A(n) is an organic compound in which a carbonyl group is bonded to two different carbon atoms.

Answer : A Ketone is an organic compound in which a carbonyl group is bonded to two different carbon atoms.

Explanation :

A Ketone is an organic compound having a structure where R and R' can be different carbon containing substituents.

Ketone is a compound in which the a carbonyl group is bonded to the two different carbon atoms which are R and R' and there is a double bond present between the carbon and oxygen atom.

Some examples of ketones are, acetone, propanone, butanone, etc.

Hence, a Ketone is an organic compound in which a carbonyl group is bonded to two different carbon atoms.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

it would be b. 6co2 + 6h2o --> c6h12o6 + 6o2