Question

1. in the previous reaction, the subscripts used to write the formula of the product, fe₂o₃, were determined by watching observing the particles in the video. can we determine a chemical formula without an animation? yes! when the product of a combination reaction is an ionic compound, we use known ion charges to determine the correct subscripts used to write the chemical formula of the product. 8. build the formula for the ionic compound containing aluminum and iodine.

Explanation:

Step1: Determine ion charges

Aluminum forms $Al^{3 + }$ ion and iodine forms $I^{-}$ ion.

Step2: Balance charges

To balance the charges in an ionic compound, we need 3 iodine ions for 1 aluminum ion.

Answer:

$AlI_{3}$