ScienceCâu 80 / 120
When wood burns, it turns to ash and gas. This is an example of a—
a.physical change
b.change of state
c.reversible change
d.chemical change
Giải thích
Burning is a chemical change because new substances, such as ash and gases, form and cannot easily be turned back into wood. Physical changes, like melting, do not create new substances. Chemical changes rearrange atoms into different compounds.
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