Question

balancing equations practice
part a: identify the following parts of each chemical formula by circling the subscripts and drawing a square around the coefficients.
h₂ 2 hcl 4 o₂ ch₄ 3 co₃ 2 naoh

Explanation:

Step1: Analyze $H_2$

Coefficient is 1 (not written, assumed), sub - script of H is 2.

Step2: Analyze $2HCl$

Square around 2 (coefficient), circle 1 (sub - script of H) and 1 (sub - script of Cl).

Step3: Analyze $4O_2$

Square around 4 (coefficient), circle 2 (sub - script of O).

Step4: Analyze $CH_4$

Coefficient is 1 (not written, assumed), circle 4 (sub - script of H), 1 (sub - script of C) is not written but assumed.

Step5: Analyze $3CO_3$

Square around 3 (coefficient), circle 3 (sub - script of O), 1 (sub - script of C) is not written but assumed.

Step6: Analyze $2NaOH$

Square around 2 (coefficient), circle 1 (sub - script of Na), 1 (sub - script of O), 1 (sub - script of H).

Answer:

For $H_2$: coefficient 1, sub - script of H is 2; for $2HCl$: coefficient 2, sub - script of H is 1 and Cl is 1; for $4O_2$: coefficient 4, sub - script of O is 2; for $CH_4$: coefficient 1, sub - script of H is 4, C is 1; for $3CO_3$: coefficient 3, sub - script of O is 3, C is 1; for $2NaOH$: coefficient 2, sub - script of Na is 1, O is 1, H is 1.