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WorksheetsChemistry ( Quantum Theory and the Atom ) lesson 1
Total questions: 48
Worksheet time: 31mins
Why we need Bohr’s model ?
To understand the relationship among the atomic structure
To understand the relationship between electron and protons
To understand the elements in the periodic table
To understand the difference between ground and exited state
Define Bohr’s atomic number
Bohr’s model also correctly predicted the frequencies of the lines in hydrogen atomic emission spectrum
Bohr’s model also correctly predicted the frequencies of the lines in lithium atomic emission spectrum
Bohr’s model also correctly predicted the frequencies of the lines in oxygen atomic emission spectrum
To understand the relationship between atomic structures
What is an example of bohr’s model ?
Combare between ground state and exited state
The difference between ground state and exited state is that the ground state is the lowest energy level and the exited state is when an electron gain energy so it moves to higher energy state
The difference between ground state and exited state is that the exited state is the lowest energy level and the ground state is when an electron gain energy so it moves to higher energy state
Combare between the orbit radius and relative energy
If the orbit radius was big then the relative energy will be large
And if the orbit radius was smaller then the relative energy would be small
If the orbit radius was big then the relative energy will be small
And if the orbit radius was smaller then the relative energy would be big
If the orbit radius was small then the relative energy will be large
And if the orbit radius was bigger then the relative energy would be smaller
If the orbit radius was big then the relative energy will be large
And if the orbit radius was smaller then the relative energy would be bigger
How to calculate the relative energy
We multiply the number by 2
We multiply the number by itself
We divide the number by itself
We multiply the number by 7
What is emitted when the electron drops from a higher level to a lower level
Photon
Lyman
Balmar
Paschen
Name the series of spectral lines formed when electrons are dropping to n:1
Lyman
Balmar
Paschen
Name the series of spectral lines formed when electrons are dropping to n:2
Lyman
Balmar
Paschen
Name the series of spectral lines formed when electrons are dropping to n:3
Lyman
Balmar
Paschen
Balmar series of spectral lines are formed in ————— region
Visible series
Infraed series
ultraviolet series
Lyman series of spectral lines are formed in ————— region
Ultraviolet series
Visible series
Infraed series
Paschen series of spectral lines are formed in ————— region
Visible series
Infraed series
Ultraviolet series
Explain why different colors of light result from electron behavior in the atom
Electron transition from higher energy orbits to the second orbit account for all of hydrogens visiable lines , which form balmar series
different colors of light result from electron behavior in atoms because electrons can only exist at specific energy levels and transitions between these levels lead to the emission or absorption of photons with distinct wavelengths, which our eyes perceive as different colors.
How can we calculate the energy of photon
(a)
What are the limits of bohr’s model
Bohr model explained the hydrogen spectral lines but failed to explain any other elements line
Did not fully account for the chemical behavior of atoms
Later experiments demonstrated that bohr model was fundamentally incorrect
Bohr model explained the hydrogen spectral lines and succeeded to explain any other elements line
electron was on n: 3 before it gained energy and went to n: 8 but then it lost energy and went to n:2
True
False
If an electron is in excited state so it gains energy and it goes to a high level it can never go back to it’s original level
True
False
What is an quantum number
Number : 1,2,3,4,5,6,7,etc
n: a number
First , second, third , fourth, fifth
The smaller the electron orbit the lower the energy is
The bigger the electron orbit the more the energy is
True
False
Whar is bohr postulates ?
When electron absorbs energy, it will move from ground state to exited state
The exited state is stable , and the electron won’t lose energy and fall back to the ground state
The exited state is unstable , and the electron will lose energy and fall back to the ground state
These energy will be radiated as light
The light emitted with discrete amount of energy is called photon
Bohr suggested that electron moves around the nucleus only in certain allowed ——— orbit
(a)
Bohr correctly predicted the frequency lines in hydrogen atomic emission spectrum
True
False
What is the lowest level called?
(a)
When an atom gains energy, it is in an
(a)
Why did te quantum mechanics scientist started to explain the atom model and how the electrons are arranged?
Bohr model was incomplete
Bohr model was incorrect
Bohr model missed some things
Louis de broglie hypothiesised that particales , including electrons , could have a ———— behavior
Wavelike
Sunlike
Moonlike
Planetlike
Electron orbit the nucleus only in whole numbers wavelengths
De broglie equations
What is the letter before the = represent
wavelength
Mass
Velocity
Planks constant
What is the letter h represnt in de broglie equation
Planck constant
Wavelengths
Mass
Velocity
What is the letter m represent in the de broglie equation
Mass
Velocity
Wavelengths
Plancks constant
What is the letter v represent in the de broglie equation
Mass
Velocity
Wavelengths
Plancks constant
Heisenberg uncertainty principle proposed on
Impossible to know precisely both velocity and position of a particale at the same time
It’s possible to know both velocity and position
What is the only thing that can be known in the heispreng principle?
Is the probability for an electron to occupy a certain region around the nucleus
Both velocity and position
Explain the photo
Heisenberg uncertainty principle is
Fundamentally impossible to know precisely both velocity and position at the same time
حفظوا الي فوق
Its impossible to take any measurements of an object without disturbing the object
True
False
What happens when photon collids with electrons?
The electron will move to a higher level and the position with change too so the velocity and position can’t be determined at the same time
…
Schrodinger treated electrons as waves in a model called
Quantum mechanical model of the atom
Quantum number
Quantum mechanics number
Schrodinger equation applied only to ?
Hydrogen
Hydrogen and only the first three periods
Hydrogen and all the other elements
The difference between a 3d and a 2d Region?
Orbital : probable area of finding the destiny of electron in a atom
Orbit : fixed path on which electron revolve around the nucleus
Orbit: probable area of finding the destiny of electron in a atom
Orbital : fixed path on which electron revolve around the nucleus
Schrodinger made a wave equation, each solution to the equation is known as a wave function, which is related to the probability of finding the electron within a particular volume of space arounf the nucleus
.
Atomic orbitals
.
n is a principal quantum number the indicates the size and energy of atomic orbitals
Number : is a principal quantum number the indicates the size and energy of atomic orbitals
principle energy level is where the electron revolves around
Energy sublevels
n = 4 ( n is the energy sublevel )
n = 4 ( 4 is the energy sublevel)
n = 2 ( n is the energy sublevel )
n = 2 ( 2 is the energy sublevell )
Orbitals are the area where the probability of finding electrons is maximum
spdf
…
…
Which atomic suborbital have a dumbbell shape?
S
P
D
F
Who proposed that particales could also exhibit wavelike behavior
Bohr
Eingestiegen
Rutherford
De broglie
