What is combustion?

• A chemical reaction where a fuel burns in oxygen.

• A process of breaking down long-chain hydrocarbons.

• A reaction that absorbs heat energy from its surroundings.

• The conversion of carbon dioxide into oxygen.

What type of reaction is combustion?

• Endothermic

• Exothermic

• Neutral

• Catalytic

What are the products of complete combustion of a hydrocarbon fuel?

• Carbon monoxide and water

• Carbon and water

• Carbon dioxide and water

• Methane and oxygen

What condition leads to incomplete combustion?

• Excess oxygen

• Sufficient oxygen

• Insufficient oxygen

• High temperature

What happens to carbon during incomplete combustion of methane when carbon monoxide is formed?

• It is fully oxidized.

• It is partially oxidized.

• It is not oxidized.

• It is reduced.

When balancing the complete combustion equation for an alkane, how is the number of water molecules determined?

• It is equal to the number of carbon atoms in the alkane.

• It is double the number of carbon atoms in the alkane.

• It is half the number of hydrogen atoms in the alkane.

• It is equal to the number of oxygen molecules consumed.

What is the balanced coefficient for oxygen (O2) when butane (C4H10) undergoes incomplete combustion to produce carbon monoxide (CO) and water (H2O)?

• 4

• 4.5

• 5

• 9