Qualification > Sciences

IGCSE CHEMISTRY DOUBTS

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Ivo:

--- Quote from: ~VIN1094~ on June 07, 2010, 12:13:41 am ---This is right..w09 paper, some q. talks about this.

--- End quote ---

Thanks for all your help.  I have added the reputation, and a very long comment!  Enjoy reading it, or shall I say enjoy your good night's sleep!  Wow, 4am, you better go!

Lariemeeva:
On which bases can we determine that a metal would react with dilute HCL?

Dana:
2 questions,
1st, there was a qs in stoichiometry and the answer was that there were 0.03 moles of O2 molecules then they asked how many moles of oxygen atoms will there be. the answer is 0.06. i dont get why :/ isnt it supposed to be the opposite? like you half it instead of twice it? :/

and second question, in CO2 are the C and the O bonded by a double bond? cuz if theres only a single bond then there are only gonna be 6 e's around C

Vin:

--- Quote from: Lariemeeva on June 07, 2010, 09:14:35 am ---On which bases can we determine that a metal would react with dilute HCL?

--- End quote ---

Reacts with metals which are higher than hydrogen in the reactivity series.



^^Why? Because a metal lower than hydrogen (Copper/Silver/Gold/Platinum) wont be able to displace H2 from HCl

Lariemeeva:
Right, thanks a lot!

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