ScienceCâu 69 / 120
Which of the following is an example of a chemical change?
a.Melting ice
b.Cutting paper
c.Rusting iron
d.Boiling water
Giải thích
Rusting iron forms a new substance (iron oxide), making it a chemical change. Melting, cutting, and boiling are physical changes that do not alter chemical composition.
Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
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