Question

Where two liquid substances are mixed together and a solid forms by a chemical reaction, the solid is known as what?
Is it heterogeneous mixture?

The fact that paper burns and turns into different substances is known as ____ ____of paper?
I honestly am unsure of this answer, at first i thought something to do with gaseous state, but not sure.
The solid is a precipitate.
Paper burns by a process called combustion. I realize that is one word and your post makes it appear to be two words.

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