Bridget Jones

Shouldn't 7 alpha decays be [math]^{206}_{78}\mbox{Pt}[/math] ?

 

I realize this may just be an exercise in writing out the steps' date=' but there's no way that this result is physically real. [math']^{214}_{82}\mbox{Pb}[/math] only beta decays. You have to include that, along with some other (unlikely) branching, to arrive at [math]^{206}_{80}\mbox{Hg}[/math]

Yes you're right, thanks. Glad it was hypothetical and not an actual answer to an assignment!

So let me get this right if I was for example expressing flourine, I should write:

{9}^{19} F ?

Thanks for that Dave. This is the first time I've used a forum so format of my post not that good, guess I have to work on that one!

Hi

Please could anyone advise the best way to show 7 successions of alpha decay on: 234

U

92

I know the answer is 206

Hg

80

Should I show it as 7 different stages eg. stage 1 234 230 4

U ---- Th + He

92 90 2

Stage 2 230 226 4

Th ------ Ra + He

90 88 2

etc etc

or can I simplify it as :

234 206 4

U ------- Hg + 7( He )

92 80 2

Hope this makes sense, I would be most grateful for any advice.

Thank you

In this piece of homework I am asked to describe the process I would use to prepare a sample of dry hydrogen selenide.

 

I am given serveral materials to do so :

 

Liquids :

 

concentrated nitric ccid

concentrated hydrochloric acid

water

 

Solids :

 

calcium chloride granules

sodium chloride

aluminium selenide

sodium hydroxide

 

Solid aluminium selenide will react with water to form solid aluminium hydroxide [Al(OH)3] and hydrogen selenide gas (H2Se). I need to isolate and dry the hydrogen selenide gas (which is denser than air).

 

How would I do this?

 

EDIT : After some thought' date=' I've considered this :

 

I'll use two addition funnels, the top with water in it, and the bottom with aluminium selenide. Water will be allowed through by undoing the valve, and the two substances will react. The valve on the water funnel will then be closed and the gas will escape through a tube on the side. The hydrogen selenide gas will then pass through a u-tube filled with calcium chloride granules to dry the gas. Finally, another tube will take the gas into a jar for collection . [/b']

 

Would this work?

 

Thanks.

Hey, Guess you must be studying via the OU!

Hey, Guess you must be studying via the OU!