MSU CEM 141 Final Exam Prep Newest Actual Exam With Complete Questions
And Correct Detailed Answers (Verified Answers) |Already Graded A+
scientific question - (Correct Answer)-can be answered by doing experiments, making
observation, taking measurements, etc. in a replicable way
Lights acts as what? - (Correct Answer)-Particle and wave.
scientific model - (Correct Answer)-drawing, graph, diagram, equation. represent many chemical
entities.
Wavelength - (Correct 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 - (Correct 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) - (Correct Answer)-The number of wavefronts per second. Highest: x-ray
scientific law - (Correct 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 - (Correct Answer)-C = 3.00 X 10^8
= wavelength X frequency
scientific explanation - (Correct Answer)-claim, evidence, reasoning
Amplitude - (Correct Answer)-The intensity, height of peaks of waves. Highest: blue light
, 2
size of an atom - (Correct Answer)-0.1 x 10^-9m
Energy of Wave (J) - (Correct Answer)-Increases as frequency increases and as wavelength
decreases. Highest: x-ray
Greek philosophers atomic theory - (Correct Answer)--first atomic theory
-elements: earth, fire, water, air
-constantly in motion
-made of mostly empty space
Range of Wavelengths - (Correct Answer)-10^-16 - 10^8 = 24. Only a third are visible
Black Body Radiation - (Correct Answer)-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 Answer)-the observable properties
atom - (Correct Answer)-smallest distinguishable part of an element
Photoelectric Effect - (Correct Answer)-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 Answer)-91 naturally occurring elements
, 3
How many electrons are emitted if the light is below it's threshold frequency no matter the
intensity? - (Correct Answer)-None.
Dalton's atomic theory (1800s) - (Correct Answer)--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
Answer)-Intensity.
JJ Thomson - (Correct Answer)--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 Answer)-Photon.
cathode ray tube - (Correct Answer)--JJ Thomson
-electron particles were emitted from cathodes
-particles carried electric charge
-ray was independent of the element it came from
-particles identical regardless of cathode
-proved all atoms contained electrons
And Correct Detailed Answers (Verified Answers) |Already Graded A+
scientific question - (Correct Answer)-can be answered by doing experiments, making
observation, taking measurements, etc. in a replicable way
Lights acts as what? - (Correct Answer)-Particle and wave.
scientific model - (Correct Answer)-drawing, graph, diagram, equation. represent many chemical
entities.
Wavelength - (Correct 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 - (Correct 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) - (Correct Answer)-The number of wavefronts per second. Highest: x-ray
scientific law - (Correct 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 - (Correct Answer)-C = 3.00 X 10^8
= wavelength X frequency
scientific explanation - (Correct Answer)-claim, evidence, reasoning
Amplitude - (Correct Answer)-The intensity, height of peaks of waves. Highest: blue light
, 2
size of an atom - (Correct Answer)-0.1 x 10^-9m
Energy of Wave (J) - (Correct Answer)-Increases as frequency increases and as wavelength
decreases. Highest: x-ray
Greek philosophers atomic theory - (Correct Answer)--first atomic theory
-elements: earth, fire, water, air
-constantly in motion
-made of mostly empty space
Range of Wavelengths - (Correct Answer)-10^-16 - 10^8 = 24. Only a third are visible
Black Body Radiation - (Correct Answer)-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 Answer)-the observable properties
atom - (Correct Answer)-smallest distinguishable part of an element
Photoelectric Effect - (Correct Answer)-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 Answer)-91 naturally occurring elements
, 3
How many electrons are emitted if the light is below it's threshold frequency no matter the
intensity? - (Correct Answer)-None.
Dalton's atomic theory (1800s) - (Correct Answer)--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
Answer)-Intensity.
JJ Thomson - (Correct Answer)--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 Answer)-Photon.
cathode ray tube - (Correct Answer)--JJ Thomson
-electron particles were emitted from cathodes
-particles carried electric charge
-ray was independent of the element it came from
-particles identical regardless of cathode
-proved all atoms contained electrons
