The answer to this is B, solids with a repeating atomic pattern.
The two substances have different densities. Density can be affected by the temperature of a substance. Since they have to same volume but weigh differently, they have different densities. Remember, density = mass/volume
ANSWER
<em>2Ba + 2HBr → 2BaBr + H2</em>
<em>2BiCl3 + 3H2S → Bi2S3 + 6HCl</em>
<em>Br2 + 2KI → I2 + 2KBr</em>
<em>4Fe + 3O2 → 2Fe2O3</em>
<h3>
I HOPE THIS WILL HELP YOU IF NOT THEN SORRY HAVE A GREAT DAY:)</h3>