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Which molecule contains eight bonding electrons? A CO2 B C2H4 C C3H6 D NH3 - CIE - A-Level Chemistry - Question 1 - 2022 - Paper 1

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Which molecule contains eight bonding electrons? A CO2 B C2H4 C C3H6 D NH3

Worked Solution & Example Answer:Which molecule contains eight bonding electrons? A CO2 B C2H4 C C3H6 D NH3 - CIE - A-Level Chemistry - Question 1 - 2022 - Paper 1

Step 1

Evaluate structure of CO2

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Answer

Carbon dioxide (CO2) consists of one carbon atom double-bonded to two oxygen atoms. The double bonds contribute a total of four bonding electrons, not eight.

Step 2

Evaluate structure of C2H4

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Answer

Ethylene (C2H4) has a double bond between the two carbon atoms and each carbon is bonded to two hydrogen atoms. This results in a total of six bonding electrons (four from the C=C double bond and two from the C-H bonds).

Step 3

Evaluate structure of C3H6

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Answer

Propene (C3H6) has a double bond between two carbon atoms and each of the three carbon atoms has hydrogen atoms bonded. This yields a total of eight bonding electrons (six from the C-H bonds plus two from the C=C bond).

Step 4

Evaluate structure of NH3

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Answer

Ammonia (NH3) consists of one nitrogen atom bonded to three hydrogen atoms, contributing three bonding electrons, which is less than eight.

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