* Chemical Change: A chemical change involves the breaking and forming of new chemical bonds, resulting in the creation of entirely new substances with different compositions and properties. This change is often irreversible.
Let's break it down further:
* Reactants: The original substances that undergo the chemical change.
* Products: The new substances formed as a result of the reaction.
* Different Properties: The products will have distinct physical and chemical properties compared to the reactants. This could include things like:
* Color: Iron reacting with oxygen forms rust, a reddish-brown substance.
* Odor: Baking soda reacting with vinegar produces carbon dioxide, a gas with a distinct odor.
* Flammability: Wood burning in air results in ash and gases, altering its flammability.
Examples of Chemical Changes:
* Burning wood: Wood reacts with oxygen to form ash, carbon dioxide, and water.
* Cooking an egg: The heat alters the protein structure, changing its texture and appearance.
* Rusting of iron: Iron reacts with oxygen and water to form iron oxide (rust).
Key Takeaway: Chemical changes involve the formation of new substances with different properties, indicating a fundamental change in the composition of the materials involved.
