From Wikipedia, the free encyclopedia
Jump to: navigation, search
For other uses, see Chemistry (disambiguation).
Chemistry is the science of matter, its properties, structure, composition and its changes during interactions and chemical reactions.
Levels of magnification:
1. Macroscopic level – Matter
2. Molecular level
3. Atomic level – Protons, neutrons, and electrons
4. Subatomic level – Electron
5. Subatomic level – Quarks
6. String level
During chemical reactions, bonds between atoms break and form, resulting in different substances with different properties. In a blast furnace, iron oxide, a compound, reacts with carbon monoxide to form iron, one of the chemical elements, and carbon dioxide.
Chemistry is the science of matter, especially its properties, structure, composition, behavior, reactions, interactions and the changes it undergoes.
Chemistry is sometimes called “the central science” because it connects physics with other natural sciences such as astronomy, geology and biology.
Physics also studies matter, but physics is the science of quantities of space and matter, and laws governing them. Chemistry is a branch of physical science but not a branch of physics. However, chemistry utilizes physics. For example, chemistry uses quantities like energy and entropy in relation to the spontaneity of chemical processes. It also explains the structure and properties of matter as a consequence of the physical properties of chemical substances and their interactions. For example, steel is harder than iron because its atoms are bound together in a more rigid crystalline lattice; wood burns or undergoes rapid oxidation because it can react spontaneously with oxygen in a chemical reaction above a certain temperature; sugar and salt dissolve in water because their molecular/ionic properties are such that dissolution is preferred under the ambient conditions;
The etymology of the word chemistry has been much.