The main difference between a square and a trapezoid is that a square has two pairs of parallel sides, while a trapezoid only has one
Answer:
C. Mole
Explanation:
Chemical formula deals with mole number
Answer:
Approximately .
Explanation:
The Lyman Series of a hydrogen atom are due to electron transitions from energy levels to the ground state where . In this case, the electron responsible for the line started at and transitioned to
A hydrogen atom contains only one electron. As a result, Bohr Model provides a good estimate of that electron's energy at different levels.
In Bohr's Model, the equation for an electron at energy level (
(note the negative sign in front of the fraction,)
where
- is a constant.
- is the atomic number of that atom. for hydrogen.
- is the energy level of that electron.
The electron that produced the line was initially at the
.
The electron would then transit to energy level . Its energy would become:
.
The energy change would be equal to
.
That would be the energy of a photon in that spectrum line. Planck constant relates the frequency of a photon to its energy:
, where
- is the energy of the photon.
- is the Planck constant.
- is the frequency of that photon.
In this case, . Hence,
.
Note that .
Answer:
the freezeng point of solution is -12°c b/c it dencity is 0.854 formula =