Method to distinguish SiO2 and CaCO3

[Janiceleong26]

Homework Statement

I chose D, because since SiO2 is an acidic oxide whereas CaCO3 is neutral. But the correct answer is C. And i have doubts on option A and B too.. I can't seem to see why are they not right.. For A, I thought a neutralisarion reaction will happen with SiO2? And for B, I thought CaCO3 decomposes? Please help, thanks

 

[Borek]

Have you ever tried to dissolve SiO₂ in a base? Have you ever tried to dissolve it in water?

Roasting and gentle heating are two different things.

 

[Janiceleong26]

Have you ever tried to dissolve SiO₂ in a base? Have you ever tried to dissolve it in water?

Roasting and gentle heating are two different things.

No, I haven't..

I see, so if we were to gentle heat them, do they melt?

 

[Borek]

That was a rhetoric question. You are expected to know some basic properties of the substances from the curriculum.

Check melting points in wikipedia. Actually the best thing you can do is to read about properties of both compounds in some textbook.

 

[Janiceleong26]

That was a rhetoric question. You are expected to know some basic properties of the substances from the curriculum.

Check melting points in wikipedia. Actually the best thing you can do is to read about properties of both compounds in some textbook.

Ok thanks