Chemistry - December 2007

I am trying to figure out an example in my chemistry book. The question says: How many atoms are in 3.3 X 10^ -(negative)3 of gold. I know that the conversion factor is (.0033/197) X 6.022 X 10^23. What I cannot figure out is that the book has an answer of 1.0 X 10^20 atoms Au. However, when I type in these numbers on my calculator I get 1.0 X 10^19 atoms Au. Can someone explain why the answer is what my book says it is? Thank you!

2007-12-18 12:41:00 · 4 answers · asked by Steven M 3

carbon hydrogen oxygen please help!! lab science work do not know.

2007-12-18 12:17:16 · 2 answers · asked by z 2

Please help? jus answer the ones that you know, thanks.

1) What is the number of possible isomers for C4H8 ?
a) 6 b) 3 c) 5 d) 2
2) 1,1,2-trimethylcyclopentane is an isomer of which
compound? -a) nonane, b) isoheptane,
c) 2-isopropyl-pentane, d) isohexane
3) Which compound can react with chlorine gas to produce
1,2-dichlorocyclohexane? -a) hexane b) cyclohexene
c) 3-methylcyclohexane d) 2-methylhexane
4. When ethane is converted to ethylene, the carbon atoms:
a) are oxidized b) are reduced
c) act as oxidizers d) are unchanged
5. What is the bond angle between H-C-C in acetylene?
a) 180 b) 90 c) 109 d) 120
6. A benzene compound with a bromine in the 1 and 3
positions has the common name of:
a) o-dibromobenzene b) p-dibromobenzene
c) m-dibromobenzene d) dibromobenzene

2007-12-18 12:14:24 · 5 answers · asked by Anonymous

ok so what is that charts name that you need to be able to see if one element is able to replace another... if you dont know the name could i just have the list

2007-12-18 12:14:07 · 4 answers · asked by Anonymous

Please classify them


Ba(CN)2 = H2SO4 ---> BaSO4 + HCN


Al + CuSO4 --->Al2(SO4)3 + Cu

2007-12-18 12:08:35 · 2 answers · asked by Istis 3

I have to build this neon atom for Chemistry and I dont have any idea how to start it. I know I'm using Christmas bulbs for it though. Can anyone explaine to me how to do this, or where on the internet I can look for help???PLEASE

2007-12-18 12:01:04 · 1 answers · asked by Anonymous

the combined form of chlorine is ClSO4,ClO and the Magnesium is MgO and MgSO4..plz answer

2007-12-18 11:57:14 · 1 answers · asked by Anonymous

Hypothetically speaking, lets say there was 3 elements A B and C. We figured out that the ratio is 1:2:3.
How do we know how to write the formula?
AB2C3, B2C3A, C3B2A all fit the ratio, so how do we determine the order? Does it have to do with the mass number?

2007-12-18 11:12:58 · 4 answers · asked by Anonymous

i need to find the concentration of NaCO3
what acid should i titrate with?

2007-12-18 11:04:35 · 2 answers · asked by bubblyy 1

In addition to telling the answer, please reveal the step-by-step process you used to get the answer. I'm really trying to learn this, and not just use YA for getting answers.

Thank you.

2007-12-18 10:52:19 · 5 answers · asked by Robert B 3

Why are some elements/compounds paramagnetic, while others aren't, i think it's something to do with the D orbitals. but i'm not sure

thanks for any answers (within reason)

2007-12-18 09:34:31 · 1 answers · asked by WillsBradford 2

elemental fluorine F2, was not used in the halogens experiment because of difficulties in handling it. Also elemental astatine At2, was not used because of its radioactivity and short half life. How would you expect the reactivity of F2, and At2 to compare with those of the elemental halogens tested in the experiment.

I've understood every other question on this lab, but somehow this question has trumped me. :(

2007-12-18 09:27:39 · 1 answers · asked by Green Jeans 1

useing the compressed output of hydrogen and not trying to make electricity out of it,,what is the difference between these two words (orthohydrogen) and (parahydrogen) also what one would be useing a coil of wire and how would it be constructed

2007-12-18 09:20:12 · 1 answers · asked by tugboat 4

ok so i have a double displacement reaction the reactants are in ml they are aqueous solutions, anyway i need to find the precent yeild, i already have the actual yeild but how do i find the predicted yield?

2007-12-18 09:18:33 · 2 answers · asked by xxx_rocker_chick_xxx 3

What is the diffrence between the two I want to know it perfectly my book is not clear

2007-12-18 09:13:52 · 2 answers · asked by Anonymous

It seems like it should be easy, but I can't figure it out. Thanks so much, final is tomorrow.

2007-12-18 09:05:25 · 1 answers · asked by lar285 1

To what temperature must a 350 ml gas sample at 26 C and 101 kPa be heated to increase its pressure to 175 kPa while in the same container.

I need to have this equation put into a formula with an answer, if you can please help me and put an explanation along with it, that would be great!!

I need that asap!! by today

2007-12-18 08:58:21 · 5 answers · asked by Bronco_Fan 1

a number
not man made

2007-12-18 08:56:19 · 2 answers · asked by nick18cs 2

thankyou!

2007-12-18 08:53:06 · 2 answers · asked by demarestian 1

A mix of 2 (for simplicity) liquids at known concentrations is placed into a sealed vial. All physical parameters of liquids are known, e.g. MW, Density, Vapor pressure & any other that might be needed. The volumes of both vial and the mix in it are also know.
After gas-liquid equilibrium is achieved, what are concentrations of the compound in the liquid phase.

I'll appreciate any intermediate answers as well, i.e. #moles of either in either gas or liquid.

2007-12-18 08:53:03 · 1 answers · asked by Alex 4

2007-12-18 08:15:15 · 3 answers · asked by Anonymous

We did a lab in school today on enthalpy and the heat of solutions. There was a question about why we shouldn't use the thermometer to stir the solution in the calorimeter (ours was just a makeshift one, a tiny styrofoam cup). So, why is it wrong to use a thermometer to stir the solution?

2007-12-18 07:06:33 · 4 answers · asked by Fanuilos 2

NaCl x H2O -->electrolysis (1/2)H2 (1/2)Cl2 NaOH.


And I can then use this Lye to make soap also?

2007-12-18 06:56:35 · 1 answers · asked by Anonymous

2007-12-18 06:33:29 · 3 answers · asked by Anonymous

2007-12-18 06:32:51 · 6 answers · asked by Anonymous

2007-12-18 06:30:02 · 1 answers · asked by Anonymous

A bubbling B boiling C lcold light D heat E color change F tempeture drop G smoke H explosion

2007-12-18 06:26:33 · 2 answers · asked by Skip 4

Like when and where it was discovered, and who discovered it, and what type of element it is, from which family it came from, what period, and its isotopes and uses.. Its for a project for science. =] and anythiing else that is useful

2007-12-18 06:00:03 · 7 answers · asked by mboylover294 1

2007-12-18 05:29:17 · 1 answers · asked by TL 1

2007-12-18 05:28:29 · 4 answers · asked by TL 1