chemical

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Chemistry is the study of matter, its features, structure, composition, and changes caused by interactions with other objects or chemical reactions.
Level enlargement:
1. Macroscopic level - Objects
2. molecular level
3. Level of atoms - protons, neutrons, and electrons
4. Subatomic Level - Electron
5. Subatomic level - Quark
6. level string
In a chemical reaction, bonds between atoms are broken and will form new substances with different characteristics. In a blast furnace, iron oxide is reacted with carbon monoxide to form iron and carbon dioxide.

Chemistry (from Arabic: كيمياء, transliteration: Kimiya = change of objects / substances or Greek: χημεία, transliteration: khemeia) is the study of the composition, structure, and properties of substances or materials from the atomic to molecular scale, and change or transformation and their interaction to form the material found everyday. Chemistry also studies understanding the properties and interactions of individual atoms in order to apply this knowledge at the macroscopic level. According to modern chemistry, physical properties are generally determined by the structure of matter at the atomic level, which in turn is determined by the style antaratom and chemical bonding.

In the field of education, chemistry is always starting to learn the Junior High School level.