* Chemical Change Definition: A chemical change involves the formation of new substances with different chemical properties. This is often accompanied by observable changes like:
* Temperature change: Heat is either absorbed or released during the formation of new substances.
* Color change: The new substances have different colors.
* Gas production: Bubbles indicate the release of a gas.
* Precipitate formation: A solid forms from the solution.
* Drain Cleaner Reaction: Drain cleaners typically contain strong bases like sodium hydroxide (NaOH). When mixed with water, these bases react with the water molecules, releasing heat (exothermic reaction). This reaction breaks down the drain cleaner and water molecules, forming new substances like sodium ions (Na+), hydroxide ions (OH-), and potentially other compounds.
In summary: The warming of the solution is a sign that the drain cleaner is reacting chemically with water to create new substances, making it a chemical change.
