Chapter 3-5 Student Chemistry Worksheet - Class X, Central Board Of Secondary Education Page 7
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30Formative Assessment Manual for Teachers
Carbon and its Compounds - Chapter 4
●
Enhance their observation skill.
●
Correlate the occurrence of a chemical reaction to the evolution of sweet odour.
Task:
Individual
Procedure:
Teachers may perform activity no. 4.8 on page 73, of class X NCERT Science textbook and may
explain that —
●
Alcohols and carboxylic acid react in presence of acid catalyst to form esters and the
reaction is known as etherification.
●
The chemical reaction involved in the process is-
CH
COOH + CH
CH
OH
CH
COOC
H
3
3
2
3
2
5
●
The mixture is to be heated in a water bath as alcohol is inflammable.
●
Esters are sweet smelling compounds and are used in making perfumes and flavouring
agents.
Assessment criteria —
The teacher may mark the answers to the questions given in the worksheet by keeping a weight age
of 2 marks each for Q .l & Q.2 and 1 mark each for Q3 to Q8
Student Worksheet
Time: 10 min
On the basis of the activity performed, answer the following questions -
Ql. Name the two reactants taken.
(a) __________________________________
(b) __________________________________
Q2. Identify the functional group present in the two reactants.
(a) __________________________________
(b) __________________________________
Q3. Why is the reaction mixture heated on a water bath?
Q4. Mention one identification characteristic of the product formed.
37
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