Science第 80 / 120 题
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
解析
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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