Use a scuentific calculator to do the following calculatio express each answer in scientific notation and to the overextended number of significant figures?

mg3n2 is known as magnesium nitride

explanation:

i don't think ke is an compound

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

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 solar system used to have much dust particles option no d