MSU CEM 141 FINAL EXAM Questions and
Answers (Solved Papers)
scientific question - Correct Answers ✅can be answered by
doing experiments, making observation, taking
measurements, etc. in a replicable way
Lights acts as what? - Correct Answers ✅Particle and
wave.
scientific model - Correct Answers ✅drawing, graph,
diagram, equation. represent many chemical entities.
Wavelength - Correct Answers ✅The distance (m) of waves
from peak to peak. Short: x-ray (red), long: infrared (blue)
Short - higher energy
Long - lower energy
scientific theory - Correct Answers ✅A well tested concept
that explains a wide range of observations (explains why).
changes with time. Explains the underlying cause of a range
of phenomena
Frequency (V) - Correct Answers ✅The number of
wavefronts per second. Highest: x-ray
scientific law - Correct Answers ✅A theory that has been
tested by and is consistent with generations of data. a rule
that describes a pattern in nature (explains what)
,MSU CEM 141 FINAL EXAM Questions and
Answers (Solved Papers)
Velocity of Light - Correct Answers ✅C = 3.00 X 10^8
= wavelength X frequency
scientific explanation - Correct Answers ✅claim, evidence,
reasoning
Amplitude - Correct Answers ✅The intensity, height of
peaks of waves. Highest: blue light
size of an atom - Correct Answers ✅0.1 x 10^-9m
Energy of Wave (J) - Correct Answers ✅Increases as
frequency increases and as wavelength decreases. Highest:
x-ray
Greek philosophers atomic theory - Correct Answers ✅-first
atomic theory
-elements: earth, fire, water, air
-constantly in motion
-made of mostly empty space
Range of Wavelengths - Correct Answers ✅10^-16 - 10^8
= 24. Only a third are visible
,MSU CEM 141 FINAL EXAM Questions and
Answers (Solved Papers)
Black Body Radiation - Correct Answers ✅When a mass is
heated it emits a type of EM radiation, at very high temps the
mass becomes "white hot" because all wavelengths of visible
light become equally intense
molecular structure of a substance determines ___ - Correct
Answers ✅the observable properties
atom - Correct Answers ✅smallest distinguishable part of
an element
Photoelectric Effect - Correct Answers ✅Metals emit
electrons when electromagnetic radiation shines on the
surface, light is transfers energy to the electrons at the
metal's surface where it's transformed into KE that gives the
electrons enough energy to leave the atom
Depends on frequency not intensity
how many atoms are naturally occurring? - Correct Answers
✅91 naturally occurring elements
How many electrons are emitted if the light is below it's
threshold frequency no matter the intensity? - Correct
Answers ✅None.
, MSU CEM 141 FINAL EXAM Questions and
Answers (Solved Papers)
Dalton's atomic theory (1800s) - Correct Answers ✅-
elements composed of small, indivisible, indestructible,
particles (atoms)
-all atoms of each element are identical (mass/properties)
-no subatomic particles
-compounds are formed by combos of atoms from 2+
elements
-chemical reactions occur from rearrangement of atoms
What increases the number of electrons to be emitted by the
photoelectric effect? - Correct Answers ✅Intensity.
JJ Thomson - Correct Answers ✅-first person to provide
evidence of electron
-cathode ray tube
-plum pudding model
-particles carried electric charge
A particle that transfers light energy with a definable energy,
emits one electron
energy of = h (6.626 x 10^-34 J) - Correct Answers
✅Photon.
cathode ray tube - Correct Answers ✅-JJ Thomson
-electron particles were emitted from cathodes
Answers (Solved Papers)
scientific question - Correct Answers ✅can be answered by
doing experiments, making observation, taking
measurements, etc. in a replicable way
Lights acts as what? - Correct Answers ✅Particle and
wave.
scientific model - Correct Answers ✅drawing, graph,
diagram, equation. represent many chemical entities.
Wavelength - Correct Answers ✅The distance (m) of waves
from peak to peak. Short: x-ray (red), long: infrared (blue)
Short - higher energy
Long - lower energy
scientific theory - Correct Answers ✅A well tested concept
that explains a wide range of observations (explains why).
changes with time. Explains the underlying cause of a range
of phenomena
Frequency (V) - Correct Answers ✅The number of
wavefronts per second. Highest: x-ray
scientific law - Correct Answers ✅A theory that has been
tested by and is consistent with generations of data. a rule
that describes a pattern in nature (explains what)
,MSU CEM 141 FINAL EXAM Questions and
Answers (Solved Papers)
Velocity of Light - Correct Answers ✅C = 3.00 X 10^8
= wavelength X frequency
scientific explanation - Correct Answers ✅claim, evidence,
reasoning
Amplitude - Correct Answers ✅The intensity, height of
peaks of waves. Highest: blue light
size of an atom - Correct Answers ✅0.1 x 10^-9m
Energy of Wave (J) - Correct Answers ✅Increases as
frequency increases and as wavelength decreases. Highest:
x-ray
Greek philosophers atomic theory - Correct Answers ✅-first
atomic theory
-elements: earth, fire, water, air
-constantly in motion
-made of mostly empty space
Range of Wavelengths - Correct Answers ✅10^-16 - 10^8
= 24. Only a third are visible
,MSU CEM 141 FINAL EXAM Questions and
Answers (Solved Papers)
Black Body Radiation - Correct Answers ✅When a mass is
heated it emits a type of EM radiation, at very high temps the
mass becomes "white hot" because all wavelengths of visible
light become equally intense
molecular structure of a substance determines ___ - Correct
Answers ✅the observable properties
atom - Correct Answers ✅smallest distinguishable part of
an element
Photoelectric Effect - Correct Answers ✅Metals emit
electrons when electromagnetic radiation shines on the
surface, light is transfers energy to the electrons at the
metal's surface where it's transformed into KE that gives the
electrons enough energy to leave the atom
Depends on frequency not intensity
how many atoms are naturally occurring? - Correct Answers
✅91 naturally occurring elements
How many electrons are emitted if the light is below it's
threshold frequency no matter the intensity? - Correct
Answers ✅None.
, MSU CEM 141 FINAL EXAM Questions and
Answers (Solved Papers)
Dalton's atomic theory (1800s) - Correct Answers ✅-
elements composed of small, indivisible, indestructible,
particles (atoms)
-all atoms of each element are identical (mass/properties)
-no subatomic particles
-compounds are formed by combos of atoms from 2+
elements
-chemical reactions occur from rearrangement of atoms
What increases the number of electrons to be emitted by the
photoelectric effect? - Correct Answers ✅Intensity.
JJ Thomson - Correct Answers ✅-first person to provide
evidence of electron
-cathode ray tube
-plum pudding model
-particles carried electric charge
A particle that transfers light energy with a definable energy,
emits one electron
energy of = h (6.626 x 10^-34 J) - Correct Answers
✅Photon.
cathode ray tube - Correct Answers ✅-JJ Thomson
-electron particles were emitted from cathodes
