Lesson Worksheet: Types of Work Chemistry • 10th Grade

In this worksheet, we will practice describing the mechanisms of pressure–volume and mechanical work in chemical and physical processes.

Q1:

If pure oxygen is stored in a gas syringe, the volume of the gas varies with temperature and pressure as illustrated in the diagram.

Under ultraviolet light, oxygen reacts reversibly to produce ozone gas (O3) according to the following equation:

3O2O23

The enthalpy change for this reaction is +285 kJ/mol. When a sample of oxygen in a gas syringe is irradiated with ultraviolet light at a constant temperature of 0C and pressure of 1.0 atm, the resulting equilibrium mixture half fills the gas syringe, as shown.

Under ultraviolet illumination, the temperature of the gas syringe is increased to 100C at a constant pressure of 1.0 atm. Which diagram could represent the gas syringe at equilibrium?

  • A
  • B
  • C
  • D

Under ultraviolet illumination, the pressure in the gas syringe is increased to 2.0 atm at a constant temperature of 0C. Which diagram could represent the gas syringe at equilibrium?

  • A
  • B
  • C
  • D

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