If the item or substance has changed into a state where you are able to change it back such as:
Water melting
Water freezing
Answer:All of Earth's ocean levels rise. The moon's orbit is closer to Earth
Explanation:
its c with the older down the older it is
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.