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SUBSTANCES

Pure subtances

chemical compunds

mixtures

a pure substance is anything composed of a single type of material. In other words, it is free of contaminants. So, in addition to elements, compounds, and alloys, a pure substance might include honey, even though it consists of many different types of molecules.

Water

Diamond

Gold

Table salt

Ethanol

Brass

Bronze

Saline solution

A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds. A molecule consisting of atoms of only one element is therefore not a compound.

C 2 H 6 O: Alcohol. NaCl: sal. C _ { 2} H _ { 6} O: Etanol. C 2 H 4 O 2 :

Vinagre. NH 3 : Amoníaco. C 2 H 4 O 2 : Ácido acético. C 4 H 10 : Butano.

H 2 SO 4 : Ácido sulfúrico. CH 4 :

Metano .

C _ { 12} H _ { 22} O _ { 11} : sacarosa. C 3 H 8 : propano.

NaHCO 3 : Bicarbonato de Soda .

N 2 O: nitrógeno. C 6 H 8 O 7 : Ácido cítrico. C 8 H 18 : Octano. C 10 H 16 O: alcanfor.

A mixture is a substance made by combining two or more different materials in such a way that no chemical reaction occurs. A mixture can usually be separated back into its original components.