Question

determine whether or not the equation is balanced or not and write a \b\ for balanced and a \u\ for unbalanced

1. ch₄ + o₂ → co₂ + 2h₂o
2. ag₂o → ag + o₂
3. nabr + caf₂ → naf + cabr₂
4. 2na + 2h₂o → 2naoh + h₂
5. 4p + 5o₂ → 2p₂o₅
6. kclo₃ → kcl + o₂
7. 4fe + 3o₂ → 2fe₂o₃
8. sno₂ + 2h₂ → sn + 2h₂o

Explanation:

Step1: Check carbon, hydrogen and oxygen atoms in equation 1

On left - hand side: 1 C, 4 H, 2 O. On right - hand side: 1 C, 4 H, 4 O. Unbalanced.

Step2: Check silver and oxygen atoms in equation 2

On left - hand side: 2 Ag, 1 O. On right - hand side: 1 Ag, 2 O. Unbalanced.

Step3: Check sodium, bromine, calcium and fluorine atoms in equation 3

On left - hand side: 1 Na, 1 Br, 1 Ca, 2 F. On right - hand side: 1 Na, 1 F, 1 Ca, 2 Br. Unbalanced.

Step4: Check sodium, hydrogen and oxygen atoms in equation 4

On left - hand side: 2 Na, 4 H, 2 O. On right - hand side: 2 Na, 4 H, 2 O. Balanced.

Step5: Check phosphorus and oxygen atoms in equation 5

On left - hand side: 4 P, 10 O. On right - hand side: 4 P, 10 O. Balanced.

Step6: Check potassium, chlorine and oxygen atoms in equation 6

On left - hand side: 1 K, 1 Cl, 3 O. On right - hand side: 1 K, 1 Cl, 2 O. Unbalanced.

Step7: Check iron and oxygen atoms in equation 7

On left - hand side: 4 Fe, 6 O. On right - hand side: 4 Fe, 6 O. Balanced.

Step8: Check tin, oxygen and hydrogen atoms in equation 8

On left - hand side: 1 Sn, 2 O, 4 H. On right - hand side: 1 Sn, 2 O, 4 H. Balanced.

Answer:

1. U
2. U
3. U
4. B
5. B
6. U
7. B
8. B