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3 votes
All of the following require breaking and forming chemical bonds except

rusting a nail

smashing a rock

baking a cake

burning wood

User Krad
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1 Answer

2 votes
I think it is smashing a rock. I am not 100% sure. But since it is just crushing it into smaller pieces it does not do anything chemical reaction. Hope this helps :)
User Dung Nguyen
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7.9k points
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