The inside of a sphere ordinarily contains air (approximately 80% N2(g) and 20%

Question

The inside of a sphere ordinarily contains air (approximately 80% N2(g) and 20% O2(g)). What will be the effect of the following changes (next four multiple choice questions) on the results of the experiment to determine absolute zero relative to the experiment as described in the lab procedures? (To the following questions 1-4 that are bolded, Select the best answer from the list below.)

1. Air is replaced by He at atmospheric pressure (1.00 atm)

A. The slope of the pressure versus temperature slope will be the same and the absolute temperature determined will be the same.

B. The slope of the pressure versus temperature slope will be lower but the absolute temperature determined will be the same.

C. The slope of the pressure versus temperature slope will be higher but the absolute temperature determined will be the same.

D. The slope of the pressure versus temperature slope will be the same and the absolute temperature determined will be lower.

E. The slope of the pressure versus temperature slope will be the same and the absolute temperature determined will be higher.

2. The pressure in the sphere is increased from 1.00 atm to 2.00 atm.

A. The slope of the pressure versus temperature slope will be the same and the absolute temperature determined will be the same.

B. The slope of the pressure versus temperature slope will be lower but the absolute temperature determined will be the same.

C. The slope of the pressure versus temperature slope will be higher but the absolute temperature determined will be the same.

D. The slope of the pressure versus temperature slope will be the same and the absolute temperature determined will be lower.

E. The slope of the pressure versus temperature slope will be the same and the absolute temperature determined will be higher.

3. The pressure in the sphere is reduced from 1.00 atm to 0.50 atm?

A. The slope of the pressure versus temperature slope will be the same and the absolute temperature determined will be the same.

B. The slope of the pressure versus temperature slope will be lower but the absolute temperature determined will be the same.

C. The slope of the pressure versus temperature slope will be higher but the absolute temperature determined will be the same.

D. The slope of the pressure versus temperature slope will be the same and the absolute temperature determined will be lower.

E. The slope of the pressure versus temperature slope will be the same and the absolute temperature determined will be higher.

4. The sphere is reduced to one-half the size used in the experiment and the pressure is maintained at 1.00 atm?

A. The slope of the pressure versus temperature slope will be the same and the absolute temperature determined will be the same.

B. The slope of the pressure versus temperature slope will be lower but the absolute temperature determined will be the same.

C. The slope of the pressure versus temperature slope will be higher but the absolute temperature determined will be the same.

D. The slope of the pressure versus temperature slope will be the same and the absolute temperature determined will be lower.

E. The slope of the pressure versus temperature slope will be the same and the absolute temperature determined will be higher.

5. If a plot of Pressure (kPa) versus Temperature (oC) data for an experiment in this lab has an equation y = 0.342x +91.894 Calculate the absolute zero to three significant figures. (answer in degrees Celsius) Match the relationship of y to x in each of the following equations as directly proportional, inversely proportional or neither.

6. Answer

A. y is directly proportional to x

B. y is inversely proportional to x

C. Neither

1. y = x2

2. y= -x

3. y = x

4. y = 3.5x

5. y= 3.5x - 2

6. yx = 4, (x>0)

7. y = 1/x, (x>0)

8. y= x/5

Explanation / Answer

1. A, as pressure tempertaure curve is independent of the nature of the gas.

2. C, as pressure is directly proportional to temperature, so temperature will also increase with the same amount and hence slope will be higher but absolute temperature remain constant.

3. B, same reason as of A

4. C, because volume and pressure are inversely related to each other. As in this case, size of the sphere is decresed so air paticles faces more pressure and more temperature(due to kinetic collision of the air particles).

5. if we consider absolute zero is when pressure = zero

0 = 0.342X + 91.894
X = -91.894 / 0.342

X=269°C

X= 4K

6. B, y is inversely proportional to x i.e y=1/x, (x>0) we can check it by randomly putting any value of y and keeps it increasing we notice the a decrease in the value of x.

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