188k views
2 votes
What do these changes have in common? :

using a large magnet to remove pieces of iron from a junkyard, crushing a mineral into powder
Select all that apply
1)both conserve mass
2)both are caused by cooling
3)both are caused by heating
4)both are only physical changes

1 Answer

4 votes
4, because you are not altering the chemical makeup of the substances by doing these things. Hopes this helps! :)
User Mehdi Maghrouni
by
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