Chapter 3-5 Student Chemistry Worksheet - Class X, Central Board Of Secondary Education Page 5
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30Formative Assessment Manual for Teachers
Carbon and its Compounds - Chapter 4
Carbon and its Compounds
Chapter 4
Assessment technique: Content based worksheet
Objectives: To enable students to-:
●
Learn that ethyl alcohol is a major component of wine.
●
Learn that vinegar is 5-8 % solution of ethanoic acid.
●
Understand that ethanol is oxidized to ethanoic acid on heating with Alkaline KMnO
4
or acidified Potassium dichromate.
●
To correlate the given facts about an organic compound to solve a problem identification
of unknown compound
Task:
Individual
Proc:edure: The following worksheet may be given to the students after a teaching-learning
episode on chemical and physical properties of ethanol and vinegar.
Teachers may give the following information to the students as a recall before giving them the
worksheet -
CH
OH is a major component of wine.
●
CH
3
2
●
Alcohols on oxidation with Alkaline KMnO
or acidified Potassium dichromate are
4
converted to carboxylic acids.
●
Example: CH
CH
OH
CH
COOH
3
2
3
●
Vinegar is 5-8% solution of ethanoic acid, it is widely used as a preservative in pickles.
Stupent Worksheet
Time = 10 min
Study the given problem carefully and answer the following questions:
Problem-
An organic compound A (C
H
O
) is a constituent of wine. This compound, on heating with alkaline
2
4
2
potassium permanganate gets oxidised to, give, another compound B which turns blue litmus red.
Q1. Identify compound A. Write down its chemical name and chemical formula.
Chemical name___________________________________________________
Chemical formula___________________________________________________
35
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