Soaps are sodium salts of long-chain fatty acids. Which part of soap dissolves in grease?
A. Water molecule
B. Sodium ion
C. Hydrocarbon tail
D. Ionic head
Answer: Option C
Solution (By JKExamLibrary)
The long non-polar hydrocarbon tail is hydrophobic and dissolves in grease/oil. The ionic head (carboxylate) is hydrophilic and interacts with water. This dual nature enables micelle formation and cleaning.
Explanation:
Teflon (PTFE) has a very low coefficient of friction and high heat resistance, making it ideal for non-stick coatings. Polystyrene is used in packaging, polyethylene in plastic bags, nylon in textiles and ropes. Teflon's monomer is tetrafluoroethene.
Explanation:
Stratospheric ozone absorbs harmful UV-B and UV-C radiation from the sun, protecting living organisms. Depletion by CFCs increases UV at surface. Infrared is absorbed by greenhouse gases.
Explanation:
The modern periodic law states that the physical and chemical properties of elements are periodic functions of their atomic numbers. This was proposed by Henry Moseley, correcting Mendeleev's periodic table which was based on atomic mass. Atomic number determines the electronic configuration and thus chemical properties.
No comments yet. Be the first to start the discussion!