Question

1. _ag + _f₂ → ___agf
2. _k₂s + _sr(clo₃)₂ → _kclo₃ + _srs
3. _na + _znco₃ → _na₂co₃ + _zn

Explanation:

Step1: Balance equation 15: Ag + F₂ → AgF

First balance F: There are 2 F on left, so add coefficient 2 to AgF.
$\text{Ag} + \text{F}_2
ightarrow 2\text{AgF}$
Now balance Ag: There are 2 Ag on right, so add coefficient 2 to Ag.
$2\text{Ag} + \text{F}_2
ightarrow 2\text{AgF}$

Step2: Balance equation 16: K₂S + Sr(ClO₃)₂ → KClO₃ + SrS

Balance K: 2 K on left, add coefficient 2 to KClO₃.
$\text{K}_2\text{S} + \text{Sr(ClO}_3\text{)}_2
ightarrow 2\text{KClO}_3 + \text{SrS}$
All other atoms (S, Sr, Cl, O) are now balanced.

Step3: Balance equation 17: Na + ZnCO₃ → Na₂CO₃ + Zn

Balance Na: 2 Na on right, add coefficient 2 to Na.
$2\text{Na} + \text{ZnCO}_3
ightarrow \text{Na}_2\text{CO}_3 + \text{Zn}$
All other atoms (Zn, C, O) are now balanced.

Answer:

1. $2\text{Ag} + \text{F}_2

ightarrow 2\text{AgF}$

1. $\text{K}_2\text{S} + \text{Sr(ClO}_3\text{)}_2

ightarrow 2\text{KClO}_3 + \text{SrS}$

1. $2\text{Na} + \text{ZnCO}_3

ightarrow \text{Na}_2\text{CO}_3 + \text{Zn}$