Question

cfu: conservation of matter
a student mixes two clear, colorless liquids in a beaker and observes a white solid forming in the beaker. which statement correctly describes the change?
it is a physical change because no new material is formed
it is a chemical change because the formation of a precipitate indicates a chemical change
it is a physical change because the state of matter is a physical property
it is a chemical change because the change occurred immediately

Explanation:

In a chemical change, new substances are formed. The formation of a precipitate (a solid formed from a solution during a chemical reaction) indicates a chemical change. Physical changes do not result in new substances. Just because a change occurs immediately doesn't define it as chemical. The key here is the formation of a new substance (the precipitate).

Answer:

It is a chemical change because the formation of a precipitate indicates a chemical change