Can someone help me with some chemistry questions?

Carter C

New member
Why are polyatomic ions called polyatomic ions?
How do polyatomic ions get charges like -1 charge, -2 charge, -3 charge and +1 charge?
Can someone remind me how gram formula mass works?
What does it mean if something is "covalent?"
How do you identify a combustion reaction?

Thank you for helping if you can.
 
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