CHM2046L Exam Study Guide –
Practice Questions with
Verified Answers. GRADED A+.
Latest 2026/2027 Update.
What particle is emitted during alpha decay? - Answer✔✔-Helium nucleus, 2
protons, 2 neutrons
What changes occur to an atom's mass and atomic number during alpha
decay? - Answer✔✔-Mass number decreases by 4, atomic number decreases
by 2
What particle is emitted during beta decay? - Answer✔✔-Electron (β particle)
What changes occur during beta decay? - Answer✔✔-Mass number stays the
same, atomic number increases by 1
What is emitted during gamma decay? - Answer✔✔-High-energy photon (γ
ray), no change in mass or atomic number
Which type of radiation is the most penetrating? - Answer✔✔-Gamma rays
,What blocks alpha particles? - Answer✔✔-Paper
What blocks beta particles? - Answer✔✔-Aluminum sheet
What can partially block gamma rays? - Answer✔✔-Thick lead, dense concrete
What is the order of radioactive decay reactions? - Answer✔✔-First-order
reactions
What graph is linear for a first-order reaction? - Answer✔✔-ln[A] vs time
What is the formula for half-life in first-order kinetics? - Answer✔✔-t₁/₂ = 0.693
÷k
What is the formula to calculate the percent error? - Answer✔✔-(|measured -
true| ÷ true) × 100
What does accuracy refer to? - Answer✔✔-How close a measurement is to the
true value
What does precision refer to? - Answer✔✔-How close repeated measurements
are to each other
What type of error affects accuracy? - Answer✔✔-Systematic error
What type of error affects precision? - Answer✔✔-Random error
, What safety precautions must you take with radioactive materials? -
Answer✔✔-Wear gloves, wear goggles, wear lab coat, use shielding, minimize
exposure time
What does Beer's Law state? - Answer✔✔-Absorbance is directly proportional
to concentration
What is the equation for Beer's Law? - Answer✔✔-A = εbc
In Beer's Law, what does A represent? - Answer✔✔-Absorbance
In Beer's Law, what does ε represent? - Answer✔✔-Molar absorptivity
In Beer's Law, what does b represent? - Answer✔✔-Path length of the cuvette
in cm
In Beer's Law, what does c represent? - Answer✔✔-Concentration of the
solution
What happens to absorbance as concentration increases? - Answer✔✔-
Absorbance increases
If a solution appears blue, what wavelength of light is it absorbing? -
Answer✔✔-Orange, around 620 nm
Practice Questions with
Verified Answers. GRADED A+.
Latest 2026/2027 Update.
What particle is emitted during alpha decay? - Answer✔✔-Helium nucleus, 2
protons, 2 neutrons
What changes occur to an atom's mass and atomic number during alpha
decay? - Answer✔✔-Mass number decreases by 4, atomic number decreases
by 2
What particle is emitted during beta decay? - Answer✔✔-Electron (β particle)
What changes occur during beta decay? - Answer✔✔-Mass number stays the
same, atomic number increases by 1
What is emitted during gamma decay? - Answer✔✔-High-energy photon (γ
ray), no change in mass or atomic number
Which type of radiation is the most penetrating? - Answer✔✔-Gamma rays
,What blocks alpha particles? - Answer✔✔-Paper
What blocks beta particles? - Answer✔✔-Aluminum sheet
What can partially block gamma rays? - Answer✔✔-Thick lead, dense concrete
What is the order of radioactive decay reactions? - Answer✔✔-First-order
reactions
What graph is linear for a first-order reaction? - Answer✔✔-ln[A] vs time
What is the formula for half-life in first-order kinetics? - Answer✔✔-t₁/₂ = 0.693
÷k
What is the formula to calculate the percent error? - Answer✔✔-(|measured -
true| ÷ true) × 100
What does accuracy refer to? - Answer✔✔-How close a measurement is to the
true value
What does precision refer to? - Answer✔✔-How close repeated measurements
are to each other
What type of error affects accuracy? - Answer✔✔-Systematic error
What type of error affects precision? - Answer✔✔-Random error
, What safety precautions must you take with radioactive materials? -
Answer✔✔-Wear gloves, wear goggles, wear lab coat, use shielding, minimize
exposure time
What does Beer's Law state? - Answer✔✔-Absorbance is directly proportional
to concentration
What is the equation for Beer's Law? - Answer✔✔-A = εbc
In Beer's Law, what does A represent? - Answer✔✔-Absorbance
In Beer's Law, what does ε represent? - Answer✔✔-Molar absorptivity
In Beer's Law, what does b represent? - Answer✔✔-Path length of the cuvette
in cm
In Beer's Law, what does c represent? - Answer✔✔-Concentration of the
solution
What happens to absorbance as concentration increases? - Answer✔✔-
Absorbance increases
If a solution appears blue, what wavelength of light is it absorbing? -
Answer✔✔-Orange, around 620 nm
