Changes that reorder atoms to form new molecules, such as the reaction between sodium and chlorine ions to form sodium chloride, are known as

A physical change doesnot change the chemical composition of elements or molecules involved. While a chemical change involves the formation of a new molecule or a compound from reacting species. This leads to an alteration in the chemical composition of the substance. Chemical changes influence both physical and chemical properties of the substances undergoing the change. In this type of change, atoms rearrange to form new compounds.

Therefore, the correct answer is Chemical change.

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).