i Inan experiment a large excess of iodine is reacted with a small concentration of propanone in the presence of H"(aq). The concentration of propanone is measured at regular time intervals. What happens to the value of the half-life of the propanone concentration as the concentration of propanone decreases?
Classes Of Functional Groups
Organic Chemistry deals mostly with carbon and hydrogens, also called hydrocarbons, but those groups which replace hydrogen and bonds with carbon to give a characteristic nature, unique of their own, to the hydrocarbon they are attached to, are called functional groups. All the compounds belonging to a functional group undergo reactions in a similar pattern and are known to have similar physical and chemical properties.
Characteristics Of Functional Groups
In organic chemistry, we encounter a number of special substituent groups which are attached to the hydrocarbon backbone. These groups impart certain characteristics to the molecule of which it is a part of and thus, become the highlight of that particular molecule.
IUPAC Nomenclature
In Chemistry, IUPAC stands for International Union of Pure and Applied Chemistry which suggested a systematic naming approach for the organic and inorganic compounds, as in the beginning stage of nomenclature one single chemical compound was named in many ways by which lead to confusion. The need for this approach aroused as the number of chemical compounds newly discovered were increasing (approximately 32 million compounds) and the basic concept of nomenclature i.e. the trivial nomenclature and the derived system of nomenclature failed to overcome the challenge. It is an important task to name a chemical compound systematically and unambiguously which reduces lots of confusion about the newly reported compounds.
Answer following sub-parts only-
c(ii) , f
![3 The rate equation for the reaction between iodine and propanone is:
rate = k[CH,COCH, [H'] [LJ°
a State the order of reaction with respect to iodine.
b State the overall order of reaction.
ci What is meant by the term half-life?
ii Inan experiment a large excess of iodine is reacted with a small concentration of propanone in
the presence of H"(aq). The concentration of propanone is measured at regular time intervals.
What happens to the value of the half-life ofthe propanone concentration as the concentration
of propanone decreases?
d Copy the sketch graph. Plot additional points at 10-second intervals up to 50s. Join all the points with
a smooth curve.
10
20
30
40
50
60
Time/s
e Explain the term rate-determining step.
f Suggest a possible mechanism for the rate-determining step for the reaction between iodine
and propanone.
Tot
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