IJMB IJMB: VERIFIED 100% CHEMISTRY QUESTIONS AND ANSWERS
*IJMB NUMBER 12 SOLUTION*
12BI). Allotropy, the existence of a chemical element in two or more forms, which may differ in the arrangement of atoms in crystalline solids or in the occurrence of molecules that contain different numbers of atoms. It may be monotropic, in which case one of the forms is the most stable under all conditions…
12biii.. *GRAPHITE* conduct good electricity while *DIAMOND* can not conduct electricity…
12biv. *POINT TO BACK UP THE ARGUMENT*
Diamond is insoluble in water. It does not conduct electricity. Every atom in a diamond is bonded to its neighbours by four strong covalent bonds, leaving no free electrons and no ions. This explains why diamond does not conduct electricity.
Graphite is insoluble in water. It has a high melting point and is a good conductor of electricity, which makes it a suitable material for the electrodes needed in electrolysis.
Each carbon atom is bonded into its layer with three strong covalent bonds. This leaves each atom with a spare electron, which together form a delocalised ‘sea’ of electrons loosely bonding the layers together. These delocalised electrons can all move along together – making graphite a good electrical conductor.
Isotope, one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties.