Chemical Changes

A process where one or more new substances are formed, often accompanied by energy changes.

A change that affects one or more physical properties of a substance without altering its chemical composition.

Iron rusting is an example of a chemical change.

Temperature change can indicate a chemical change.

Change in color and production of gas bubbles are signs of a chemical reaction.

Melting ice is a physical change.

New substances are created, and the original substances can no longer be identified.

A reaction that absorbs heat from its surroundings.

A reaction that releases heat to its surroundings.

In a chemical reaction, mass is neither created nor destroyed; it is conserved.