Item SC067003: When two liquids are mixed together and a solid forms, the solid is a new substance that was formed during a chemical reaction between the two liquids.

A student mixes two different liquids together. After mixing the liquids, a solid substance forms that cannot be turned back into the starting liquids. The student claims that a chemical reaction occurred. Why is the student correct?

  1. Because a solid substance is always formed during a chemical reaction
  2. Because a new substance is always formed during a chemical reaction
  3. Because a chemical reaction always occurs when two substances are mixed together
  4. Because the products of a chemical reaction can never be turned back into the starting substances