Home / Assignment Help / Cecil writes the equation for the reaction of hydrogen and oxygen below. H2 + O2 → H2O Why does his teacher ask him to balance the equation by including the correct coefficients? A.to show that most molecules exist in pairs B.to show that most compounds exist in pairs C.to show that atoms are conserved in chemical reactions D,to show that atoms are created in chemical reactions

Cecil writes the equation for the reaction of hydrogen and oxygen below. H2 + O2 → H2O Why does his teacher ask him to balance the equation by including the correct coefficients? A.to show that most molecules exist in pairs B.to show that most compounds exist in pairs C.to show that atoms are conserved in chemical reactions D,to show that atoms are created in chemical reactions

Answer: The correct answer is Option D.

Explanation:

Lewis dot structures are the structures which represent the valance electrons of an element forming a compound. The electrons are represented as the dots.

In a compound, the bonded electrons are represented as a bond and lone pair of electrons are represented as dots.

In NH_2^- compound,

Electronic configuration of Nitrogen: 1s^22s^2p^3

Valence electrons in nitrogen = 5

Electronic configuration of hydrogen: 1s^1

Valence electrons in hydrogen = 1

In the given compound, bond pairs are 2 which means number of electrons bonded are 4.

Unbonded electrons left on nitrogen will be 3 and this compound has an extra electron because of the negative charge present on the compound. Hence, total unbonded electrons present on this compound will be 4.

Therefore, the lewis dot structure will be Option D.

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