A student spends 4.5 hours studying for a test. How much time is this equivalent to in seconds? Select one:
a. 2,700 seconds
b. 16,200 seconds
c. 270 seconds
d. 6,480 seconds

B. 16,200

Explanation:

1) Reduce.

4.5 hours can be translated to minutes. We know there are 60 minutes in an hour.

4.5 * 60 = 270 minutes

2) Reduce further

270 minutes can then be translated to seconds using the same equation

270 * 60 = 16,200

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.