Choose the statements that accurately describe the Wittig reaction.

STRATEGY: Review the characteristics of the Wittig reaction. Consider the types of reactants involved, the type of transformation that occurs, and the types of products that result.

A. the product is an ylide
B. involves a ylide as a reactant/intermediate
C. results in a betaine intermediate
D. a ketone is a required reactant
E. a C=C bond becomes saturated

B. Involves a ylide as a reactant/intermediate  

C. Results in a betaine intermediate

Explanation:

The Wittig reaction is the reaction of an aldehyde or ketone with a triphenylphosphonium ylide to form an alkene.

A betaine intermediate is the precursor to an oxaphosphetane intermediate.

A. is wrong. The ylide is a reactant/intermediate.

D. is wrong. The reactant can be an aldehyde

E. is wrong. A C=O bond becomes a C=C bond.

electron microscopy and scanning tunneling microscopes gives us a greater understanding of atoms by being able to see the atom itself, and lets us see some atomic reactions.

explanation:

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.