* When you cook food, you are actually causing a chemical reaction to take place. For example, when you cook meat, the proteins in the meat break down into amino acids. These amino acids are then recombined to form new proteins that have a different flavor and texture than the original meat.

* When you bake bread, the yeast in the dough ferments sugar, producing carbon dioxide. This carbon dioxide makes the dough rise and gives the bread its light and fluffy texture.

Cleaning

* When you use cleaning products, the chemicals in those products react with the dirt and grime on your surfaces, breaking them down so that they can be easily removed.

* For example, when you use a bleach-based cleaner on a laundry stain, the bleach reacts with the pigment in the stain, breaking it down so that it can be washed away.

Personal care

* The chemicals in your personal care products interact with your skin and hair to hydrate, moisturize, and style them.

* For example, the sunscreen in your lotion reacts with the sun's ultraviolet rays, absorbing them so that they do not damage your skin.

Transportation

* The gasoline that powers your car undergoes a chemical reaction when it is burned in the engine, releasing energy that powers the car forward.

* The catalytic converter in your car also uses a chemical reaction to convert harmful pollutants into less harmful gases.

Manufacturing

* Chemical reactions are used in the manufacture of a wide variety of products, from plastics to steel to pharmaceuticals.

* For example, the refining of petroleum involves a complex series of chemical reactions to separate the different components of crude oil, such as gasoline, diesel fuel, and heating oil.