Lesson Plan : GAS LAWS

Teacher Name:
 RAVI AYANOLI
Grade:
 Grade 9-10
Subject:
 Science

Topic:
 GAS LAWS
Content:
 CHARLE'S LAW AND BOYLE'S LAW
Goals:
 To enable the student to: (i) understand that at constant pressure, the volume of a given mass of gas is directly proportional to its absolute temperature. (ii) understand that at constant temperature, the pressure of a given mass of gas is inversely proportional to its volume. (iii) generalise objectives (i) and (ii)as Charle's law and Boyle's law respectively and to arrive at a mathematical relationship. (iv) To apply these relationships in problems
Objectives:
 After completing this unit the student will be able to: (i) understand the relation ship between temperature and pressure on volume of gases. (ii)solve problems based on Charle's law and Boyle's Law.
Materials:
 Materials: Pressure Sensor (Absolute) (CI-6532A), graph papers, hot plate Veterinary syringes, small marshmallows AV/Technology: Internet connection with laptop, projector and screen
Introduction:
 Teacher takes a bottle and cover its mouth with opening of a balloon. Keeping the bottle on the hotplate asking students to observe the balloon that slighly inflates. Asking the students to infer the relationship between temperature and volume of air in the bottle. Teacher takes a syringe, pulls the plunger maximum out, closes the end with one finger and pushes the plunger in with force. Asking the student to observe the volume and to infer the relationship between volume and pressure.
Development:
 Teacher heats an open can with little water in it. when vapors come out at large rate, teacher closes the can tightly with lid and plunge the can in water stored in the sink. the can crumples. Teacher gives the students a syringe and 3 small marshmallows. Instruct them to place the marshmallows in the syringe and replace the plunger. Push the plunger as far down as possible without squashing the marshmallows. Place one finger on the end of the syringe and pull the plunger out to the end of the syringe. Observe the marshmallows. Students will notice that they get larger, or expand. As the plunger is pulled out, the volume of air inside the syringe increases causing a drop in pressure. This can be seen by the expansion of the marshmallow. Next leave the plunger at the end of the syringe and place a finger on the other end. Push the plunger into the syringe and observe the marshmallows. Students will notice that they “shrink”. As the plunger is pushed into the syringe, the volume of air inside the syringe decreases, causing an increase in pressure. This can be seen by the shrinkage, of the marshmallows.
Practice:
 Students change the volume of air in a syringe 2 mL at a time and measure the change in pressure by using the pressure sensor, that results. Students determine the relationship between the two quantities by examining a graph of Volume vs. Pressure and a graph of Inverse Volume vs. Pressure.
Accommodations:
 Teacher asks the students to plot the following graphs by using the same values: P Vs PV and P Vs 1/V
Checking For Understanding:
 1. Explain, in your own words, the relationship between the pressure (P) and the volume (V) of a gas at a constant temperature (T) . 2. With reference to how particles behave explain why this relationship exists. 3. Explain, with an equation, the relationship between the pressure (P) and the volume (V) of a gas at a constant temperature (T). 4. With reference to how particles behave explain why this relationship exists. 5. Explain, in your own words, the relationship between the temperature (T) and the volume (V) of a gas at a constant pressure (P). 6. Explain, with an equation, the relationship between the temperature (T) and the volume (V) of a gas at a constant pressure (P)
Closure:
 Posing a question to the students whether we can combine the two laws as V á T and V á 1/P so as to get V á T/P from the web based activities
Evaluation:
 Students will be assessed using a demonstration that they must solve and correct individually.
Teacher Reflections:
 Great unit. I would have liked more demos.

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