Which statement about niels bohr’s atomic model is true?
a) higher orbits have lower energies
b) each orbit has a specific energy level
c) electrons can exist in any energy level
d) orbits close to the nucleus have no energy

Option (B) is the correct answer.

Explanation:

According to Neil Bohr, mass of an atom is concentrated on the nucleus as it contains protons and neutrons whereas an electron revolves around the nucleus of the atom. He also said that the electrons reside in orbitals with different energy state.

And normally the energy level occupied by an electron is its ground state.

For example, electronic configuration of hydrogen atomis , that is, electron is present in 1s energy sub-shell.

Thus, we can conclude that the statement about Niels Bohr’s atomic model , that each orbit has a specific energy level, is true.

your picture is not part of the scientific method.

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