Question

writing chemical formula & balancing chemical equations - slide 13
write the coefficients to balance the equations in the given boxes. write the missing reactants and/or the products on the blanks:
$square$ hcl + $square$ nh$_3$ -------> $square$ nh$_4$cl
$overline{quadquadquadquadquadquadquadquad}$ ammonia $overline{quadquadquadquadquadquadquadquad}$
$square$ pbo + $square$ c ------->$square$ pb + $square$ co
$overline{quadquadquadquadquadquadquadquad}$ carbon $overline{quadquadquadquadquadquadquadquad}$ carbon monoxide

Explanation:

Step1: Balance HCl + NH₃ → NH₄Cl

Count atoms:
Reactants: H: $1+3=4$, Cl: 1, N:1
Products: H:4, Cl:1, N:1
Atoms are balanced, so coefficients are 1,1,1.
Identify names: HCl is hydrochloric acid, NH₄Cl is ammonium chloride.

Step2: Balance PbO + C → Pb + CO

Count atoms:
Reactants: Pb:1, O:1, C:1
Products: Pb:1, O:1, C:1
Atoms are balanced, so coefficients are 1,1,1,1.
Identify name: PbO is lead(II) oxide, Pb is lead.

Answer:

1. For $\boldsymbol{HCl + NH_3

ightarrow NH_4Cl}$:
Coefficients: 1 (HCl), 1 (NH₃), 1 (NH₄Cl)
Missing names: Hydrochloric acid (HCl), Ammonium chloride (NH₄Cl)

1. For $\boldsymbol{PbO + C

ightarrow Pb + CO}$:
Coefficients: 1 (PbO), 1 (C), 1 (Pb), 1 (CO)
Missing names: Lead(II) oxide (PbO), Lead (Pb)