In a chemical reaction, bonds between atoms are broken, and atoms rearrange and form new bonds.

5. When a substance undergoes a chemical change, its physical properties also change?

Chemical or Physical change: Ice Melting

Chemical or Physical change: Two clear liquids combine and become blue

Chemical or Physical change: Sodium burns when it is placed in water

Chemical or Physical change: Crushing a soda can

Chemical or Physical change: Iron reacts with oxygen to form rust

Chemical or Physical change: Tearing Paper

Chemical or Physical change: Water boils

How would you test the chemical reactivity of iron?

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