The frequency and energy of most energetic of these photons is
Hz and
J respectively.
The high energy photons will have least wavelength. Taking the given less wavelength for calculation of frequency and energy of photons.
λ = 2200 Å
Also, we know, 1 Å =
m
So, λ = 
λ =
<em> </em>m
Now, calculating frequency using the formula -
c = fλ, where c is speed of light, f is frequency and λ is wavelength.
We know, c =
m/s
f = c/λ
f = 
frequency =
Hz
Now, calculating Energy through the formula -
E = hf, where E is energy, h is planck's constant and f is frequency
Value of planck's constant =
Js
E =
*
Energy =
J
Thus, frequency and energy of photons is
Hz and
J respectively.
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The answer is NH4Cl!
Ionic bonding=cation + anion
- the cation ammonium (NH4) has a single electron in its valence shell, and Chlorine needs a single electron to fill its valence shell, and they stick together.
Covalent bond= involves the sharing of electron pairs between atoms
- present in Ammonium ion between Nitrogen and Hydrogen atoms
Answer:
The chemical properties are then number 2 and 4:
- It reacts with metals to form metal hydroxide and hydrogen gas.
- It decomposes to form hydrogen and oxygen.
Justification:
The chemical properties can only be observed when the substance undergoes a chemical change, which is that the substance is transformed into one or more different substances. As result of a chemical change, the composition of the former substance changes, braking some chemcial bonds and formng new ones.
The number 1 states that the water reacts with metals to form metal hydroxide, meaning that the water is transformed into a new substance, the composition will not be H₂O andy more, since the atoms will be combined with atoms of different elements. Same, can be told about the number 2, which states that hydrogen and oxygen were obtained when water decomposed.
On the other hand, the thermal conductivity of water and the boiling point (the temperature at which the water evaporates) can be measured without changing the composition of the water, so those are physical properties.