The sun is mostly composed of hydrogen-1 atoms.
When two of these hydrogen-1 atoms collide, it...
The sun is mostly composed of hydrogen-1 atoms.
When two of these hydrogen-1 atoms collide, it produces no nuclear
reaction. Why?
And
How does the collision between two hydrogen-1 atoms in the sun
become a nuclear fusion reaction?
Fill in the blanks
1. the ____ atoms of the ____ groups and the hydrogen atoms
attached to the ____ atoms form ____.
(answer choices; nitrogen, carbon, a-helices or b-pleated
sheets, carbonyl, globular of firbrous structures, oxygen, amino,
random coil, thiol)
2. In the a helix, hydrogen bonds form between the ____ oxygen
atom and the ____ hydrogen atom of a peptide bond in _____. In the
B-pleasted sheet, hydrogen bonds form between the ____ oxygen atom
and the ____...
1.Two hydrogen atoms can combine to form H2 but two He atoms
cannot form He2 — Justify from MO viewpoint.
2.Ethyl benzene is treated with (i) Br2 and FeBr3 and (ii) Br2
and light or heat separately. Do you think the products will be
same? Justify your answer.
3.The double bond in cyclohexene
can be oxidized by potassium permanganate (KMNO4), whereas the
double bonds in benzene do not undergo this oxidation reaction —
Justify.
Consider two identical boxes filled with hydrogen atoms. The
atoms in Box A are illuminated by a beam of ultraviolet light,
while the atoms in Box B collide with a beam of electrons. The
light has a wavelength of 97.3 nm in vacuum. Each electron in the
electron beam has the same energy as each photon in the beam of
light.
For electrons, the potential energy levels are the difference
between the excited energy state that the atom is knocked...
Problem 3. Consider two identical boxes filled with hydrogen
atoms. The atoms in Box A are illuminated by a beam of ultraviolet
light, while the atoms in Box B collide with a beam of electrons.
The light has a wavelength of 97.3 nm in vacuum. Each electron in
the electron beam has the same energy as each photon in the beam of
light.
a) Calculate the energy of the electron beam
b) How many spectral absorption lines do you expect...
hydrogen bonds...
a) are the strongest but can be weak
b) form between two hydrogen atoms
c) involve the transfering of electrons
d) strongest bonds due to their length
e) only can be able to form between o2 atoms and H atoms
within a molecule
f) none of the above
g) all of the above
I) need more information
When two hydrogen atoms approach each other to form a chemical
bond, different interactions occur between the atoms. Identify the
correct statements with respect to the interactions involved in the
formation of chemical bond.
Check all that apply.
When two atoms of H approach each other, each electron repels the
other nucleus.
When two atoms of H approach each other, each electron is attracted
by the other nucleus.
When two atoms of H are infinitely far apart, they show attractive...
What is the frequency of the photons emitted by hydrogen atoms
when they undergo transitions from n = 5 to n = 2? Calculate in s-1
In which region of the electromagnetic spectrum does this radiation
occur?
This question relates to energy levels in the hydrogen atoms.
Calculate the energy change when an electron is promoted from
the n = 2 to the n = 9 level in a hydrogen atoms
If the electron falls back from the n = 9 to the n = 2 level,
calculate the wavelength of light corresponding to this
transition.
If the range of visible light is from 400nm to 750nm, in which
region of the electromagnetic spectrum will this emitted...
1 (a) . Show that the zero-point energy of a Debye solid
composed of N atoms is equal to 9/8NkΘD. This implies, for each
vibrational mode of the solid, a mean zero-point energy 3/8 kΘD,
that is, = 3/4 ωD.
(b)Show that, for T < θd,="" the="" quantity="">P − CV) of
a Debye solid varies as T7 and hence the ratio
(CP/CV) 1