Chemical Reactions Unit Test

To determine how many atoms are in the products of the reaction between one molecule of bromine (Br2) and two molecules of potassium chloride (KCl), we first break down the reactants:

• 1 molecule of Br2 contains 2 bromine (Br) atoms.
• 2 molecules of KCl each contain 1 potassium (K) atom and 1 chlorine (Cl) atom.

Calculating the total number of atoms:

• From 1 molecule of Br2: 2 Br atoms
• From 2 molecules of KCl: 2 K atoms + 2 Cl atoms = 4 atoms (2 K + 2 Cl)

Now adding them together:

• Total = 2 (Br) + 2 (K) + 2 (Cl) = 6 atoms

Thus, the total number of atoms in the products is six.

So the correct response is: six.