Chapter 3-5 Student Chemistry Worksheet - Class X, Central Board Of Secondary Education Page 9
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30Formative Assessment Manual for Teachers
Carbon and its Compounds - Chapter 4
Task:
Individual
Procedure:
Teacher may give this worksheet to the students after, they have learnt to derive a general formula
for compounds with same functional groups. The following brief idea bout a Homologous series
may be given to the students.
●
A series of compounds with same functional group is called a Homologous series.
●
Each Homologous series can be given a General formula in which number of carbon
atom is denoted by n and then number of hydrogen is related to n. If any other hetro
element like ‘O’ (oxygen) is present in the compound, its number is also written as a
subscript. e.g. general formula of aekan series is CnH
2n + 2
●
If one knows the general formula of a Homologous series, the molecular formula of
members can be written. After the completion of the worksheet teacher may add other
significant information related to the concept.
Assessment Pararneters
Question 1:
carries 3 marks
Question 2:
6 carries 1 mark each
Question 7:
carries 2 marks.
Student Worksheet
Time: 15 minutes
Instructions:
Few pair of .organic compounds are given below:
A.
CH
OH & C
H
OH
3
2
5
B.
C
H
OH & C
H
OH
2
5
3
7
C.
C
H
OH & C
H
OH
3
7
4
9
Atomic mass : C = 12 u, H = 1 u, O = 16 u
Answer the following questions on the basis of above data.
Q1. Calculate the difference in formula and molecular masses in the pairs given above a, b,
and c.
For pair (a) Difference in formula:________; Difference in molecular mass:________
For pair (a) Difference in formula:________; Difference in molecular mass:________
For pair (a) Difference in formula:________; Difference in molecular mass:________
Q2. What is common in the above result?
39
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