Editing Category:Chemistry

= What is Chemistry? - Definition, Explanation, and Importance =

'''Chemistry''' is the branch of science that studies the '''composition''', '''structure''', '''properties''', and '''changes of matter'''. It helps us understand how substances interact, combine, and change to form new substances.

== Definition ==

Chemistry is the scientific study of:
* What matter is made of (elements, atoms, molecules)
* How substances behave and interact
* How new materials are formed through chemical reactions

== Word Origin ==

The word "Chemistry" comes from the Greek word '''"khemeia"''', meaning "art of transformation".

== Main Branches of Chemistry ==

1. [[Physical Chemistry]] – Studies the physical properties and behavior of chemical systems  
2. [[Organic Chemistry]] – Deals with carbon-based compounds (e.g., fuels, plastics)  
3. [[Inorganic Chemistry]] – Deals with non-carbon compounds (e.g., metals, salts)  
4. [[Analytical Chemistry]] – Involves identifying substances and their amounts  
5. [[Biochemistry]] – Studies chemicals and processes in living organisms  

== Why is Chemistry Important? ==

* It explains everyday phenomena (e.g., cooking, rusting, digestion)  
* Chemistry is essential for industries like medicine, agriculture, energy, and cosmetics  
* It helps create products such as medicines, fertilizers, soaps, plastics, and fuels  
* Chemistry improves our understanding of nature and life

== Examples in Daily Life ==

1. **Cooking food** involves chemical changes when heat breaks or forms bonds in food.  
2. **Baking soda + vinegar** → carbon dioxide gas (used in science experiments)  
3. **Rusting of iron**:  
   <math>\text{4Fe + 3O}_2 + 6H_2O \rightarrow \text{4Fe(OH)}_3</math>  
4. **Photosynthesis in plants**:  
   <math>6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2</math> (in presence of sunlight)

== Famous Chemists ==

* **Dmitri Mendeleev** – Developed the Periodic Table  
* **Marie Curie** – Discovered radioactivity  
* **Antoine Lavoisier** – Father of modern chemistry  
* **Ahmed Zewail** – Father of femtochemistry (won Nobel Prize in 1999)

== Conclusion ==

Chemistry is everywhere — in the food we eat, the air we breathe, the soap we use, and even in our bodies. It helps us understand the material world and provides the foundation for numerous scientific and technological advances.

[[Category:Chemistry]]
[[Category:Science]]
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[[Category:Grade 12]]
[[Category:STEM]]