Question

The carbon atom in co2 shares _______blank electron pairs. after the reaction with h2o to form h2co3 is completed, the carbon atom shares ________blank electron pairs. question 4 choices choice
a., two; two choice
b., four; four choice
c., two; three choice
d., three; two

Answer 1

B , four , four ........

Answer 2

Answer:

b., four; four

Explanation:

As an element, carbon is tetravalent, it has 4 outer shell electrons and oxygen has 6 outer shell electrons. The carbon dioxide molecule is formed from one carbon atom and two oxygen atoms by two double covalent bonds. In making CO₂, two electrons of carbon share with each oxygen atoms resulting in 4 bonding electrons in total. Carbon dioxide's strong double bonds make it very stable.

In reaction with water, carbon forms double covalent bond with one of the oxygen of CO₂ and with two single covalent bonds one with other oxygen atoms of CO₂ and one with the oxygen atom of H₂O forming carbonic acid (H₂CO₃). Thus, carbon shares 4 electrons.