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Hey,
in the AQA June 2010 Chemistry Unit 1 paper, a question came up, saying why SO2 would react with CaO, and the answer was because SO2 is an acidic gas.
My question is, how can you tell if a gas is acidic or alkaline (without carrying out any pH tests)?
Thanks a lot
in the AQA June 2010 Chemistry Unit 1 paper, a question came up, saying why SO2 would react with CaO, and the answer was because SO2 is an acidic gas.
My question is, how can you tell if a gas is acidic or alkaline (without carrying out any pH tests)?
Thanks a lot
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#3
(Original post by thegodofgod)
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(Original post by gozatron)
Have you come across Lewis bases and Acids in chemistry yet?
Have you come across Lewis bases and Acids in chemistry yet?
, only AS, i think that comes in A2 if i'm not mistaken
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#5
(Original post by thegodofgod)
Hey,
in the AQA June 2010 Chemistry Unit 1 paper, a question came up, saying why SO2 would react with CaO, and the answer was because SO2 is an acidic gas.
My question is, how can you tell if a gas is acidic or alkaline (without carrying out any pH tests)?
Thanks a lot
Hey,
in the AQA June 2010 Chemistry Unit 1 paper, a question came up, saying why SO2 would react with CaO, and the answer was because SO2 is an acidic gas.
My question is, how can you tell if a gas is acidic or alkaline (without carrying out any pH tests)?
Thanks a lot
Non-metal oxides = acidic or neutral
Metal oxides = basic or amphoteric
You are supposed to know that non-metal oxides are acidic, with the exception of non-metal oxides of elements in the lowest oxidation state, such as carbon monoxide and nitrous oxide, both of which are neutral...
You should also be able to link SO2 and NOx gases with acid rain...
In terms of alkaline gases, there is only one and that is ammonia.
Other (non-oxide) gases you should just learn, there's not many of them:
Chlorine is acidic, but rapidly bleaches indicator paper:
Cl2 + H2O --> HCl + HOCl
Hydrogen chloride is very acidic
Oxygen is neutral
Hydrogen is neutral
Nitrogen is neutral
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(Original post by charco)
In general:
Non-metal oxides = acidic or neutral
Metal oxides = basic or amphoteric
You are supposed to know that non-metal oxides are acidic, with the exception of non-metal oxides of elements in the lowest oxidation state, such as carbon monoxide and nitrous oxide, both of which are neutral...
You should also be able to link SO2 and NOx gases with acid rain...
In terms of alkaline gases, there is only one and that is ammonia.
Other (non-oxide) gases you should just learn, there's not many of them:
Chlorine is acidic, but rapidly bleaches indicator paper:
Cl2 + H2O --> HCl + HOCl
Hydrogen chloride is very acidic
Oxygen is neutral
Hydrogen is neutral
Nitrogen is neutral
In general:
Non-metal oxides = acidic or neutral
Metal oxides = basic or amphoteric
You are supposed to know that non-metal oxides are acidic, with the exception of non-metal oxides of elements in the lowest oxidation state, such as carbon monoxide and nitrous oxide, both of which are neutral...
You should also be able to link SO2 and NOx gases with acid rain...
In terms of alkaline gases, there is only one and that is ammonia.
Other (non-oxide) gases you should just learn, there's not many of them:
Chlorine is acidic, but rapidly bleaches indicator paper:
Cl2 + H2O --> HCl + HOCl
Hydrogen chloride is very acidic
Oxygen is neutral
Hydrogen is neutral
Nitrogen is neutral
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#8
all non-metal oxides are acidic while all metal oxides are basic. ammonium oxide is basic too
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