Question

changes in matter
quiz complete
1 2 3 4 5 6 7 8 9 10
time remaining
58:42
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

Explanation:

• Step 1: The formation of yellow particles from two colorless liquids indicates a new substance is created, which is a chemical change.
• Step 2: Decantation only separates the settled particles from the liquid without altering the chemical identity of either substance, so this is a physical change.

Answer:

a chemical change in step 1 and a physical change in step 2