Scitty
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#1
Report Thread starter 5 years ago
#1
Hi there,

I've been wading through AS and A2 past papers trying to compile a list of chemicals we should know, and the uses for them (e.g. in questions where they ask you to name a given structure, and suggest a use for it).

So far I've got:

MgO: AS - Magnesium Hydroxide. Anti-acid medication.
BaSO4: AS - Barium Sulphate. Its insolubility makes it useful for barium meal x-rays to evaluate the function of a patient’s digestive system.
CaOH: AS - Calcium Hydroxide. Used to adjust pH of soil and lakes.
Phenylamines: A2 - Amino group attached to a benzene ring. Used in herbicides, and as dyes and explosives.
Cl2: AS - sanitising water by reacted with H2O to form HOCl.

I find it a lot easier to learn the uses and chemicals by themselves than with them integrated into each relevant sub-unit, but I know that's not a complete list, so are there any more I need to add to learn?

(I'm resitting CHEM2 during A2, hence some AS mentions.)

Cheers!
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Infraspecies
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#2
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#2
(Original post by ThatMadClown)
Calcium Hydroxide is also known as limewater, and is used to test for carbon dioxide.
Calcium hydroxide is only called "limewater" when it is used to make a saturated solution.

Ca(OH)2 (s) is known as "slaked lime".
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username1426305
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#3
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#3
You could also say that potassium dichromate is used as an oxidising agent.
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charco
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#4
Report 5 years ago
#4
(Original post by Scitty)
Hi there,

I've been wading through AS and A2 past papers trying to compile a list of chemicals we should know, and the uses for them (e.g. in questions where they ask you to name a given structure, and suggest a use for it).

So far I've got:

MgO: AS - Magnesium Hydroxide. Anti-acid medication.
BaSO4: AS - Barium Sulphate. Its insolubility makes it useful for barium meal x-rays to evaluate the function of a patient’s digestive system.
CaOH: AS - Calcium Hydroxide. Used to adjust pH of soil and lakes.
Phenylamines: A2 - Amino group attached to a benzene ring. Used in herbicides, and as dyes and explosives.
Cl2: AS - sanitising water by reacted with H2O to form HOCl.

I find it a lot easier to learn the uses and chemicals by themselves than with them integrated into each relevant sub-unit, but I know that's not a complete list, so are there any more I need to add to learn?

(I'm resitting CHEM2 during A2, hence some AS mentions.)

Cheers!
Ca(OH)2
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username1426305
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#5
Report 5 years ago
#5
(Original post by Scitty)
Hi there,

I've been wading through AS and A2 past papers trying to compile a list of chemicals we should know, and the uses for them (e.g. in questions where they ask you to name a given structure, and suggest a use for it).

So far I've got:

MgO: AS - Magnesium Hydroxide. Anti-acid medication.
BaSO4: AS - Barium Sulphate. Its insolubility makes it useful for barium meal x-rays to evaluate the function of a patient’s digestive system.
CaOH: AS - Calcium Hydroxide. Used to adjust pH of soil and lakes.
Phenylamines: A2 - Amino group attached to a benzene ring. Used in herbicides, and as dyes and explosives.
Cl2: AS - sanitising water by reacted with H2O to form HOCl.

I find it a lot easier to learn the uses and chemicals by themselves than with them integrated into each relevant sub-unit, but I know that's not a complete list, so are there any more I need to add to learn?

(I'm resitting CHEM2 during A2, hence some AS mentions.)

Cheers!
Also, MgO is magnesium oxide, magnesium hydroxide is Mg(OH)2


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