Catalytic Converter- PISA Competency Based Question in Chemistry

 

                            PISA Competency Based Question in Chemistry

Catalytic Converter

Most modern cares are fitted with a catalytic converter that makes the exhaust fumes of the car less harmful to people and to the environment.

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About 90% of harmful gases are converted into less harmful ones. Here are some of the gases that go into the converter and how they come out of it.

Catalytic Converter

Question 1 : Catalytic Converter

Use the information in the diagram above to give an example of how the catalytic converter makes exhaust fumes less harmful.

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CATALYTIC CONVERTER SCORING 1

Full credit

·       The conversion of carbon monoxide or nitrogen oxides, to other compound is mentioned.

·       Carbon Monoxide is changed into carbon dioxide.

·       Nitrogen oxides are changed into nitrogen.

·       It changes harmful fumes into non-harmful fumes. E.g. CO into CO2 (90%).

·       Carbon dioxide and nitrogen are not as harmful as carbon monoxide and nitrogen oxides.

No credit

·       Other responses.

·       The gases become less harmful.

·       It purifies the carbon monoxide and nitrogen oxides.