NEW
Font size
WorksheetsUnit 2 & 3 Review
Total questions: 46
Worksheet time: 56mins
Scientists are consistently building on each other’s models. What did Bohr add to the model of the atom?
That atoms are solid structures and simple building blocks.
That atoms have protons and electrons stuck together.
That atoms have orbiting electrons that can jump energy levels.
That there is an electron cloud around a nucleus.
Which scientist bombarded gold sheets with alpha particles to look at the atom?
Rutherford
Bohr
Einstein
Planck
Which model of the atom was used as a result of J.J. Thomson's cathode ray experiments?
Plum pudding model
Nuclear model
Planetary model
Quantum mechanical model
Which model of the atom is based on the mathematical probability of finding the location of an electron?
Plum pudding model
Nuclear model
Planetary model
Quantum mechanical model
Around the turn of the twentieth century, English physicist J. J. Thomson discovered that cathode rays are streams of negatively charged particles. Because he was able to produce cathode rays using various kinds of metals, Thomson concluded that all atoms must contain these negatively charged particles. From this discovery, to what ultimate conclusion regarding the structure of the atom did Thomson then come?
The negatively charged particles found in cathode rays normally orbit the nucleus of the atom.
The number and arrangement of negatively charged particles in an atom are what give it its chemical properties.
The mass of a negatively charged particle is so small that the atom must also consist of protons and neutrons.
The atom must contain some positive charge as well as negatively charged particles because an atom is electrically neutral.
Ernest Rutherford bombarded a piece of gold foil with alpha particles. He found that most particles passed through the foil. However, a very small percentage of the particles were deflected back toward their source. Which of the following best describes Rutherford's discovery?
Gold atoms repel alpha particles.
A gold atom is mostly empty space.
Gold atoms emit alpha particles.
Gold atoms are spherical in shape.
Which of the following is NOT a postulate in Dalton's atomic theory?
I. All matter consists of divisible particles called atoms.
II. Atoms of the same element are identical in mass and properties.
III. Atoms cannot be created or destroyed.
IV. Compounds are formed by a combination of two or more different kinds of atoms.
I
II
III
IV
The model of an atom is consistently undergoing changes. These changes are based on new information being found. Which model had the protons and the neutrons of the atom in the middle with the electrons orbiting around them with the ability to jump energy levels?
Rutherford Model
Planck Model
Bohr Model
Quantum Model
Which model was developed after alpha particles were bombarded onto sheets of gold?
Rutherford Model
Planck Model
Bohr Model
Quantum Model
Which of the following would change the current theory of the atom?
electrons found on an 8th energy level
a carbon atom being discovered with 12 neutrons
a new subatomic particle is discovered
a new element is discovered
The model of an atom is consistently undergoing changes. These changes are based on new information being found. Which model has the electrons in multiple orbital paths going around the nucleus of the atom?
Rutherford Model
Planck Model
Bohr Model
Quantum Model
The energy level of an electron is most closely related to its —
charge
mass
position
size
Valence bond theory and molecular orbital theory together determine how and why elements form compounds. Recent discoveries in Canada have new evidence showing that hydrogen has a different role in bonding than scientists predicted previously. If the research in Canada is verified, what could be the impact on the valence bond and molecular orbital theories?
The word theory has to be dropped from valence bond and molecular orbital because theories cannot be wrong.
Valence bond and molecular orbital theories will have to be changed to incorporate the new information because theories can be changed.
Valence bond theory and molecular orbital theory will be eliminated from the current scientific community and taught in schools as historical perspectives.
No changes will occur because theories are scientific laws and new evidence does not impact it.
The bright red line from the emission spectrum of hydrogen has a wavelength of 657nm. What is the energy, in joules, of a single photon of this light?
3.03 x 10-19 J
4.35 x 10-40 J
3.03 x 10-28 J
4.56 x 1014 J
On the AM radio dial, frequencies are measured in kilohertz. What is the approximate wavelength of a radio wave from 1030AM on the radio dial?
2000 to 3000 cm
200 to 300 km
2 to 3 km
200 to 300 m
When German physicist Max Planck proposed Planck's constant h, explaining the pattern of light intensity emitted from a black body at any given frequency, it did not agree with existing models of an atom. Why could theories that are both correct not agree with each other?
New information had to be discovered that would link the two theories together.
Theories are all stand-alone and do not have to agree with other theories.
Atoms are complex and sometimes follow each theory independently of the other.
It just proved that neither theory was correct and they should have started over again.
The energy of violet light is approximately twice that of red light. How do the wavelengths of violet and red light compare?
The wavelength of violet light is sometimes greater than and sometimes less than that of red light.
The wavelength of violet light is the same as that of red light.
The wavelength of violet light is approximately twice that of red light.
The wavelength of violet light is approximately half that of red light.
As electrons fall from high energy orbitals to lower orbitals, energy is released in the form of electromagnetic radiation. The farther the electron falls, the more energy is released. Which of the following electronic transitions would produce a wave with the lowest frequency?
an electron falling from the 6th to the 2nd energy level
an electron falling from the 3rd to the 2nd energy level
an electron falling from the 5th to the 2nd energy level
an electron jumping from the 1st to the 2nd energy level
Which of the following waves would have the lowest energy?
All three waves have the same energy.
When light passes from air to a new medium such as water, the speed of light decreases but the frequency of the light remains constant. If green light has a wavelength of 495 nm in air (c = 3.00x108 m/s), what will be the wavelength of that light in water where the speed of light is reduced to 2.25x108 m/s?
495 nm
659 nm
219 nm
371 nm
A particular nuclear process releases a single gamma ray photon with an energy of 4.75x10-14 joules. What is the frequency of this radiation?
1.43 x 10-5 Hz
7.17 x 1019 Hz
1.39 x 10-20 Hz
2.15 x 1028 Hz
Radio station A broadcasts a signal with a frequency of 98.7 MHz, and radio station B broadcasts a signal with a frequency of 100.3 MHz. What can be said about the relationship of signal A to signal B?
Signal A and signal B have the same energy.
Signal A has more energy than signal B.
Signal A has a longer wavelength than signal B.
Signal A and signal B have the same wavelength.
Which of the following choices lists electromagnetic radiation in order from shortest wavelength to longest wavelength?
X-rays, microwaves, visible light, infrared
X-rays, visible light, infrared, microwaves
microwaves, infrared, visible light, X-rays
infrared, visible light, microwaves, X-rays
Wave C and wave D are similar waves that are being compared. If the frequency in wave D doubles, how would the wavelength change?
Wave D's wavelength would be cut by a fourth.
Wave D's wavelength would be multiplied by a factor of four.
Wave D's wavelength would be cut in half.
Wave D's wavelength would be doubled.
Wave A and wave B are similar waves that are being compared. If the wavelength in wave B is doubled, how would its frequency change?
Wave B's frequency would be doubled.
Wave B's frequency would be cut in half.
Wave B's frequency would be multiplied by a factor of four.
Wave B's frequency would be cut by a fourth.
Which two factors of electromagnetic radiation have an inverse relationship?
amplitude and nodes
energy and frequency
frequency and wavelength
wavelength and energy
Different types of waves are found in the electromagnetic spectrum. List the waves in order of increasing wavelengths.
gamma rays, X-ray, ultraviolet waves, infrared, microwaves, and radio waves
radio waves, microwaves, infrared, gamma rays, ultraviolet waves, and X-ray
infrared, ultraviolet waves, microwaves, radio waves, gamma rays, and X-ray
ultraviolet waves, X-ray, gamma rays, infrared, microwaves, and radio waves
What is the electromagnetic spectrum?
It is the range of wavelengths and frequencies that can be detected by the human eye.
It is a measure of the absorption of radiation as a function of frequency or wavelength.
It is a range containing all of the possible frequencies and wavelengths of electromagnetic radiation.
It is a spectrum of frequencies of electromagnetic radiation emitted by the element's atoms when they are returned to a lower energy state.
A typical cell phone uses wavelengths of 0.36 meters. How much energy does this wave have?
2.4 X 10-34 J
5.5 X 10-25 J
1.1 X 108 J
8.3X108 J
A microwave can have a frequency of 3.8 X 1010Hz. How much energy does this microwave give off in joules?
5.7 X 1043 J
1.14 X 1019 J
2.5 X10-23 J
1.7 X 10-44 J
The government, through the FCC (Federal Communications Commission), has set rules and guidelines for the use of radio equipment to better control wireless frequency "traffic". A wireless server gives off 3.3 X 10-24 joules of energy. What is the wavelength of this server in meters?
2.2 X 10-57 m
6.0 X 10-52 m
5.0 X 109 m
9.1 X1031 m
Red lights on a traffic light have a frequency of 4.3 X 1015 Hz. What is the red light’s wavelength in meters?
1.5 X 10-49 meters
7.0 X 10-8 meters
1.4 X 107 meters
1.3 X 1024 meters
Radar detectors use radio waves to measure the speed of moving vehicles. Radar detectors have a wavelength of 1.8 meters. What is the frequency of waves from a radar detector?
3.7 X 10-34 Hz
6.0 X 10-9 Hz
5.4 X 108 Hz
1.7 X 108 Hz
Upon analysis of a sample of thorium from a nuclear power plant, a researcher finds two isotopes: thorium-231 and thorium-234. The heavier of the two isotopes is more abundant, comprising three-fourths of the sample. Based on this information, can you conclude that this sample is typical of naturally occurring thorium?
Yes, because the average atomic mass is higher than that of naturally occurring thorium.
No, because the average atomic mass is higher than that of naturally occurring thorium.
Yes, because the average atomic mass is lower than that of naturally occurring thorium.
No, because the average atomic mass is lower than that of naturally occurring thorium.
Lead has an average atomic mass of 207.2. Three naturally occurring isotopes of lead are listed in the table along with the percent abundance of two of the isotopes.
21.1%
26.3%
36.9%
73.7%
In a sample of elemental bromine, 55% of the atoms are Br-79, and the remainder are Br-81. If this sample is typical of naturally occurring bromine, what is the average atomic mass of bromine?
79.9 amu
35.0 amu
45.0 amu
80.0 amu
The two most abundant isotopes of copper contain 34 and 36 neutrons. If the isotope with 34 neutrons comprises 72.5% of all copper, what is the average atomic mass of copper?
50.0 amu
34.6 amu
29.0 amu
63.6 amu
Carbon, with a mass of 12.01 amu, has three naturally occurring isotopes: each containing either 6, 7, or 8 neutrons. If the isotope with 7 neutrons is extremely rare (only 0.1% abundance), what is the percentage of carbon that has 8 neutrons?
0.45%
0.00%
3.00%
7.36%
A sample of lead is found to contain three isotopes: 23.5% of the sample has a mass of 204 amu, 24.1% has a mass of 207 amu, and the remainder has a mass of 208 amu. What is the average atomic mass of lead?
206.3 amu
207.2 amu
206.8 amu
82.0 amu
When given the following information, what is the molar mass of element "J"?
30.7 amu
31.1 amu
33.3 amu
3106. amu
Determine the element according to the mass abundance data in the table.
aluminum
chromium
magnesium
sodium
The following table shows the mass and abundance of three isotopes of element J. Which set up would calculate the average atomic mass of element J correctly?
15 + 50 + 35 / 3 = Average atomic mass of J
Mass Z + Mass Y + Mass W / 3 = Average atomic mass of J
(Mass Z x 0.15) + (Mass Y x 0.50) + (Mass W x 0.35) = Average atomic mass of J
(Mass Z + 0.15) + (Mass Y + 0.50) + (Mass W +0.35) = Average atomic mass of J
Boron has the average atomic mass of 10.81 and has two naturally occurring isotopes (Boron-10 and Boron-11). Which isotope of boron is more abundant?
Boron-10 is more abundant.
Boron-11 is more abundant.
Boron-10 and boron-11 have the same abundance.
There is not enough information to make that determination.
How many protons and neutrons are in one atom of 1430Si
14 protons and 14 neutrons
14 protons and 16 neutrons
16 protons and 14 neutrons
16 protons and 16 neutrons
What is the average atomic mass of neon?
10.50 amu
20.19 amu
21.00 amu
2018.77 amu
Which of the following scientists is credited with being part of the Quantum model of the atom?
Thompson
Rutherford
Einstein
Dalton
