Chemistry ยท General Awareness
Carbon and Fossil Fuels
1,898 Questions
Review fundamental concepts regarding carbon compounds, coal distillation, and fossil fuel formation. This segment covers the chemical properties and industrial applications of natural gas and crude oil. Practicing these questions will strengthen your chemistry foundation for general science sections.
Coal distillationPetroleum formationProperties of crude oilNatural gas applications
Carbon and Fossil Fuels Questions
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a solid fuel
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a liquid fuel
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a gaseous fuel
A
Correct answer
Explanation
Coal is a fossil fuel that exists in a solid state at room temperature.
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Combustion
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Consumption
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Deposition
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Respiration
A
Correct answer
Explanation
Combustion is the chemical reaction of a substance with oxygen, releasing heat and often carbon dioxide, which is exactly what happens when fossil fuels are burned. The other options refer to biological or geological processes.
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The nitrogen from surrounding air
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vaporized candle wax made of hydrogen & carbon
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the fibers within the candle's wick
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the flame creates its own fuel once lit
B
Correct answer
Explanation
Candles burn because the heat melts the wax, which then travels up the wick and vaporizes. This vaporized wax, composed of hydrocarbons, reacts with oxygen to sustain the flame.
A
Correct answer
Explanation
Soot is primarily composed of unburned carbon particles. It forms when there is insufficient oxygen or temperature for complete combustion.
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Yellow light is dominate on the spectrum when carbon ignites
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Yellow light is dominate on the spectrum when oxygen ignites
A
Correct answer
Explanation
The yellow color in a flame is caused by incandescent carbon particles that are heated to high temperatures, emitting light in the yellow part of the spectrum.
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because this part of the flame is rich in oxygen
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because there is relatively no oxygen in this part
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because carbon oxidation occurs in this area
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because it is the coolest part of the flame
A
Correct answer
Explanation
The base of a candle flame is blue because it is where the fuel vapor first mixes with oxygen, allowing for complete combustion.
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rise of cooler oxygen
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a convection current
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a water vapor current
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the sinking of carbon dioxide
B
Correct answer
Explanation
As the air around the flame is heated, it becomes less dense and rises. This creates a convection current that pulls fresh oxygen toward the base and shapes the flame.
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crude oil
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rock oil
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petroleum
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all of these
D
Correct answer
Explanation
Petrochemicals are chemical products derived from petroleum. Since crude oil and rock oil are synonyms for petroleum, all of these are correct origins.
A
Correct answer
Explanation
Fossil fuels are formed from the remains of ancient plants and animals buried under high pressure and temperature over millions of years; coal and petroleum are primary examples.
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power plant
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manufacturing plant
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refinery
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electric plant
C
Correct answer
Explanation
A refinery is an industrial facility where crude oil is processed and refined into usable products like gasoline, diesel, and heating oil.
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coal
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fossil fuel
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petroleum
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black tar
C
Correct answer
Explanation
Petroleum is the scientific and common term for crude oil, which is a liquid fossil fuel found underground.
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evaporation
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deposition
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condensation
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sublimation
A
Correct answer
Explanation
Combustion of fossil fuels releases carbon stored in the ground into the atmosphere as carbon dioxide, which is a primary driver of the greenhouse effect.
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cloud
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sink
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holding pattern
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reservoir
D
Correct answer
Explanation
A carbon reservoir (or pool) is a place where carbon is stored for a period of time, such as the ocean, the atmosphere, or fossil fuel deposits.
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light bulbs
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drinks cans
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lubricant
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cooking
C
Correct answer
Explanation
Graphite is used as a dry lubricant because its layers are held together by weak intermolecular forces, allowing them to slide over one another easily.