What is chemistry?
Chemistry It is science that studies matter and its transformations. It also studies the energy that is involved in these transformations.
Chemistry is very linked to our daily lives. It is present in food, medicine, buildings, plants, clothing, fuels.
Everything in the universe is made up of chemistry. In our body, several chemical transformations also occur.
Matter and substance
Matter It is everything that has mass and occupies space. Anything that has physical or real existence is matter.
Everything in the known universe manifests as matter or energy. The matter may be liquid, solid or gaseous. Examples of this are paper, wood, air, water, stone.
Analyzing matter qualitatively (quality), we call it substance.
Substance - has a characteristic, determined composition and a defined set of properties.
It can be simple (formed by only one chemical element) or compound (formed by several chemical elements).
Examples of simple substances: gold, mercury, iron, zinc.
Examples of compound substances: water, sugar (sucrose), table salt (sodium chloride).
Chemicals can be classified in two ways: by the type of bond that forms them and by the number of chemicals participating in the bond.