April 5, 2013

Ammonia Clock

Ammonia is a chemical of great industrial importance as it is used in making the nitrogen based fertilizers. Its demand is so high that when Haber who developed the synthesis of ammonia by combining nitrogen and hydrogen using catalytic method, he was awarded Nobel prize. Here we will discuss its peculiar structure. Nitrogen is the central atom to which 3 hydrogen atoms are attached. But due to sp2 hybridized bonds it is not flat but trigonal prism. A pair of electrons resides on the nitrogen giving it basicity. The ammonia molecule readily undergoes nitrogen inversion at room temperature like an… Read More »Ammonia Clock

Carbon Dating

There are atoms which have same chemical properties but different atomic weights. They have same atomic mass because number of protons are identical but additional neutrons make then different in weight. Such atoms are called isotopes. For example carbon which has 6 protons and 6 neutrons have an isotope which have 6 protons but 8 neutrons.¬† They are presented as C14 and C12. Addition of protons make them less stable and many of them are radioactive. The rate at which a particular atom decays is independent of temperature, light or darkness. During decay the atom is trying to achieve state… Read More »Carbon Dating

Train Journey from Delhi to Dehradun

It is the beginning of the month of April and Delhi has already become hot. The weather in India changes every 3 months. It is the spring season and soon sweltering heat will envelope North India. Dehradun which is situated in a valley between Lower Himalaya and Shivalik hills named after Lord Shiva. We boarded the train from New Delhi Railway station at 06 hrs and 50 minutes and it is all sitting on chair cars. Due to being an AC train, it is closed with glass panes. Soon we were hurtling through the vast plains of North India. The… Read More »Train Journey from Delhi to Dehradun