AnswersTN-Physical Science SC 26-27 For CreditLab: Charles's Law

Lab: Boyle’s Law Answers

19 verified answers
1
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of the gas and measured the:pressure
Selection 2:volume.
2
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To answer this question, you used weight to change the ✔ pressuresolubilitytemperature of the gas and measured the

Answers:
of the gas and measured the:pressure
Selection 2:volume.
3

resulting changes to the gas’s pressure.✔ volume.weight.

A
pressure.
B
✔ volume.
C
weight.
4

The amount of gas (in terms of moles, mass, and molecules) decreased✔ was constantfluctuated randomlyincreased

A
decreased
B
✔ was constant
C
fluctuated randomly
D
increased
5

Based on Charles’sAvogadro’s✔ Boyle’sHess’s law, pressure and volume were expected to be inversely proportional.

A
Charles’s
B
Avogadro’s
C
✔ Boyle’s
D
Hess’s
6

Did the data support the hypothesis (above)? ✔ yessomewhatno

A
✔ yes
B
somewhat
C
no
7

Justify your answer.

Answer:

As weight was added to the syringe, the pressure on the trapped air increased and its volume decreased. Therefore, the data supported the hypothesis.

8

Sample Justification: As weight was added to the top of a syringe, the volume of the air trapped in the syringe decreased. The weight and the surface area of the plunger were used to calculate pressure. As more weight was added, the pressure increased. The volume decreased in response.

Answers:
Sample Justification: As weight was added to the top of a syringe, the volume of the air trapped in the syringe decreased. The weight and the surface area of the plunger were used to calculate pressur:yes
Sample Justification: As weight was added to the top of a syringe, the volume of the air trapped in the syringe decreased. The weight and the surface area of the plunger were used to calculate pressur:yes
9

Sample Justification: As weight was added to the top of a syringe, the volume of the air trapped in the syringe decreased. The weight and the surface area of the plunger were used to calculate pressure. As more weight was added, the pressure increased. The volume decreased in response.

Answers:
Sample Justification: As weight was added to the top of a syringe, the volume of the air trapped in the syringe decreased. The weight and the surface area of the plunger were used to calculate pressur:yes
Sample Justification: As weight was added to the top of a syringe, the volume of the air trapped in the syringe decreased. The weight and the surface area of the plunger were used to calculate pressur:yes
10

Look back at your data and your regression equation. (Sample data is shown to the right, with x = pressure and y = volume.) Check all statements that are true.

A
As the pressure of the gas increased, the volume of the gas decreased.
B
For all pairs of data of pressure and volume, P • V was appoximately the same.
C
For all pairs of data of pressure and volume, P • V k for the same value k.
Option C
D
The regression equation was of the form V = kP–1 (which is the same as V = k/P).
11

A student doing this experiment obtained the data shown in the table above. The value of the constant, k, for this data is 0.0425.750.0✔ 51.5

A
0.04
B
25.7
C
50.0
D
✔ 51.5
12

Since P • V was the same for all pressures, this student’s data was inaccuraterandom✔ accurate

A
inaccurate
B
random
C
✔ accurate
13

Suppose that the student took one more volume reading of 24.2 mL but forgot to measure the pressure. Compute the pressure expected for that volume. 1.221.47✔ 2.134.26 kg/cm²

A
1.22
B
1.47
C
✔ 2.13
D
4.26
14

Check all actions that change the constant k.

A
leaking air from the syringe
B
changing the number of gas molecules
C
changing the temperature
D
changing the pressure
E
changing the volume
15

Check all reasons why a syringe was a good choice of tool in this experiment.

A
It has volume markings that can be read.
B
It will not easily leak gas.
C
The volume can change.
16

Check all reasons why a book was used.

A
It increased pressure on the gas.
B
It supported additional weights.
C
It balanced the syringe.
17

You are trying to make balloon sculptures. You twist the balloons gently, but they keep popping. Besides trimming your nails, how could you you prevent that? Why will your strategy work?

Answer:

Inflate the balloons less and leave some uninflated space. That gives the air room to move when you twist the balloon, so the pressure rises less and the balloon is less likely to pop.

18

Did you suggest filling the balloons with less air, thereby decreasing the pressure? yesnosort of

A
yes
B
no
C
sort of
19

Air pressure is lower at high altitudes. An airplane cabin can adjust, but as the plane rises, passengers can experience temporary pain in their ears. Check all facts below that explain why.

A
The air pressure in the ears increases.
B
The air pressure in the ears decreases.
C
The volume of air in the ears increases.
D
The volume of air in the ears decreases.
E
The change in volume causes discomfort.
F
It takes time for the ears to dispell excess air past the ear drum.

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