Answer:
a scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact.
When
Carboxylic Acid is treated with
Alcohols in the presence of
acid as a catalyst it produces corresponding
Esters. This reaction is called as
Esterification.
Also, this reaction is a reversible reaction and the ester formed can also hydrolyze to produce Carboxylic acid and Alcohol. This reverse reaction is called as
transesterification.
The formation of
Ethyl Acetate from
Acetic Acid and
Ethanol in the presence of acid is shown below,
Answer: The overall equation will be 
Explanation:
The representation is given by writing the anode on left hand side followed by its ion with its molar concentration. It is followed by a salt bridge. Then the cathodic ion with its molar concentration is written and then the cathode.
Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.
Anode : 
Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.
Cathode :

The number of electrons lost must be equal to the number of electrons gained , thus overall equation will be :

Answer:
5 Atoms
Explanation
We have one atom of Calcium, One Atom of Carbon and three of Oxygen
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