I need help with these questions

6. 2NH3 = N2 + 3H2

Reactant. Product

N = (1) 2. N = 2

H = (3) 6 H = (2) 6

Note: The parenthesis () means "cancel". Because I can't cancel the number in keyboard. So that I used parenthesis.

Reaction Type : Decomposition

Because the single compound has been break down into 2 product.

7. 6KOH + Co3(PO4)2 = 2K3PO4 + 3Co(OH)2

Reaction Type : Double Replacement

8. Fe3O4 + 4H2 = 3Fe + 4H2O

Reaction Type: Single Replacement

Reactant. Product

Fe = 3 Fe = 1 (3)

O = (4) 12 O = (2) 12

H = (2) 8 H = 8

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.