Combustion Flashcards
What is combustion?
Combustion is a chemical reaction that occurs when a substance reacts rapidly with oxygen, producing heat and light.
What are the two main types of combustion?
The two main types of combustion are complete combustion and incomplete combustion.
What is produced during complete combustion?
Complete combustion produces carbon dioxide and water.
What is produced during incomplete combustion?
Incomplete combustion produces carbon monoxide, soot, and water.
True or False: Incomplete combustion occurs when there is a limited supply of oxygen.
True
What are the products of burning hydrocarbons in complete combustion?
The products are carbon dioxide and water.
Fill in the blank: The general formula for alkanes is CnH__.
2n+2
What is the role of a catalyst in combustion?
A catalyst speeds up the rate of combustion without being consumed in the reaction.
Which gas is a common pollutant produced by incomplete combustion?
Carbon monoxide
What is the main environmental concern associated with combustion?
The release of greenhouse gases, particularly carbon dioxide.
True or False: Combustion reactions are exothermic.
True
What is the balanced equation for the complete combustion of methane (CH4)?
CH4 + 2 O2 → CO2 + 2 H2O
What is the difference between a fuel and an oxidizer?
A fuel is a substance that burns, while an oxidizer is a substance that provides oxygen for combustion.
Multiple Choice: Which of the following is NOT a product of combustion? A) Carbon dioxide B) Water C) Oxygen D) Carbon monoxide
C) Oxygen
What is the significance of the air-fuel ratio in combustion?
The air-fuel ratio determines whether combustion is complete or incomplete.
Fill in the blank: The process of burning fossil fuels contributes to _____ change.
climate
What is the main use of combustion in everyday life?
Combustion is used for energy production, such as in engines and heating.
What is one method to reduce emissions from combustion?
Using catalytic converters in vehicles.
True or False: All combustion reactions produce soot.
False
What is the formula for the combustion of ethane (C2H6)?
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
What type of combustion occurs in a candle flame?
Both complete and incomplete combustion can occur in a candle flame.
What is a byproduct of incomplete combustion that is harmful to health?
Carbon monoxide
Multiple Choice: Which of the following fuels is considered renewable? A) Coal B) Natural gas C) Ethanol D) Oil
C) Ethanol
What is the effect of combustion on air quality?
Combustion releases pollutants that can degrade air quality.
Fill in the blank: The enthalpy change during combustion is usually _____ (positive/negative).
negative
What is the main component of natural gas?
Methane (CH4)
True or False: Combustion can occur in the absence of oxygen.
False
What is the purpose of combustion in an internal combustion engine?
To convert chemical energy from fuel into mechanical energy.
What are hydrocarbons?
Hydrocarbons are organic compounds composed entirely of hydrogen and carbon.
Which type of combustion is more efficient?
Complete combustion is more efficient than incomplete combustion.
