Chemistry in Context - Exam 4 - Gray
CSU questions and answers graded
A+ 2025/2026
What percentage of US energy came from nuclear power generation in 2014? - correct answer
✔✔8.33%
how many EJ in one quad? - correct answer ✔✔1.055
How much energy in quads did the US consume in 2014? - correct answer ✔✔98.3 quads
Convert one EJ into Joules - correct answer ✔✔10^18 joules
A watt is - correct answer ✔✔1 joule per second
a micro meter (µm) is - correct answer ✔✔1^-6 meters
a nano meter (nm) is - correct answer ✔✔1^-9 meters
the oxidation state of oxygen - correct answer ✔✔-2
energy produced by a one GW power plant in one year - correct answer ✔✔3.154 x 10^16 J
alpha radioactivity - correct answer ✔✔- 2protons 2 neutrons
-2+ charge
, -Mass number decreases by 4, atomic number decreases by 2
-blocked by dead skin layer—only dangerous if ingested
beta radioactivity - correct answer ✔✔-An electron
-Charge 1-
-mass number does not change
-atomic number increases by 1
-blocked by Plexiglas and distance
gama radioactivity - correct answer ✔✔-a photon
-charge 0
-no change in mass or atomic number
-blocked by lead, concrete, or other dense materials
how many licensed power plants in US? - correct answer ✔✔99 (104 operating)
Positives of nuclear - correct answer ✔✔no carbon dioxide emissions
- can operate at any time (dispatchable)
Negatives of nuclear - correct answer ✔✔expensive setup
- radioactive waste
- security concerns
- only produces electricity
How many new nuclear power plants would have to be built to replace the US electricity
generated by fossil fuel combustion? - correct answer ✔✔279
CSU questions and answers graded
A+ 2025/2026
What percentage of US energy came from nuclear power generation in 2014? - correct answer
✔✔8.33%
how many EJ in one quad? - correct answer ✔✔1.055
How much energy in quads did the US consume in 2014? - correct answer ✔✔98.3 quads
Convert one EJ into Joules - correct answer ✔✔10^18 joules
A watt is - correct answer ✔✔1 joule per second
a micro meter (µm) is - correct answer ✔✔1^-6 meters
a nano meter (nm) is - correct answer ✔✔1^-9 meters
the oxidation state of oxygen - correct answer ✔✔-2
energy produced by a one GW power plant in one year - correct answer ✔✔3.154 x 10^16 J
alpha radioactivity - correct answer ✔✔- 2protons 2 neutrons
-2+ charge
, -Mass number decreases by 4, atomic number decreases by 2
-blocked by dead skin layer—only dangerous if ingested
beta radioactivity - correct answer ✔✔-An electron
-Charge 1-
-mass number does not change
-atomic number increases by 1
-blocked by Plexiglas and distance
gama radioactivity - correct answer ✔✔-a photon
-charge 0
-no change in mass or atomic number
-blocked by lead, concrete, or other dense materials
how many licensed power plants in US? - correct answer ✔✔99 (104 operating)
Positives of nuclear - correct answer ✔✔no carbon dioxide emissions
- can operate at any time (dispatchable)
Negatives of nuclear - correct answer ✔✔expensive setup
- radioactive waste
- security concerns
- only produces electricity
How many new nuclear power plants would have to be built to replace the US electricity
generated by fossil fuel combustion? - correct answer ✔✔279
