What is a physical change? What is a chemical change? Provide two examples of each.

physical change is the temporary and reversible change in which no substance is formed.

eg - melting of ice, tearing paper into pieces, etc.

Chemical change is the permanent change in which new substance having different chemical properties are formed.

eg - burning of firewood, Rusting of iron, etc.

b) mutualism

hope this : )

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.