Teflon is polytetrafluoroethylene (PTFE) polymerized from tetrafluoroethene (CF₂=CF₂). CH₂=CH₂ gives polythene; CH₂=CHCl gives PVC; CH₂=CH-C₆H₅ (styrene) gives polystyrene. The C-F bond is extremely strong, giving Teflon its chemical inertness and thermal stability.
Explanation:
The modern periodic law states that properties of elements are periodic functions of their atomic numbers (number of protons). This was established by Henry Moseley. Mendeleev's original table used atomic mass, but the modern table resolves anomalies by ordering by atomic number.
Explanation:
Red litmus turning blue indicates a basic solution, pH > 7. pH 11 is strongly basic. pH 3 and 6 are acidic (blue litmus turns red). pH 7 is neutral (litmus remains purple). Litmus is a common natural indicator.
Explanation:
A disproportionation reaction is a specific type of redox reaction where the same element in a single substance is simultaneously oxidized and reduced. In the decomposition of hydrogen peroxide (H2O2), oxygen has an oxidation state of -1. It is reduced to -2 in H2O and oxidized to 0 in O2.
No comments yet. Be the first to start the discussion!