Chapter 3-5 Student Chemistry Worksheet - Class X, Central Board Of Secondary Education Page 15
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30Formative Assessment Manual for Teachers
Carbon and its Compounds - Chapter 4
Suggested Remediation:
●
Some students may not know the molecular formula of methane, ethane and propane,
teacher may give them the formula before asking to write the electron dot structures of
these compounds.
●
Some students may and it difficult to recollect the number of valence electrons in
carbon and hydrogen atom and their placement around the central atom for bond
formation. They may be helped by asking them to write the electronic configurations
of the elements to find the number of valence electrons and valiancy some students
may miss, a bond while counting different type of bonds.
●
They may be asked to be cautious while counting the number of bonds in case of
double and triple bonded compounds.
Carbon and its Compounds
Chapterh 4
Assessment Technique: Content based Assessment.
Objective: To enable the students to
●
Recall chemical properties of hydrocarbons, alcohols and carboxylic acids. Write
chemical equations for the organic reactions with main products formed during the
reaction.
●
Draw correlations between the type of functional group and the chemical properties of
organic compounds.
●
Recognise various reagents like -a reducing or an oxidising agent used in organic
reactions.
Task:
Individual
Procedure:
The following formative assessment sheet may be given to the students to assess their understanding
of the chemical properties shown by hydrocarbons, alcohols and carboxylic acids.
A revision of the following concepts may be done before the assessment.
●
Hydrocarbons burn, in oxygen to give carbon dioxide, water and heat.
●
Alcohol when heated with Alkaline KMnO
or acidified potassium dichromate, are
4
converted to carboxylic acid.
●
Unsaturated hydrocarbons add hydrogen in the presence of catalysts such as Palladium
or nickel to give saturated hydrocarbons.
●
In the presence of sunlight, saturated hydrocarbons undergo substitution reacting with
chlorine.
●
Alcohol react with sodium metal to form sodium alkoxide and hydrogen gas.
45
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