Molecule. the smallest particle of a substance that can exhibit all the chemical properties of the substance. A molecule is composed of atoms (more precisely, of atomic nuclei, their surrounding inner electrons, and their outer valence electrons, which form a chemical bond). The inner electrons of atoms usually do not participate in the formation of such bonds. The molecular composition and structure of a given substance do not depend on the method of preparation used. In the case of monatomic molecules (for example, inert gases), the concepts of the molecule and the atom are congruent.
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1 You can download eChem here: http://www.investigationstation.org/sciencelaboratory/echem/download.html. 2  Molecules tend to fall into 4 broad categories: 3  Small molecules. 4  These molecules consist of a small number of atoms strongly bonded together.
http://chemsite.lsrhs.net/ChemicalBonds/molecularSubstances.html
1 When two or more atoms are bonded together with covalent bonds a molecule is formed. 2  Molecules are primarily formed from the nonmetal elements. 3  See the illustration below: 4  Using a piece of software called eChem you can experiment with how various nonmetal atoms will bond covalently to form molecules.
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The physical properties of molecular substances Molecules are made of fixed numbers of atoms joined together by covalent bonds, and can range from the very small (even down to single atoms, as in the noble gases) to the very large (as in polymers, proteins or even DNA).
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Melting and boiling points Molecular substances tend to be gases, liquids or low melting point solids, because the intermolecular forces of attraction are comparatively weak. You don't have to break any covalent bonds in order to melt or boil a molecular substance.
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Solubility in organic solvents. Molecular substances are often soluble in organic solvents-which are themselves molecular. Both the solute (the substance which is dissolving) and the solvent are likely to have molecules attracted to each other by van der Waals forces.
http://chemguide.co.uk/atoms/structures/molecular.html
(mŏl`əkyo͞ol) [New Lat.,=little mass], smallest particle of a compound compound,in chemistry, a substance composed of atoms of two or more elements in chemical combination, occurring in a fixed, definite proportion and arranged in a fixed, definite structure.
http://encyclopedia2.thefreedictionary.com/molecule
1 Molecules tend to fall into 4 broad categories: 2  Small molecules. 3  These molecules consist of a small number of atoms strongly bonded together. 4  Most room temperature liquids, and gasses consist of small molecules.
http://chemsite.lsrhs.net/ChemicalBonds/molecularSubstances.html
Answers. Best Answer: A molecular compound, as opposed to an ionic substance, is a pure substance that is formed from nonmetals. It has a fairly low melting point, and can only conduct electricity unless it is aqueous and polar. Another important difference between the two is that an ionic compound is a crystalline solid at standard temperature and pressure (STP), whereas a molecular compound can be in a solid, gas or liquid state at STP. Source(s): groma · 6 years ago.
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1 Using a piece of software called eChem you can experiment with how various nonmetal atoms will bond covalently to form molecules. 2  You can download eChem here: http://www.investigationstation.org/sciencelaboratory/echem/download.html. 3  Molecules tend to fall into 4 broad categories: 4  Small molecules.
http://chemsite.lsrhs.net/ChemicalBonds/molecularSubstances.html
molecular substance definition
Molecular Substance is defined as, when two or more atoms are bonded together with covalent bonds a molecule is formed.