WorksheetsChemistry Unit 1
Total questions: 19
Worksheet time: 10mins
Light of a certain energy shines on a metal and causes electrons to be emitted.Based on the research of Albert Einstein, what change would most likely result in stopping the emission of electrons from this metal?
an increase in the intensity of the light
a decrease in the intensity of the light
the use of light that has a higher frequency
the use of light that has a lower frequency
Natalie observes these characteristics in the model of an atom.
(i) includes positive charge
(ii) contains electrons
(iii) explains the photoelectric effect
(iv) suggests the probable location of electrons
Which model is Natalie most likely examining?
Bohr model
model
Dalton’s model
plum pudding model
electron-cloud
According to the Bohr model of an atom, what happens when an electron moves from the second energy level to the third energy level and then back to the second energy level?
Energy is absorbed and then stored in the atom.
Energy is released and then absorbed to form an absorption line.
Energy is absorbed and then released to form an emission line.
Energy is released from the atom, and the outer level is weakened.
Which observation provided Albert Einstein the clue that he needed to explain the photoelectric effect?
Light is made up of extremely small particles.
Particles that are emitted from a strip of metal are electrons.
Shining light on a metal strip produces emissions.
Energy of electrons depends on light’s frequency, not intensity
The emission spectrum of hydrogen shows discrete, bright, colored lines. Which characteristic of the Bohr model is best supported by this observation?
Electrons cannot exist in locations other than in specific orbits.
Energy is released when an electron moves to a higher energy level.
Smaller atoms have fewer spectral lines than larger atoms.
The energy of an electron increases with distance from the nucleus.
A change in which property of light will have no effect on whether or not the photoelectric effect occurs?
frequency
energy
intensity
intensity
wavelength
The diagram shows Niels Bohr’s model of an atom.
What happens when the electron moves from the first energy level to the second energy level?
Energy is absorbed, and an emission line is produced.
Energy is released, and an emission line is produced.
Energy is absorbed by the atom.
Energy is lost from the atom.
Which equation was used by Albert Einstein to explain the photoelectric effect? [E = energy, h = Planck’s constant, and v = frequency.]
E =h/v
E = hv
E =v/h
E = h - v
This flow chart shows the amount of energy that is emitted by each type of light.
ultraviolet > blue light > yellow light > red light
(maximum energy) (minimum energy)
In an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect?
ultraviolet light
dim blue light
bright red light
bright yellow light
The modern-day quantum model of the atom is better than John Dalton’s model because it
has set electron orbits.
has positive and negative particles in the nucleus.
can be represented in one dimension.
answers many questions about atoms.
A particle that travels around the nucleus of an atom in orbitals is called a(n)
quark.
proton.
neutron.
electron.
Boron occurs naturally as two isotopes. What is the difference between these isotopes?
they have different numbers of electrons and different charges.
They have different numbers of neutrons and different charges.
They have different numbers of protons and different mass numbers.
They have different numbers of neutrons and different mass numbers.
What is the charge on an electron?
–1
0
+1
+2
A lithium atom has three protons, three neutrons, and three electrons. What is the overall charge on this atom?
-3
0
+1
+3
An atom contains one proton, one electron, and one neutron. Which two particles are most similar in mass?
the neutron and the electron
the proton and the electron
the proton and the neutron
the neutron and the atom
In which of these statements are protons, electrons, and neutrons correctly compared?
Quarks are present in protons and neutrons but not in electrons.
Quarks are present in protons, neutrons, and electrons.
Quarks are present in neutrons and electrons but not in protons.
Quarks are present in protons and electrons but not in neutrons.
Carbon-12 and carbon-13 are isotopes of carbon. Which of the following statements is correct?
They both have seven protons in the nucleus.
They both have the same mass number.
They both have seven neutrons in the nucleus.
they both have the same atomic number
Which two particles are found in the nucleus of an atom?
neutrons and electrons
protons and electrons
protons and neutrons
neutrons and atoms
A scientist uses an accelerator and high energy electrons to study the particles inside the protons of a helium atom. What particles is the scientist studying?
the He neutrons
the He nucleus
the He electrons
the He quarks
