An exothermic reaction is a reaction that releases energy through light or heat and an endothermic reaction is a reaction that absorbs heat from the surrounding environment.
More heat makes the reaction faster
Methane, Butane, Ethane, Pentane
. the energy of shells in a hydrogen atom is calculated by the formula e = -eo/n^2 where n is any integer, and eo = 2.179x10^-18 j. so, the energy of a ground state electron in hydrogen is:
e = -2.179x10^-18 j / 1^2 = -2.179x10^-21 kj
consequently, to ionize this electron would require the input of 2.179x10^-21 kj
2. the wavelength of a photon with this energy would be:
energy = hc/wavelength
wavelength = hc/energy
wavelength = 6.626x10^-34 js (2.998x10^8 m/s) / 2.179x10^-18 j = 9.116x10^-8 m
converting to nanometers gives: 91.16 nm
3. repeat the calculation in 1, but using n=5.
4. repeat the calculation in 2 using the energy calculated in 3.
i thinks its b good luck