Question

answer questions 5 through 9 by looking at the following triple point diagram

1. which area of temperature and pressure does this substance exist as a solid? (a) a (b) b (c) c (d) not enough information is provided
2. between - 105°c and 200°c with a pressure below 1 atm, this substance exists as a a) solid b) liquid c) gas d) all of them at the same time, solid liquid and gas
3. decreasing the volume of a substance will ____________ the pressure a) increases b) decrease c) not affect d) not enough information is provided

Explanation:

Step1: Recall phase - diagram knowledge

In a phase - diagram, the solid phase is typically at low temperatures and high pressures.

Step2: Analyze the regions

In the given phase - diagram, region C is at low temperatures and high pressures. So the substance exists as a solid in region C.

Step3: For question 6

At pressures below 1 atm and the given temperature range, we are in the gas - phase region of the phase - diagram.

Step4: For question 7

According to Boyle's law ($PV = k$, where $k$ is a constant for a given amount of gas at a constant temperature), decreasing the volume ($V$) of a gas will increase the pressure ($P$).

Answer:

1. (c) C
2. c) gas
3. a) Increases