Explain in detail :-
working of a rain guage
working of a mercury barometer

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

The rate constant for the reaction below is 6.2 x 10−5 mol l−1 s −1. if the initial concentration of a is 0.0500 m, what is its concentration after 115 s?