What is the substance?
The substance refers to those materials that have both properties and characteristics that are stable and homogeneous. In this sense, it refers to the essential of something, the main composition and the most stable state.
It is important to note that chemistry makes a distinction between compounds and substances because by reacting two or more substances, a compound can be obtained.
The s simple UBSTANCES are those that have integrated under a chemical element that may appear either singly or consists of several atoms of the same substance. Generally speaking of three types of nomenclature to be able to name this type of molecules, namely:
- The formula: refers to the chemical expression.
- Functional form : name with which it is commonly handled after knowing how many atoms are used to form the minimum substance.
- Systematic form: refers to the prefix of the number of atoms.
Examples of simple substances
- Bromine, Br2, Dibromo
- Ozone, O3, Trioxygen
- Chlorine, Cl2, Dichloro
- Gold, Au, Gold
- Potassium, K, Potassium
- Fluorine, F2, Difluorine
- Iron, Fe, Iron
- Chromium, Cr, Chromium
- Sulfur, S, Sulfur
- Ozone, O3, Trioxygen
They are those substances that are formed by two atoms that make up two or more elements that are joined chemically in proportionally defined composition. In this sense, compound elements can be decomposed into simple substances since it is common for the elements that compose it to be in constant mutual interaction.
Substances are generally compound, namely:
- According to the number of elements , in this sense, they can be: binary, tertiary and quaternary.
- According to the class of elements that comprise it, they can be: organic compounds and inorganic compounds.
Examples of compound substances
- Ethyl alcohol or ethanol (CH3CH2OH or C2H6O, carbon, hydrogen and oxygen)
- Calcium sulfide (CaS, sulfur and calcium)
- Sodium bicarbonate (NaHCO3, sodium, carbon, hydrogen and oxygen)
- Hydrochloric acid (HCl, hydrogen and chlorine)
- Sulfuric acid (H2SO4, hydrogen, sulfur and oxygen)
- Water (H2O, hydrogen and oxygen)
- Chloroform (CHCl3, carbon, chlorine and hydrogen)
- Sodium oxide (Na2O, oxygen and sodium)
- Salt (NaCl, sodium and chlorine)
- Potassium bromide (KBr, bromine and potassium)
Physical properties of the substance
- State of aggregation
- Water solubility ability
- Melting temperature
- Boiling temperature