Why does the moon appear to move across the sky at night? It travels around the earth everyday.
All objects are moving in space.
The earth rotates on its axis.

i think it is rotation on axis

Explanation: It is the rotation of Earth that makes them seem to appear to be moving across the sky. As Earth rotates, causing night and day, it also takes a long journey around the sun. This yearly journey is called a revolution. This revolution takes 365 days, or one year.

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.