MSU CEM 141 REAL EXAM LATEST 2026-
2027 FINAL EXAM WITH QUESTIONS
AND CORRECT DETAILED CORRECT
ANSWERS ALREADY GRADED A+
scientific question
ANSWER-can be answered by doing experiments, making observation, taking measurements,
etc. in a replicable way
Lights acts as what?
ANSWER-Particle and wave.
scientific model
ANSWER-drawing, graph, diagram, equation. represent many chemical entities.
Wavelength
ANSWER-The distance (m) of waves from peak to peak. Short: x-ray (red), long: infrared (blue)
Short - higher energy
,Long - lower energy
scientific theory
ANSWER-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)
ANSWER-The number of wavefronts per second. Highest: x-ray
scientific law
ANSWER-A theory that has been tested by and is consistent with generations of data. a rule that
describes a pattern in nature (explains what)
Velocity of Light
ANSWER-C = 3.00 X 10^8
= wavelength X frequency
scientific explanation
claim, evidence, reasoning
Amplitude
,The intensity, height of peaks of waves. Highest: blue light
size of an atom
0.1 x 10^-9m
Energy of Wave (J)
Increases as frequency increases and as wavelength decreases. Highest: x-ray
Greek philosophers atomic theory
-first atomic theory
-elements: earth, fire, water, air
-constantly in motion
-made of mostly empty space
Range of Wavelengths
10^-16 - 10^8 = 24. Only a third are visible
Black Body Radiation
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 ___
the observable properties
atom
smallest distinguishable part of an element
Photoelectric Effect
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?
91 naturally occurring elements
How many electrons are emitted if the light is below it's threshold frequency no matter the
intensity?
None.
Dalton's atomic theory (1800s)
-elements composed of small, indivisible, indestructible, particles (atoms)
2027 FINAL EXAM WITH QUESTIONS
AND CORRECT DETAILED CORRECT
ANSWERS ALREADY GRADED A+
scientific question
ANSWER-can be answered by doing experiments, making observation, taking measurements,
etc. in a replicable way
Lights acts as what?
ANSWER-Particle and wave.
scientific model
ANSWER-drawing, graph, diagram, equation. represent many chemical entities.
Wavelength
ANSWER-The distance (m) of waves from peak to peak. Short: x-ray (red), long: infrared (blue)
Short - higher energy
,Long - lower energy
scientific theory
ANSWER-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)
ANSWER-The number of wavefronts per second. Highest: x-ray
scientific law
ANSWER-A theory that has been tested by and is consistent with generations of data. a rule that
describes a pattern in nature (explains what)
Velocity of Light
ANSWER-C = 3.00 X 10^8
= wavelength X frequency
scientific explanation
claim, evidence, reasoning
Amplitude
,The intensity, height of peaks of waves. Highest: blue light
size of an atom
0.1 x 10^-9m
Energy of Wave (J)
Increases as frequency increases and as wavelength decreases. Highest: x-ray
Greek philosophers atomic theory
-first atomic theory
-elements: earth, fire, water, air
-constantly in motion
-made of mostly empty space
Range of Wavelengths
10^-16 - 10^8 = 24. Only a third are visible
Black Body Radiation
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 ___
the observable properties
atom
smallest distinguishable part of an element
Photoelectric Effect
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?
91 naturally occurring elements
How many electrons are emitted if the light is below it's threshold frequency no matter the
intensity?
None.
Dalton's atomic theory (1800s)
-elements composed of small, indivisible, indestructible, particles (atoms)
