Sugar is used for energy by almost all organisms on earth. in cells, sugar combines with oxygen and forms carbon dioxide and water.

when sugar combines with oxygen to form these products, is it a physical or a chemical change, and why?

1.)a physical change, because oxygen is involved in the change
.)a physical change, because the atoms that make up sugar rearrange to form the products
3.)a chemical change, because oxygen is involved in the change
4.)a chemical change, because the atoms that make up sugar rearrange to form the products

Explanation:

When sugar combines with oxygen to form carbon dioxide and water, it is a chemical reaction. The carbon and hydrogen molecules in sugar re-arrange to join with oxygen to form carbon dioxide and water.

So the answer is 4.)a chemical change, because the atoms that make up sugar rearrange to form the products.

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.