2. Name of the teacher: Rajalekshmi.G Standard: X
Name of the school: DVNSSHSS Strength: 35
Subject: Chemistry Duration: 40 min
Unit: The Gaseous State Date: 4.8.2014
Topic: Charles law Age: 13+
CURRICULAR STATEMENT
To get an awareness about the concept “Charles law” through observation,
discussion and experimentation by questioning, participation in practical work and group
discussion.
3. CONTENT ANALYSIS
Terms : Charles law
Facts
Gas laws explain the relationship between the properties of gases like pressure,
temperature and volume
When the temperature increases the volume of gas increases
When the temperature decreases the volume of gas also decreases
When the value of volume and temperature changes , the constant value become also
changes
Relation of Charles law is volume is directly proportional to temperature
Equation of Charles law is V1/T1 =V2/T2
The scientist who proposed the law by Jacques Alexandre Charles
Concepts:
Minor concept
Volume of a gas is directly proportional to its temperature in Kelvin scale
Major concept
CHARLES’ LAW
At constant pressure the volume of fixed mass of gas is directly proportional to temperature in
Kelvin scale.
According to Charles law
V α (to+273) | (at constant mass, pressure)
Or
V α T
Where, T=(to+273) the temperature in Kelvin scale
V= a constant x T
V/T = a constant
Let the volume of fixed mass of gas to be V1 at temperature T1 keeping the pressure constant if
temperature is changed to T2. The volume becomes V2.Then according to Charles law
V1/T1 = constant and V2/T2 = constant, therefore it can be written as,
V1/T1=V2/T2
4. LAW:
Charles’ law
At constant pressure, the volume of fixed mass of gas is directly proportional to
temperature in Kelvin scale
According to Charles law,
LEARNING OUTCOMES
Enables the pupil to develop
Remembering
V1/T1=V2/T2
a) Recalling various possibilities of usuage of balloo
b) Recognize the condition stated in Charles law
c) Remembering the relation between volume and temperature.
Understanding
a) Explaining the concept of Charles law
b) Illustrating Charles law with suitable examples
c) Extrapolating the concept of Charles law.
Applying
a) Appling the ideas attained about Charles law into another familiar situation
b) Implementing the concept of Charles law.
Analyzing
a) Focusing the idea, temperature is directly proportional to volume
b) Distinguishing the law stated by Charles
5. Evaluating
a) Co coordinating the relation between volume and temperature
b) Evaluating the concept of Charles law
Creating
a) Designing an experimental setup to show Charles law
b) Hypothesizing the reason behind the relation between pressure, temperature and volume
Scientific attitude
Developing curiosity by observing experiments related to inertia
Process skills
The pupil develop process skills like, observing the experiments showing Charles law.
Experimenting skills through doing various experiments related to Charles law. Classifying the
graphical representation on the basis of the law
Prerequisites
Pupils known about the terms volume, pressure and temperature
Teaching learning resources
Show power point presentation including
Picture of Jacques Alexandre Charles
Life sketch of Jacques Alexandre Charles
Definition of Charles law
Graphical representation of law
Pictorial representation of laws
References
1) Text book of 10th standard by SCERT
2) Teachers hand book
6. Classroom interaction procedure Expected pupil responds
Preparation
Teacher begins the class with a friendly talk with pupil.
Showing the picture below teacher asking the students to
observe it keenly.
What things do you observe in the burner, piston in the
figure?
Is the arrangement of molecules in both piston are same?
Which piston has attached with higher temperature?
What is the reason behind this?
Today in this class we are going to study about this effect
in detail.
Presentation
Teacher divided the students into small groups
Activity 1
Teacher distribute agarbathi to each group and instruct
that checkout the intense of smells after that each group
has burns the
Agarbathi.
Discussion points:
What happens to the smell of agarbathi burned?
Is it same the smell of agarbathi before and after burning?
What is the reason behind this?
No, it is not same
Second piston
Burning causes the rise in
temperature
Smell increased.
It is not same smell.
Burning take place,
temperature increases
7. Generalization:
When temperature increases the smell of the agarbathi
also increases. This due to change in volume at high
temperature.
Activity 2
Teacher showing a graphical representation and asked
the students to observe it and note the observation in
your science diary
Discussion points:
By observing the graph, what about Temperature and
volume ?
What is the volume at -273° C?
What is the lowest temperature attainable by gas?
How to convert degree Celsius to Kelvin scale?
Generalization:
When temperature increases volume decreases. The
Volume at -273°c is zero. The lowest temperature
attainable by the gas is 273°c. We can convert degree
Celsius to Kelvin scale by the equation T°c+273.
Activity 3
The teacher shows the following pictures to the students
and explains the concepts in each picture.
T increases V decreases
Zero
273° C
T° C+273
11. Review question
1. Define Charles law?
2. What is the relationship between volume and temperature on the basis of Charles law?
3. Illustrate the graphical representation of Charles law?
4. Write down the equation of Charles law?
5. How to convert the temperature in degree?
Follow up activities
The volume of a gas at a certain pressure is 450mL at 270C. At what temperature will its volume
be reduced to 300mL, at the same pressure?
