Spectral lines of Hand Bohr model: A sample of hydrogen gas produces the emission lines labeled A-D, all of which result from electronic transitions down to the 2nd energy level (n=2) from higher energy levels.
Which of the following is true regarding these electronic transitions?
Emission Spectrum of Hydrogen
Аз с D
increasing wavelength
Spectral line C is due to the electronic transition from n = 6 to n =2, which is the highest energy transition
The Spectral line D is due to the electronic transition from n = 3 to n=2, and it is the transition with the lowest frequency compared to the other transitions.
The frequency of the spectral line due to the electronic transition from n = 5 to n=2 is lower than the electronic transition from n= 4 to n=2.
All of these transitions are in the Infrared region of the electromagnetic spectrum
A Moving to the next question prevents changes to this answer.
hmed, Ikram ...pdf

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

0.88m hope i am correct : )

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.