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Physics Grade 10 Gas laws Isoprocesses Worksheet descriptors and solutions.docx
|
Learning Objective |
Success criteria |
Task Number |
Marks/ Total |
|
Recall and understand laws of ideal gas. Learn to solve problems mathematically involving ideal gases. |
Learners solve problems in volume, temperature and pressure change in an ideal gas from the worksheet. (Problems on the PPT) |
1
|
…. / 6
|
|
Use Charles laws to solve problems of an ideal gas. (Problems on the PPT) |
Students solve the problems on volume and temperature of ideal gases in closed containers (from the worksheet). |
2
7 |
…. / 4
|
Worksheet descriptors
Worksheet 1 Solutions
According to the graph y value is pressure and x value is temperature. The coefficient in front of the x shows the gradient of the line of best fit, and the value added is the y-intercept.
The students have 2 options to figure out the value of absolute zero:
1) To extrapolate the graph and identify it graphically (preferred way)!
2) To calculate it using equation
For the second we need to make an assumption that gas’ pressure approaches zero (that is impossible practically of course).
Worksheet 2 solutions
1) 
= 
(P1 = P2 = const)
V2 = V1·
V2 = 70·10-3 m3·(
)
V2 ≈ 34.6 L
2) 
= 
(P1 = P2 = const)
V2 = V1·
V2 = 4·10-3 m3·(
)
V2 ≈ 3.6 L
3) 
= 
(P1 = P2 = const)
V2 = V1·(
)·(
)
V2 = 2.3·10-3 m3·(
)·(
)
V2 ≈ 0.56 L
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