Chemistry - October 2006

2006-10-01 07:33:01 · 7 answers · asked by mojojojo 2

An element consists of two isotopes of mass 36.1891 amu and 44.23836 amu. If the average atomic mass of the element is 39.204 amu. Calculate the percent abundance (percent of each isotope that is contributed to making the mass of the overall element) of the first isotope.

2006-10-01 07:32:11 · 1 answers · asked by Anonymous

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2006-10-01 07:31:33 · 3 answers · asked by mojojojo 2

2006-10-01 07:30:46 · 2 answers · asked by Pseudo Obscure 6

2006-10-01 07:15:23 · 4 answers · asked by glance 3

In my chemistry class we did a density lab, calculating mass and volume of a certain colored cylinder. In our report, we have to discuss one source of error not relating to human error or equipment error. I was thinking that either barometric pressure or altitude might affect the outcome, but I'm not really sure what else could have had an affect. Any help would be much appreciated!

2006-10-01 07:01:58 · 6 answers · asked by doublecoolwithknobs13 1

2006-10-01 06:57:43 · 3 answers · asked by Anonymous

in the above question i have used 2H+ to show a single positive H ion and Mg++ to show dipositive Mg ion.the other + signs are for showing the reaction. in the H2 2 has to be written down but i couldn't do it in the computer. the answer says it is 50 cm cube as 1 mole of Mg reacts with 500 cm cube of 4M HCL. but there is no HCL in the equation, so how is this statement true and how was 50 cm cube derived?

2006-10-01 06:57:09 · 2 answers · asked by bisal 1

I have a report to do about his atomic theory. I have to include how he found it, most website only include what it is, but not how he arrived at it. If you know or know a website that has this information please help! Thankyou

2006-10-01 06:52:11 · 2 answers · asked by alex e 3

how strong are plastic wraps?
what are plastic wraps?

2006-10-01 06:25:30 · 3 answers · asked by casey c 1

For the past months now, I have been getting myself into alot of space topics. I really am starting to find this entire topic very intresting. I started from scratch, with our planets, solar system, galaxies, and I kept moving on..

Where am I now? Well, I just finshed reading about the cosmic microwave background radiation, which seems to be really amazing, considering its existent everywhere in our universe. I have also learnt about how the universe expanding, with the evidence that stars around us appear red shifted.

I never thought I would dig deeper than this, but I am, and now I want to enter this field.

Anyway, yea so I am investigating problems with the Big Bang, and there seems to be three really big ones, that I dont seem to understand.

1.) Horizon Problem
2.) Flatness Problem
3.) Density Flucation Problem

Anyone here have any knowledge on these topics?

Thanks for reading.

2006-10-01 05:47:51 · 5 answers · asked by Xeel 1

2006-10-01 05:28:10 · 3 answers · asked by Anonymous

for arsenic

2006-10-01 05:20:16 · 1 answers · asked by gopistons 4

thanks so so much!!!!! ;'>

2006-10-01 04:46:33 · 1 answers · asked by Anonymous

2006-10-01 04:35:55 · 18 answers · asked by Anonymous

2006-10-01 04:35:19 · 3 answers · asked by susie 1

In February 2006 researchers.reported at the American Society for Microbiology, that a solution of vinegar and household bleach could be used, not just as a powerful disinfectant, but as a very effect sterilizing agent against bacterial spoors dried onto test surfaces. According to the researchers, " Bacterial spoors dried onto surfaces are considered the most resistant to disinfectants of all microbes, and a disinfectant that can kill such spoors would be expected to also kill all types of vegetative bacteria, fungi, mycrobacteria (TB), and viruses." They found that the vinegar bleach solution sterilized all of the surfaces tested within 20 minutes, while a diluted bleach solution alone was only effective in killing all of the spoors on 2.5 percent of the surfaces after 20 minutes.

Source:http://www.apple-cider-vinegar-benefits.com/vinegar-as-a-disinfectant.html

OK so it's effective and safe to use on counters & other surfaces, but is it safe to use on eating utensils as well?

2006-10-01 03:40:26 · 7 answers · asked by Seeker 4

There is a desalter and the water source has a high concentation of ammonia(NH3,ABOUT 200 PPM).do injection this water prevent seperating salt and watr from the crude in desalter

2006-10-01 02:17:25 · 2 answers · asked by khalil g 1

what is the variation in volume of a fixed amount of gas with respect to its temperature at constant pressure?

2006-10-01 02:16:47 · 3 answers · asked by sweetgurl_16 1

How much can u tell about each element just from using the periodic table? and how?
Like how the groups tell u how many electrons there are. and the numbers on the left hand side have something to do with the period number or number of shells.

And if u know any helpful sites.
Thanks

2006-10-01 02:16:35 · 2 answers · asked by yassem1ne 2

I have heard that alkiline helps rid the body of asidic waste. Does it? Is baking soda alkiline? What other foods are?

2006-10-01 02:10:39 · 2 answers · asked by Leslie S 1

How can the arrangement of elements in the Periodic Table be used to predict how they react with other elements to form compounds?


one of my homeworks...

2006-10-01 01:45:47 · 3 answers · asked by L3!H 1

Can anyone tell me the method to use to calculate the rate of reaction between potassium bromate and bromide ions (using sulphuric acid)? I will be varying the temperature and concentration.
Thankyou!

2006-10-01 01:16:10 · 5 answers · asked by ah1 1

what is an octet of electrons? and which elements contain an octet of electron?

the first right answer gets ten....... i need this now.....

2006-10-01 00:33:22 · 5 answers · asked by <--tsk--> 3

2006-10-01 00:26:07 · 8 answers · asked by L3!H 1

it's my project of biology class.we have to make a model that is 3D.

2006-10-01 00:10:28 · 1 answers · asked by Reshma 1