Re: Archers Plus Moonlighting: Monday 7th Periodic Table (times various)

On Tue, 08 Nov 2005 17:13:47 GMT, stephenbowden@xxxxxxxxx (Stephen)
wrote:


>>
>>What has reacted with got to do with weight?
>
>The point about Atomic weight is that it is *relative* weight - and
>Dalton took Hydrogen as 1. If 1 grain of hydrogen burns to create 9
>grains of water, and water is made of equal parts of Hydrogen and
>Oxygen, then the 8 grains that aren't hydrogen must be oxygen, so its
>relative weight must be 8.
>
>>>Once he realised that water was H2O he revised the latter figures to
>>>16 and 18. And so on.
>>How do they know hydrogen is one H and two O?
>>I mean, I know they did experiemnts, but what? I still don't see it.
>
>Given sufficiently precise measurements it is possible to burn a fixed
>volume of hydrogen in varying volumes of oxygen (at the same pressure
>and temperature) and see how much oxygen it takes to completely burn
>the hydrogen to water. It turns out that you need half the amount of
>oxygen as hydrogen.

They are gas, so aren't they invisible? How do you know which one is
there? I can see you will know when it is water, as can see that.


.

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