Chemistry - October 2007

What is the lattice structure of water and what it looks like?

What are the interactions that hold the structure in place?

2007-10-22 07:40:35 · 2 answers · asked by STAT1 3

HgO -----> Hg + O2
H2 + O2 -----> H2O

could you balance these QUICKLY

2007-10-22 06:48:55 · 9 answers · asked by bubaloo_u_2 1

A: Pure enantiomers rotate the plane of plane polarized light.

B: All chiral compounds rotate the plane of plane polarized light.

C: By using the density of a compound, and it's configuration, we can always calculate the observed rotation of plane polarized light.

2007-10-22 06:47:11 · 2 answers · asked by student217 1

2007-10-22 06:44:30 · 1 answers · asked by student217 1

1) 2-methyl-2-butene +O3===>
2) 2-butene + perbrnzoic acid===>
3) 2,3-dimethyl-2-butene + KMnO4/OH===>
4) cyclohexene + KOC(CH3)3/CHCL3===>
5)ISObutene + CL2 / H2O===>

2007-10-22 06:43:05 · 1 answers · asked by mohamed r 1

2007-10-22 05:15:55 · 1 answers · asked by kind boy 2

and how many grams of HCL are formed?

I cant figure out how to set up the problem.

2007-10-22 03:42:22 · 5 answers · asked by cdf0 1

What was the initial temperature of ethylene glycol if the final temperature is 32.5°C (c of ethylene glycol = 2.42 J/g·K)?

2007-10-22 03:34:46 · 2 answers · asked by Anonymous

An insecticide is known to contain C, H, and Cl. Reactions were carried out on a 1.000g sample of the compound that converted all of its chlorine to chloride ion dissolved in water. The aqueous solution was subsequently treated with an excess of AgNo3 solution and the AgCl precipitated was collected and weighed. Its mass was 2.022g of AgCl.
What is the equation of the rxn?
How many moles of Cl (Cl-) were in the AgCl sample?

A soluble iodide was dissolved in water. Then an excess of AgNO3 was added to completely precipitate out all of the iodide ion as AgI. 1.545g of soluble iodide yielded 2.185g of AgI
What is the equation of the rxn?
How many mol of I (I-) are in the original soluble iodide sample?

2007-10-22 01:36:20 · 1 answers · asked by Anonymous

How much heat is necessary to change 295 g of ice at -10°C to water at 20°C?
kcal

2007-10-21 23:17:19 · 2 answers · asked by Anonymous

You find an unlabelled bottle on the bench. When you test the liquid in the bottle with Universal Indicator, you find that the liquid has a high pH number of 4. Which of the following statements is true?

a) The liquid is salt solution
b)The liquid is an acid
c)The liquid is an alkali
d)The liquid is a weak acid
e)The liquid is a sodium hydroxide solution
f)The liquid is hazardous

2007-10-21 22:18:27 · 10 answers · asked by b b 1

The first order decay of a radionuclide was observed. The initial activity was 0.00658 disintegrations per second per gram and after 317 seconds, the activity was 0.00213 disintegrations per second per gram. What is the half-life, in seconds, of the radionuclide?

2007-10-21 20:00:06 · 1 answers · asked by Anonymous

Also which element is primarily used in standerd flourescent tubes?

2007-10-21 18:29:59 · 2 answers · asked by koko 4

the absolute temperature of the gas at which 3.33 10-3 mol occupies 240. mL at 729 torr

2007-10-21 18:23:57 · 3 answers · asked by Wyatt M 1

In our lab we performed an experiment where we mixed baking soda and hydrochloric acid. The mass of the reactants was more than the mass of the products.. why?

2007-10-21 17:59:34 · 4 answers · asked by Golden B 2

Okay, so I get that Binary Molecular Compounds use prefixes, like N2O is Dinitrogen monoxide because there are two nitrogen atoms and one oxygen. But ionic compounds are more confusing. So I guess all I know is you just name the metallic element and then have and ide or ite after the non-metal element, but what do you call a compund that has like three symbols? For example: Na2CO3. So I would guess that this is Sodium carbonate Oxide or something, but that can't be right because there can't be three words right? Which do you use and why? Also, H2SO4. Is this Hydrogen Sulfide Oxite? Except Hydrogen is weird, it can be a metal or a non metal can't it? So Im basically really confused, and my textbook isn't much help. How do you name ionic compounds?

2007-10-21 17:55:59 · 3 answers · asked by Anonymous

I have two questions:

1) What evidence is there that carboxylic acids are soluble or insoluble in aqueous solution?
2) What evidence is there that esters are soluble or insoluble in aqueous solution?

EXPLAIN THIS EVIDENCE IN TERMS OF MOLECULAR STRUCTURE

your help will be greatly appreciated!!!!!

2007-10-21 17:12:19 · 2 answers · asked by liilee89 1

2007-10-21 17:01:08 · 6 answers · asked by Lionelmessi19ig6 2

Ionization energy is defined as the minimum energy required to remove an electron from the ground state (n0) to infinity (n∞). Determine the wavelength of radiation required to ionize the hydrogen electron from the n = 2 energy level. Calculate the energy (Joules) associated with this photon. (1 cm-1 = 1.986 x 10-23 J)

2007-10-21 16:58:17 · 1 answers · asked by newtype603 2

this is a type of problem that i'm having trouble with:

A student added 50.0 ml of an NaOH solution to 100.0 ml of 0.400M HCl. The solution was then treated with an excess of aqueous chromium(III) nitrate, resulting in formation of 2.06 g of precipitate. Determine the concentration of the NaOH solution.

if you can figure out the answer and explain it a bit that would be great and i will offer you my respect and gratitude. i tried and got 1.932 M NaOH, but i think i did it wrong, so i would like to compare answers.

2007-10-21 16:36:15 · 1 answers · asked by dude 1

In test tube A there is ethanoic acid + ethanol -> ethylethanoate but no drops of sulfuric acid. In test tube B - same thing, but with 3 drops of sulfuric acid. Do the smells differ?

2007-10-21 16:28:07 · 2 answers · asked by Anonymous

Ca3(PO4)2(s) + 5C(s) + 3SiO2(s) ---> 3CaSiO3(s) + 5CO(g) +2P(l)

An initial reaction mixture contains 1500kg calcium phosphate, 250kg carbon, and 1000kg SiO2.

After the reaction the slag was analized. It contained 3.8%C, 5.8%P, and 26.6%Ca by mass. What was the actual yield of phosphorus in Kg? what is the % yield?

(to save time: C is the limiting reactant and the theoretical yield of P is 257.8Kg, according to my calculations)

2007-10-21 16:19:52 · 1 answers · asked by dude 1

Is there anyway to make it so its not all stuck together in a block, and I can pour it again?

2007-10-21 16:16:08 · 5 answers · asked by Anonymous

In test tube A there is ethanoic acid + ethanol -> ethylethanoate but no drops of sulfuric acid. In test tube B - same thing, but with 3 drops of sulfuric acid. Do the smells differ?

2007-10-21 16:11:31 · 1 answers · asked by Anonymous

i have a test tomorrow and this is a type of problem that i'm having trouble with:

A student added 50.0 ml of an NaOH solution to 100.0 ml of 0.400M HCl. The solution was then treated with an excess of aqueous chromium(III) nitrate, resulting in formation of 2.06 g of precipitate. Determine the concentration of the NaOH solution.

if you can figure out the answer and explain it a bit that would be great and i will offer you my respect and gratitude.

2007-10-21 16:10:25 · 3 answers · asked by dude 1

2007-10-21 16:06:20 · 1 answers · asked by C'est Comme Un Rêve 3

Sorry in advance for the extensiveness of this question...I just have a lot of concerns and I'm trying to voice them accurately... So, I love the idea of a liberal arts education-like at colleges such as Williams, Amherst, Middlebury, Bowdoin, but there's one itsy bitsy problem: none of them offer chemical engineering. I plan to study abroad and also study romance languages so liberal arts colleges appeal to me. The liberal arts colleges offer chemistry though. Is it possible to get a B.S. or B.A. in chemistry from a prestigious liberal arts and then attain a major in chemical engineering from a different reputable school? Will a prestigious graduate school such as yale accept me from a liberal arts? Can I still hope to pursue chemical engineering if I go to a liberal arts school?!

2007-10-21 16:05:05 · 4 answers · asked by Angelique 1

Water has a van der Waals constants of a = 5.464 L·atm/mol2 and b = 0.03049 L/mol. What is the pressure of 7.70 moles of water vapor in a 1.10 L container at 100.0°C?

2007-10-21 15:36:53 · 1 answers · asked by Maddi J 2

What would these two equations be when they are balanced:

H20 + SO2H2--->H2SO4

and

CaO2H2 + SO2--->CaSO4 + H2O

(the big numbers are supposed to be the little ones at the bottom of the letters...i just couldn't do it on the comp)

What type of chemical reaction are they synthesis, single replacement, double replacement, combustion, or decomposition?




Then:

Which reaction is endothermic or exothermic?

Enerygy + Reactant--->Product

Reactant--->Product + Energy

2007-10-21 14:31:34 · 2 answers · asked by Anonymous

ughhh science hw :)

2007-10-21 14:26:52 · 7 answers · asked by freakychad 2