Cl₂ + KI → KCl + I₂

Here's how to balance it:

1. Count the atoms on each side:

- Reactants:

- Cl: 2

- K: 1

- I: 1

- Products:

- Cl: 1

- K: 1

- I: 2

2. Balance the halogens (Cl and I):

- Put a coefficient of 2 in front of KCl on the product side. This balances the Cl atoms and also balances the K atoms.

- The reaction now looks like this:

Cl₂ + KI → 2KCl + I₂

The balanced chemical equation is:

Cl₂ + 2KI → 2KCl + I₂