Question on both SS and chem

last SG · 2009-11-01T13:14:41+00:00

acidity is measured by the concentration of H+ or OH- in the solution so the concentration of an acid or alkali will affect acidity.SS idk, too long din take...

ItchyArmpit SG

Remember that u all study 4 types of oxides and not just acidic and basic. Do not mix up the 4 different kind of oxides and their respective properties.

yes i know.. thanks for reminding... just that i am very insecure about the acidic oxide, and basic oxide... i was actually quite confidence until my teacher contradict herself and made me confused... thanks a lot :)

ItchyArmpit SG

Hey.. i found something in my textbook.. i am not actually asking question... but there is this picture in my tb showing an Opal, below it, it writes "Opal consist of silicon dioxide, a naturally occuring acidic oxide."

dkcx SG

OK my mistake for that. Assumed SiO2 is neutral cos it doesn't react under general conditions but a check on it and it does react under more extreme conditions.

ItchyArmpit SG

OK my mistake for that. Assumed SiO2 is neutral cos it doesn't react under general conditions but a check on it and it does react under more extreme conditions.

interesting.. one more interesting thing, ice comes in 8 forms.. only one form of ice is less dense than water.. (Ice I) and is the ice which we normally use.. cool! and ice can melt at 100 degree celcius..

water is so mysterious.. kk i go continue study le haha!

forum-er93 SG

all metal oxides are basic oxides

all non-metal oxides are acidic oxides

zinc, aluminium and lead oxides are amphoteric oxides

UltimaOnline SG

To be precise, SiO2(s) doesn’t react with aqueous alkalis, but reacts only with fused/liquid/molten alkalis at high temperatures.

dkcx SG

all metal oxides are basic oxides

all non-metal oxides are acidic oxides

zinc, aluminium and lead oxides are amphoteric oxides

If u can mention Zn, Al, Pb are amphoteric, u can no longer use the word ALL metals oxides are basic oxides. Thats contridicting urself. Anyway remember there are neutral oxides as well.

qdtimes2 SG

I see!! Thanks a lot

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