9) A balloon is filled with helium gas, which is lighter than air. Which of the

Question

9) A balloon is filled with helium gas, which is lighter than air. Which of the diagrams (A, B, or C) shows the new volume of the balloon when the following changes are made? Initial A B volume a. The balloon floats to a higher altitude where the outside pressure is lower, but the temperature is the same. b. The balloon is placed in a hyperbaric chamber where the pressure is C. The temperature of the balloon changes from 5 °C to 40°C at constant d. The balloon is warmed and then cooled to its initial temperature and the increased, but the temperature stays the same. pressure. pressure remains the same. 10) The structures and boiling points of cyclopentane and tetrahydrofuran are shown in the following figure. Explain why the boiling point of tetrahydrofuran is higher than that of cyclopentane. Boiling point 49 °C 65 C 11) Draw a cartoon model of the cell membrane. Incorporate the following components in your model and label them: a) Phospholipid bilayer b) Inside the cell (Cytosol)

Explanation / Answer

0)

9)
a)
P increases.
So, V decreases according to Boyle’s law (P*V = constant)
Answer: A

b)
P decreases.
So, V increases according to Boyle’s law (P*V = constant)
Answer: C

c)
T increases. Since V/T is constant. So, V increases
Answer: C

d)
Since nothing changes. volume will be same
Answer: B

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