Answer:
Copper turns green on exposure to air
Explanation:
Liquid water freezes to form ice: Physical change
Reason: Water can melt back when it becomes ice.
Copper turns green on exposure to air: Chemical change
Reason: The copper can not change back from the green state when it turns green.
Answer: P2O5
Explanation: You divide both subscripts by 2 to get the empirical formula.
Answer:
they all reacted the same
Explanation: