the following galvanic cell at 25°C.

Pt | Cr2+ (0.21 M), Cr3+ (2.4 M) || Co2+ (0.34 M) | Co
The overall reaction and equilibrium constant value are given below.

2 Cr2+(aq) + Co2+(aq) 2 Cr3+(aq) + Co(s) K = 2.79 107
Calculate the cell potential, , for this galvanic cell and G for the cell reaction at these conditions.

i was given K and the Molarity to find Q

i was thinks of this equation
Ecell= 0.0591/2 moles log Q
can someone show me if i am starting problem the right way or the wrong way.
hope someone can assist me in figuring this out. i don't mind if you guy can give me the website with this same of sample question, that would also help.
thanks

2007-05-01 12:39:22 · 1 answers · asked by smile 1

REACTANTS

http://www.upload.ps/uploads250407/ce385bec87.gif

PRODUCTS

http://www.upload.ps/uploads250407/5ee837eb7c.gif

The below questions represent reactions. The letters used for the reactants and products correspond to the compounds above. Thus A + B → E means, compound A reacts with compound B to form compound E.
Look at the above list of reactants and products to the find the compound each letter represents.

Which of the following reactions are correct ? That is, which have the correct product for the given reactants.

a) A + G → Q + H2O

b) B + E → P + H2O

c) C + K → S + H2O

d) D + E → T + H2O

2007-05-01 12:11:53 · 1 answers · asked by tobeever 1

2007-05-01 11:46:11 · 1 answers · asked by SamAzsli 3

2007-05-01 10:41:53 · 1 answers · asked by CH 1

The rontgen or roentgen (R) is a unit of measurement of ionizing radiation in air, either X or gamma rays. It is named after the German physicist Wilhelm Rontgen. A roentgen is the amount of radiation required to liberate a pair of positive and negative charges from atoms of one electrostatic unit of charge in 1.00 cm3 of air at standard temperature and pressure. This corresponds to the generation of approximately 2.08 × 109 ion pairs. A dose of 500 R in five hours is lethal for humans.



If X radiation ionizes 8.7 × 1016 atoms per cemtimeter cubed, what is the ionizing intensity of the radiation measured in roentgens ?

2007-05-01 10:33:48 · 1 answers · asked by Specs76 1

2007-05-01 10:30:06 · 1 answers · asked by navratna s 1

2007-05-01 10:18:15 · 2 answers · asked by Anonymous

right? ... how do you know??? im confused ...

2007-05-01 10:15:49 · 1 answers · asked by M 3

2007-05-01 09:47:10 · 3 answers · asked by Anonymous

Match 1 Answer with the Question.
1. Cell
2. Enzymes
3. glucose
4. mass
5. matter
6. meter
7. organ
8. polar
9. product
10. reactants

2007-05-01 09:46:54 · 1 answers · asked by Travell B 1

2007-05-01 09:42:29 · 5 answers · asked by zo shirazi 1

More of a reassurance than a question, wasn't 100% sure the NaCl was aqueous.

2007-05-01 09:19:25 · 6 answers · asked by Dom 2

Mg (OH)2 + HCL ------> H2O + MgCl2

2007-05-01 09:15:15 · 7 answers · asked by Candice 3

What to do if Hydrochloric acid (Not incredibly strong concentration I'm using 0.1mol/dm3 but i could do with knowing the general things to do with general concentrations).

What to do if:
Spilt on a surface/floor
Spilt on clothing/skin
Ingested
Splashed on eyes

and how to dispose of it.

thanks in advance

2007-05-01 08:55:22 · 3 answers · asked by Dom 2

Please help, want to make soap from lye water made from ashes, but cannot get the concentration right, getting contradicting information. Anyone experienced with this art. Need to teach some students who live in remote parts of Africa! Please note, there's no caustic soda available. Just firewood for the ashes and animal fat to make the soap.

2007-05-01 08:35:39 · 2 answers · asked by Anonymous

2007-05-01 07:08:48 · 2 answers · asked by shreadmaster775 1