__mg + __fe2o3 -> __mgo + __fe

balance the chemical equation.

a). 1, 2, 1, 2
b). 1, 1, 3, 1
c). 3, 1, 3, 2
d). 2, 3, 2, 3

the right answer is C). 3, 1, 3, 2

1,2,1,2 was incorrect

Explanation: USA testprep

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.

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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