Chemistry - May 2007

except for hydrogen-1, the mass number of an isotope is always greater than its atomic number. Is the mass number reasonable?__________

2007-05-14 16:11:45 · 2 answers · asked by Anonymous

Hello! I have a demo due tomorrow and I am not able to find chemical equations for this demonstration or the exact chemistry explained in high- school terms so I can make sense of it. Any help would be greatly appreciated!!

2007-05-14 16:11:22 · 2 answers · asked by Sarah H 1

Which is true?
a) [H3O+] > [OH-]
b) [H3O+] = [OH-] divided by Kw
c) [H3O+] < [OH-]
d) [H3O+] = [OH-]
or none of these

2007-05-14 16:04:41 · 1 answers · asked by Anonymous

What are the active ingrediants in krylon spray paint. I'm doing an expiriment for school and need to know.

2007-05-14 16:04:12 · 2 answers · asked by lathan 1

2007-05-14 15:46:07 · 3 answers · asked by youngiftedblackmm91 2

2007-05-14 15:04:11 · 1 answers · asked by enasa n 1

15g magnesium reacts with 30g of calcium phosphate

how many moles of magnesium phosphate are produced?

how many grams of magnesium phosphate are produced.

3Mg+ Ca3(PO4)2->Mg3(PO4)2+ 3 Ca(balanced)

can you please tell me the steps? i took notes but they are confusing....:(

2007-05-14 14:52:29 · 5 answers · asked by Anonymous

What is the empirical formula of N2O5

2007-05-14 14:51:09 · 3 answers · asked by bebostep 2

2007-05-14 14:50:40 · 3 answers · asked by Anonymous

I have a chemistry scavenger hunt project and I need help finding an example of the following and also the reasoning behind it. Illustrate the difference between weight and mass, a hydrocarbon, a covalent molecule, ions, a material other than water that undergoes sublimation, and describe the difference between fusion and fission-- diagram and models may be used

2007-05-14 14:46:18 · 2 answers · asked by Hello! My name is... 1

Calculate the molar mass of a compound if 0.537 mole of it has a mass of 181 g.

2007-05-14 14:42:31 · 5 answers · asked by bebostep 2

I need an example of C4 H10 and an example of it that is reasonable ie: able to bring to high school

2007-05-14 14:41:59 · 6 answers · asked by Hello! My name is... 1

chemistry acids and bases?
Please quick answers?

2007-05-14 14:40:38 · 4 answers · asked by SquiBBLe 2

C + O2 → CO2

2AgNO3 + Cu → Cu(NO3)2 + 2Ag

KOH + HNO3 → KNO3 + H2O

4Fe(OH)2 → 2H2O2 → 4Fe(OH)3

i <3 you all

2007-05-14 14:31:22 · 6 answers · asked by Linds 3

I'm trying to figure out why glue doesn't dry inside the glue bottle. Any ideas?

2007-05-14 14:29:59 · 4 answers · asked by recipe_addict 4

2007-05-14 14:26:10 · 1 answers · asked by Anonymous

If 1.85 G of cinnamic acid were dissolved in 25 mL (0.025 liters) of H20, what would be the ginal concentration of the solution?

Then:

The Ka. for cinnamic acid is 3.47x10^-5, what is the pH of the above solution?

I'm a complete dunce at chemistry, so please please at least answer the first one and then help me with the second. Thanks mucho

2007-05-14 14:16:53 · 3 answers · asked by Anonymous

THE BOILING POINT IS HIGHER for compounds with strong intermolecular forces, or the boiling point is higher for compounds with a high viscosity, or the boiling point of a compound is higher for nonvolatile compounds, or the boiling point of a compound is an absolute constant, or all of them are TRUE

2007-05-14 13:58:44 · 5 answers · asked by Anonymous

1. Describe what happens and explain in terms of kinetic theory, ammonium chloride reacts with sodium hydroxide to produce ammonia gas, water, and sodium chloride. Write a balanced equation.


2. NaNO2 reacts with HCl to produce nitrogen monoxide gas, water, sodium nitrate, and sodium chloride.

2007-05-14 13:16:05 · 1 answers · asked by Anonymous

I did a lab and in it 0.1M NaOH solution was added and it took 6 drops for the color to change but what if 0.2M of NaOH was used would it need less or more drops for the color change to happen?

2007-05-14 12:18:39 · 4 answers · asked by glance 3

give the name and the formula of each molecule or ion that results when one proton is donated by the acid:
(a) NH4+
(b) H2S
(c) H2CO3
(d) H3PO4

give the name and the formula of each molecule or ion that results when one proton is accepted by the base
(a) PO4-
(b) HCO3-
(c) NH3-
(d) C2H3O2-

2007-05-14 12:11:57 · 2 answers · asked by Meno 1

Also...
1-Iron (II) and thiocyanate

2-Lead (II) and Sulfate

3-Dichromate and cobalt (III)

2007-05-14 11:02:55 · 3 answers · asked by xoxo 3

Basically, we had a lab where we preformed titration between a weak acid and a strong base. After the solution went past neutral (> pH 7), the pH level of the solution rose sharply as more base was added, until the solution became highly basic. BEFORE the solution neutralized, the change in pH was VERY gradual.

My question is: Why did the pH of the solution raise so sharply after the solution neutralized?


Any help would be appreciated, I've been trying to interpret the results for a while now with no luck.

2007-05-14 10:53:00 · 4 answers · asked by Anonymous

i need some chemical properties of benzene,
i already have....
- highly flammable
- dissolves slightly in water
- reacts with halogens, sulfuric acid and nitric acid
i need about 3 more! thanksss
also i need the chemical formula, and all the elements present in this compount
THANK YOU!

2007-05-14 10:12:50 · 4 answers · asked by Anonymous

What are the formulas for the following compounds?

17.Chlorite and silver
18.Iron (II) and thiocyanate
19.Dichromate and cobalt (III)
20.Lead (II) and sulfate

2007-05-14 10:07:04 · 4 answers · asked by xoxo 3

2007-05-14 09:54:35 · 1 answers · asked by Anonymous

11.Lead (II) and peroxide
12.Gold (I) and chromate
13.Beryllium and sulfur
14.Tin(II) and phosphorus
15.Manganate and manganese (III)
16.Phosphite and sodium
17.Chlorite and silver
18.Iron (II) and thiocyanate
19.Dichromate and cobalt (III)
20.Lead (II) and sulfate

2007-05-14 09:51:07 · 3 answers · asked by xoxo 3

IF you have an equilibrium reaction with NO2 as the reactant and N2O4 as teh product, which way will the reaction move if one of the substances is removed? Like if you remove the reactant what will happen and if you rmove the product what will happen? Which way will the reaction run and why?

2007-05-14 08:50:45 · 3 answers · asked by Bri 3

What special particle(s) is\are produced besides the daughter element in an alpha decay. How can you use the parent element to determine the daughter element produced by alpha decay?

2007-05-14 08:39:41 · 3 answers · asked by Anonymous

He measured 8 .0 kg of substance X at noon on Tuesday. At noon on Friday, 3 days later, Erwin measured 1.0 kg of substance X. What is the half- life of substance X?

2007-05-14 08:34:16 · 1 answers · asked by Anonymous