Step 1: She pours a colorless solution into a beaker that contains another colorless liquid. Yellow particles appear in the liquid.
Step 2: She lets the yellow particles settle in the beaker and then separates the colorless liquid by decantation.

What has most likely occurred in the beaker?
a chemical change in step 1 and a physical change in step 2
a physical change in step 1 and a chemical change in step 2
chemical changes in both step 1 and step 2
physical changes in both step 1 and step 2