Ann propped up a graham cracker in a shallow bowl. she then set up an electric fan to blow on the graham cracker at three different speeds. what is anns dependent variable in this experiment?

Graham cracker

Explanation:

An independent variable can be changed, altered and manipulated in an experiment to determine the effect of this on the dependent variable. The dependent variable or experimental variable undergoes changes due to the effective changes in the independent variable.

In the given situation, the electric fan three different speeds is the independent variable whose effect is to be determined on the graham cracker, which is a dependent variable.  

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.