CEM 141 EXAM 2 2026 STOICHIOMETRY AND
CALCULATIONS WORKBOOK SOLVED
QUESTIONS COMPILATION
◉ T/F: The spectrum of an element is the same whether that
element is on earth, sun, or a galaxy far away.
Answer: True.
◉ What did Bohr discover?
Answer: Electrons move in orbits around the nucleus at select
energy levels (quantum numbers).
◉ How did Bohr explain the emission and absorption spectrum?
Answer: Quantum numbers (n).
◉ Are energy levels orbits?
Answer: No.
◉ How do electrons transition between energy levels?
Answer: Absorbing or Emitting photons.
, ◉ How is absorption and emission different than the photoelectric
effect?
Answer: In the photoelectric effect, an atom absorbs a photon
resulting in the ejection of an electron. The electron is leaving the
atom and not moving a different energy level.
◉ T/F: Matter is a wave and a particle?
Answer: True.
◉ What did De Broglie discover?
Answer: Matter is wave and a particle.
◉ Does wavelength affect the properties of macroscopic objects?
Answer: No.
◉ Does wavelength affect the properties of electrons?
Answer: Yes.
◉ Heisenberg Uncertainty Principle
Answer: It is impossible to know exactly both the velocity and the
position of a particle at the same time.
◉ Why is Bohr's model incorrect?
CALCULATIONS WORKBOOK SOLVED
QUESTIONS COMPILATION
◉ T/F: The spectrum of an element is the same whether that
element is on earth, sun, or a galaxy far away.
Answer: True.
◉ What did Bohr discover?
Answer: Electrons move in orbits around the nucleus at select
energy levels (quantum numbers).
◉ How did Bohr explain the emission and absorption spectrum?
Answer: Quantum numbers (n).
◉ Are energy levels orbits?
Answer: No.
◉ How do electrons transition between energy levels?
Answer: Absorbing or Emitting photons.
, ◉ How is absorption and emission different than the photoelectric
effect?
Answer: In the photoelectric effect, an atom absorbs a photon
resulting in the ejection of an electron. The electron is leaving the
atom and not moving a different energy level.
◉ T/F: Matter is a wave and a particle?
Answer: True.
◉ What did De Broglie discover?
Answer: Matter is wave and a particle.
◉ Does wavelength affect the properties of macroscopic objects?
Answer: No.
◉ Does wavelength affect the properties of electrons?
Answer: Yes.
◉ Heisenberg Uncertainty Principle
Answer: It is impossible to know exactly both the velocity and the
position of a particle at the same time.
◉ Why is Bohr's model incorrect?
