Question

Please check my answers on 3 questions for a chem practice packet ill give medal :)

Answer 1

@FirstFrostByte can u help

Answer 2

Sorry I don't know this.

Answer 3

oh ok

Answer 4

9 is ic 15 is oxygen and 21 is Al must be above H in th activity series

Answer 5

Are you positive
not to doubt u

Answer 6

its fine and yes because 9 I just remember 15 oxygn is the only one thats a gas and 21 is because they could not react if H were above Al in the actitivty series so the precipitate is irrelevant if they cannot react