A student performs the following experiment. 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