Molecule lec 7
- 1. Molecules The smallest part of pure substance which can exist independently. For Example: He, N2, O2 etc In a molecule there may be one or more than one atoms
- 3. Classification of Molecules Molecule may be classified on the basis of: 1. Number of Atoms present in molecule 2. Type of Atoms present in molecule 3. Size of Atom present in molecule
- 4. 1. Number of Atoms. Mono atomic • The molecules which consist of only one atom are called Mono atomic Molecules • For example: He, Ne, Ar , etc. • Note: Only Noble gasses are Monoatomic molecules in UNIVERSE.
- 5. Di-atomic Molecules The molecules which are consist of two atoms are called di- atomic molecules For example: H2 ,O2 , N2, Cl2 etc. Molecules are formed for the sake of Compeletion duplets and octets of the atoms.
- 6. Tri-atomic Molecules • The molecules which are consist of three atoms are called tri- atomic molecules. • For example: CO2, O3, H2O etc.
- 7. Polyatomic Molecules • The molecules which are consist of many atoms are called Polyatomic molecules • For example: C6H12O6, H2SO4
- 8. Type of Atoms On the Basis of type of atoms molecules may be have two types 1. Homo-atomic 2. Hetro-atomic
- 9. Homo & Hetro Atomic Molecules The molecules which are consist of same type of atoms are called homoatomic molecules For Example H2, N2, Cl2 etc. The molecules which are consist of different type of atoms are called hetroatomic molecules For example: H2O, CO2, etc.
- 10. Micro and Macro Molecules On the basis of Size molecule may have two types 1. Micro molecules 2. Macromolecules
- 11. Micro Molecules The molecules which are small in size and have low molecular weight are called micro molecules. For example CO2, CH4, etc. All the molecules which we consider in chemistry are almost micromolecules almost
- 12. Macro Molecules The molecules which are larger in size and have high molecular weights are called macromolecules. For Example. haemoglobin, Steroids, Carbohydrates, etc. There are 10 thousand atoms in haemoglobin and it is 68 thousand times heavier than Hydrogen atom
- 13. Atomicity
- 16. Questions. What are molecules? Give examples Differentiate between micro and macro molecules What are homo and hetro molecules? Give examples. What are Mono di and tri atomic molecules? give examples of each.