CHEM 103 EXAM QUESTIONS AND
ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT!!!
Q: In what way is chemical energy released or utilized?
A: ✔️✔️ By facilitating chemical reactions that rearrange the types and the
relative strengths of atomic bonds within a substance.
Q: What is the reason combustion reactions typically release energy?
A: ✔️✔️ X-O bonds tend to be stronger than X-X and O-O bonds
Q: Rank the following fuels from highest to lowest energy density (energy
per gram): Coal, Ethanol, Gasoline ($C_8H_{18}$), Natural Gas
($CH_4$), and Wood.
A: ✔️✔️ CH4 > gasoline > coal > ethanol > wood
Q: What are the primary global obstacles and concerns regarding our
current energy use?
A: ✔️✔️
The acceleration of Global Climate Change due to $CO_2$ emissions.
The depletion of easily accessible petroleum ("Peak Oil").
Geopolitical risks regarding Energy Security.
Rising global demand for power.
Significant impacts on the global economy.
Environmental degradation through air and water pollution.
Q: What are the main advantages of using coal as an energy source?
A: ✔️✔️ It is highly abundant and found in various locations across the globe,
making it a geographically accessible resource.
What are the minuses of Coal? -ANSWER ✔️✔️- a solid
- lower energy content than petroleum, more CO2, emission per unit energy
-difficult & dangerous to obtain
-environmentally disruptive to obtain & utilize (remember So2 & NO2)
What are the pluses of natural gas? -ANSWER ✔️✔️- relatively abundance (we
have a lot)
, -'clean' due to high energy content & less CO2 emission per unit energy than
oil
What are the minuses of natural gas? -ANSWER ✔️✔️- a gas (difficult to ship
overseas)
-still does emit CO2
-combustion still can generate NO2
What are the pluses of oil/petroleum? -ANSWER ✔️✔️- high energy content
-a liquid (easy to pump, store, & transport)
- we know how to use it
What are the minuses of oil/petroleum? -ANSWER ✔️✔️- we're running out of it
- it tends to be in places that aren't friendly
- it does emit CO2
- combustion generates NO2
What's involved in refining crude oil to gasoline? -ANSWER ✔️✔️-Distillation
-Catalytic Cracking
-Oligomerization
-Reforming
What's a Catalyst? -ANSWER ✔️✔️By providing an alternative reaction
pathway, reaction can proceed with less energy input -- catalyst is not
transformed due to the reaction (catalyst is reused many times)
What are the pluses of wind power? -ANSWER ✔️✔️- wind is "free"
- wind is abundant (but localized)
What are the minuses of wind power? -ANSWER ✔️✔️- have to build
infrastructure (takes energy & $$$)
-the wind doesn't blow all the time, have to have a load balance
-wind isn't where people are have to transport the energy (with losses)
- destroys views
- covers land
What goes into a lifecycle cost analysis? -ANSWER ✔️✔️- energy for
construction
ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT!!!
Q: In what way is chemical energy released or utilized?
A: ✔️✔️ By facilitating chemical reactions that rearrange the types and the
relative strengths of atomic bonds within a substance.
Q: What is the reason combustion reactions typically release energy?
A: ✔️✔️ X-O bonds tend to be stronger than X-X and O-O bonds
Q: Rank the following fuels from highest to lowest energy density (energy
per gram): Coal, Ethanol, Gasoline ($C_8H_{18}$), Natural Gas
($CH_4$), and Wood.
A: ✔️✔️ CH4 > gasoline > coal > ethanol > wood
Q: What are the primary global obstacles and concerns regarding our
current energy use?
A: ✔️✔️
The acceleration of Global Climate Change due to $CO_2$ emissions.
The depletion of easily accessible petroleum ("Peak Oil").
Geopolitical risks regarding Energy Security.
Rising global demand for power.
Significant impacts on the global economy.
Environmental degradation through air and water pollution.
Q: What are the main advantages of using coal as an energy source?
A: ✔️✔️ It is highly abundant and found in various locations across the globe,
making it a geographically accessible resource.
What are the minuses of Coal? -ANSWER ✔️✔️- a solid
- lower energy content than petroleum, more CO2, emission per unit energy
-difficult & dangerous to obtain
-environmentally disruptive to obtain & utilize (remember So2 & NO2)
What are the pluses of natural gas? -ANSWER ✔️✔️- relatively abundance (we
have a lot)
, -'clean' due to high energy content & less CO2 emission per unit energy than
oil
What are the minuses of natural gas? -ANSWER ✔️✔️- a gas (difficult to ship
overseas)
-still does emit CO2
-combustion still can generate NO2
What are the pluses of oil/petroleum? -ANSWER ✔️✔️- high energy content
-a liquid (easy to pump, store, & transport)
- we know how to use it
What are the minuses of oil/petroleum? -ANSWER ✔️✔️- we're running out of it
- it tends to be in places that aren't friendly
- it does emit CO2
- combustion generates NO2
What's involved in refining crude oil to gasoline? -ANSWER ✔️✔️-Distillation
-Catalytic Cracking
-Oligomerization
-Reforming
What's a Catalyst? -ANSWER ✔️✔️By providing an alternative reaction
pathway, reaction can proceed with less energy input -- catalyst is not
transformed due to the reaction (catalyst is reused many times)
What are the pluses of wind power? -ANSWER ✔️✔️- wind is "free"
- wind is abundant (but localized)
What are the minuses of wind power? -ANSWER ✔️✔️- have to build
infrastructure (takes energy & $$$)
-the wind doesn't blow all the time, have to have a load balance
-wind isn't where people are have to transport the energy (with losses)
- destroys views
- covers land
What goes into a lifecycle cost analysis? -ANSWER ✔️✔️- energy for
construction
