Chemistry is the study of chemical reactions and properties of matter. All the principles in chemistry are based on what we know about physics. As you can see, science topics build on each other, like a pyramid. Chemistry involves how atoms, the smallest particles of the world, bind together to create compounds. Although this might seem minor, chemistry is responsible for nearly any household product you use. Hair care products, cleaning products, even the packaged foods you eat, are all based in chemistrychemistry