PEKA Physics Form 4
TITLE
:Experiment 4.2 : THE GAS LAWS – BOYLE’S LAW
INSTRUMENT
:SCIENTIFIC INVESTIGATION EXPERIMENT REPORT
CHAPTER 4 : Heat
INSTRUCTION: 1. Prepare a report with the procedures for an Investigative Scientific Experiment from the stimulus shown in the diagram. 2. Carry out the experiment in the lab to collect and record the data then interpret the data and make a conclusion. 3. Write a task report STIMULUS:
Amin is pumping air into his bicycle’s tyre. After a few minutes, he finds that he’s getting difficulty to push the piston downward. APPARATUS : Glass syringe, a short rubber tube and Bourdon gauge PROCEDURE :
1. The apparatus is set up as shown in the diagram above. 2. The piston of the syringe is adjusted until the volume of air, V, in the syringe is 100 cm3 at atmospheric pressure. 3. The syringe is connected to a Bourdon gauge and the pressure of the air, P, in the syringe is observed and recorded. 4. The piston is then pushed in so that the volume of air trapped is 90 cm 3. The pressure is again recorded, this procedure is repeated for enclosed volumes of 80cm 3, 70 cm3 and 60 cm3. 5. The value of the volume of air, V , the pressure of the air, P and 1/ V are recorded. 6. The graph of pressure of the air, P against 1/ V is plotted. DISCUSSION: 1. Determine the gradient of the graph of pressure, P against 1/V . 2. Based on your graph, determine the pressure, P when the volume, V is 75 cm3. 3. The above experiment can be explained by a Boyle’s law. State Boyle’s law. Task Report Format: 1. Date 8. Arrangement of the apparatus . 2. Title 9. The procedure of the experiment. 3. Aim of the experiment. 10.Result 4. Inference 11.Graph 5. Hypothesis 12.Discussion. 6. Variables in the experiment 13.Conclusion 7. Apparatus and Materials 14.Precaution SKEMA : Experiment 4.2 : THE GAS LAWS – BOYLE’S LAW
PEKA Physics Form 4
1 2 3 4
CI PI 1 (PART 1) CI PI 2 (PART 1) CI PI 3 (PART 1) CI PI 4 (PART 1)
Inference
: The pressure of the gas depends on the volume.
Hypothesis
: When the volume increase , the pressure is decrease.
CI PI 1 (PART 2) CI PI 2 (PART 2)
Apparatus and Materials:
CI PI 3 (PART 2)
The procedure of the experiment. 1. The apparatus is set up as shown in the diagram above. 2. The piston of the syringe is adjusted until the volume of air in the syringe is 100 cm3 at atmospheric pressure. 3. The syringe is connected to a Bourdon gauge and the pressure of the air in the syringe is observed and recorded. 4. The piston is then pushed in so that the volume of air trapped is 90 cm 3. The pressure is again recorded, this procedure is repeated for enclosed volumes of 80cm3, 70 cm3 and 60 cm3. 5. The value of the volume of air, V , the pressure of the air, P and 1/V are recorded. 6. The graph of pressure of the air, P against 1/V is plotted.
5 6 7
8 9 10
11
CHAPTER 4 : Heat
CI PI 4 (PART 2) CIII PI 1
Aim : To study the relationship between volume and pressure of the gas . Manipulated variable : Gas volume ,V Responding variable : Gas Pressure, P Constant (fixed) variable : Gas temperature, T or mass of gas, m
Arrangement of apparatus :
Tabulation of data: Volume V / cm3
1 V / cm-3
Pressure P / Nm-2
100 90 80 70 60
CIII PI 2 CIII PI 3 CIII PI 4 12
Glass syringe, a short rubber tube and Bourdon gauge
Analyse the data . CIV PI,P2,P3
1 V / cm-3 Graph: Title Pressure P / Nm-2 against 1 Label y-axis ; Pressure P / Nm-2 and x-axis ; V / cm-3
CIV P4 CIV P5
Discussion : 1. Gradient of the graph = …………….. Nm-2 cm3. 2. when the volume, V is 75 cm3, 1/V = P = ………….. Nm-2
CIV P6
Conclusion ; volume.
CIV P7
Precaution; 1. 2. perpendicularly
Pressure of a fixed mass of gas is inversely proportional to its The rubber tube was fixed tightly to prevent leakage. When taking the readings of volume and pressure,position the eye to avoid parallax error.
