Answer is: coefficient is one.
Chemical reaction: SiO₂ + 4HF → SiF₄ + 2H₂O.
Reaction is balanced when there are equal numbers of elements in both side of the chemical reaction.
HF - hydrofluoric acid, <span>highly corrosive, dissolves many materials.</span>
SiF₄ - silicon tetrafluoride.
The mineral that is the hardest known substance in nature is a diamond.
Hope this helps.
Answer:
changing shape under heat and pressuremelting completely, then cooling
Explanation:
Continental crust, oceanic crust, mantle , outer core , and inner core.
