Which of the following is equal to 4 kilograms?
a. 4,000 g
b. 4,000 mg
c. 40 g
d. 4,000 cg

First of all, you have to compare the two instances. So if 1000g makes 1kg. Then how many grammes will make 4kg

1000g=1kg

x=4kg.

   I represented the unknown with (x)

   So you make 1 multiply x and 4 multiply 1000

1x=1000x4

1x=4000

1x is the same as x. So

x=4000g

     Which is A. Hope I helped.

the atomic mass is the bottom number on the element.

-steel jelly

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.