Stoichiometry and Cars

The coefficients in a chemical equation represent the

• number of atoms in each compound in a reaction

• relative numbers of moles of reactants and products

• masses, in grams, of all reactants and products

• number of valence electrons involved in the reaction

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How does stoichiometry relate to the efficiency of a car engine?

• It determines the color of the car.

• It helps in calculating the optimal fuel-air ratio for combustion.

• It is used to design the car's exterior.

• It affects the car's speed limit.

What is the stoichiometric air-fuel ratio for gasoline engines?

In a combustion reaction within a car engine, which of the following is a product?

• Nitrogen gas

• Carbon dioxide

• Hydrogen gas

• Oxygen gas

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Why is it important to maintain a stoichiometric air-fuel ratio in car engines?

• To increase the car's weight

• To ensure complete combustion and reduce emissions

• To decrease the car's speed

• To change the car's color

Which component in a car engine monitors the air-fuel mixture to maintain stoichiometry?

• Alternator

• Oxygen sensor

• Radiator

• Battery

What happens if the air-fuel mixture in a car engine is too rich?

• The engine will overheat.

• The engine will produce more power.

• The engine will emit more pollutants.

• The engine will consume less fuel.

What is the role of a catalytic converter in relation to stoichiometry in cars?

• It changes the car's color.

• It converts harmful emissions into less harmful gases.

• It increases the car's speed.

• It reduces the car's weight.

How does stoichiometry help in reducing car emissions?

• By increasing the car's speed

• By optimizing the fuel-air ratio for complete combustion

• By changing the car's design

• By reducing the car's weight

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Which of the following is a consequence of an incorrect stoichiometric ratio in a car engine?

• Improved fuel efficiency

• Increased emissions

• Enhanced engine performance

• Reduced engine noise