Answer:
the answer is A because the rest wouldnt go good with the work
Explanation:
I’m not really sure but i think it’s 2.
Answer: 
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The balanced chemical equation for showing hydrogen peroxide decomposing into hydrogen and oxygen is:

Rock formed by heat and pressure
Answer:
Mn
Explanation: 4th shell so 4th row and count 7 from the left most column