INTERMOLECULAR FORCES

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   between      between molecules      covalent bond      dipole-dipole      dispersion      ery weak      extremely weak      fluor      gative      highly electronegative      hydrogen bonding      hydrogen is bonded      intermolecular      Intermolecular forces      intramolecular      low      melt at low      Melting points      Metallic      molecules are neutral      nitrogen      no      non polar      onic      oppositely charged ends      ovalent      pairs      polar      positive      shared pair      soft      strong      strong bonds      strongest      van der Waals      very strong      very weak      weak      xygen   
Intermolecular Forces

, i and c bonds are often referred as . There are also bonds that are . There are strong electrostatic forces between molecules. This is because .

There are 3 types of intermolecular forces.

They are:-
(a) forces that are and occur between molecular substances. Solids formed would be and will temperatures. Oxygen (O2), hydrogen (H2) and methane (CH4) gases are typical examples.

(b) attraction are forces which occur between molecules. Molecules will normally have which is slightly at one end and slightly ne at the other. Attraction is between the oppositely charged ends of neighbouring molecules. will be low. Hydrogen chloride (HCl) and sulphur dioxide (SO2) are typical examples.

(c) which is a special form of dipole-dipole attraction. This occurs between molecules where to the elements of , o or ine. This is the type of intermolecular forces and can be found in water (H2O), ammonia (NH3) and hydrogen fluoride (HF).

Collectively they are known as forces.

It is important to note that these forces are molecules and not the covalent forces of attraction inside a molecule.

Covalent bonding is due to forces of attraction between the of electrons and the nuclei of the atoms. These are very .

however are very weak.

So the between 2 oxygen atoms in an oxygen molecule is but the forces of attraction between 2 oxygen molecules is v. This will explain the melting and boiling point of oxygen but when boiled off the oxygen goes in because the covalent bond between the oxygen atoms are strong and not broken.

 

 

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