A number of substances and their chemical formulas are listed below. Check the ones that are compounds.
Brass is a combination of a number of elements. Its exact composition can vary.
Pass a magnet over the mixture to remove the steel.
1 Pass a magnet over the mixture to remove the steel.
Add water to the sand/salt mixture and stir to dissolve the salt.
2 Add water to the sand/salt mixture and stir to dissolve the salt.
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