Calculate the energy of a photon in the Balmer series that results from the transition n = 3 to n = 2. What is the region of the electromagnetic spectrum? The Rydberg constant equals 2.180 ´ 10 -18 J.

What does the symbol (–hfus) indicate in a phase change?

Why is any chemical reaction always balanced? give reasons and explain the easiest way to solve the balancing problems in chemical equations with stoichiometric coefficients upto 20 as hit and trial doesn't always work. give full reasoning

An object of mass 10.0 kg and volume 1000 ml and density 10 g/ml sinks in water who’s density is 1.0 g/ml. what is the mass of the water which has been displaced in kilograms