Question

4 multiple choice 1 point which of the following chemical equations is balanced correctly? na + cl₂ ---> nacl 2k + mgbr₂ ---> 2kbr + mg 3h₂o + o₂ ---> 3h₂o₂ zn + 2cuso₄ ---> 2cu + znso₄

Explanation:

Step1: Check first equation

Count atoms: Left has 1 Na, 2 Cl; Right has 1 Na, 1 Cl. Unbalanced.

Step2: Check second equation

Count atoms: Left has 2 K, 1 Mg, 2 Br; Right has 2 K, 2 Br, 1 Mg. Balanced.

Step3: Verify remaining equations

Third: Left has 6 H, 8 O; Right has 6 H, 6 O. Unbalanced.
Fourth: Left has 1 Zn, 2 Cu, 2 S, 8 O; Right has 2 Cu, 1 Zn, 1 S, 4 O. Unbalanced.

Answer:

B. $2K + MgBr_2
ightarrow 2KBr + Mg$