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AP Chemistry 4.4 Physical and Chemical Changes Question Bank

Practise AP Chemistry 4.4 questions by connecting macroscopic observations such as pressure and phase with particle-level changes.

Syllabus
Effective Fall 2024
Course
AP Chemistry

Exam points

  • explain whether a process is physical or chemical from phase, mass and covalent-bond evidence

Covered syllabus points

4.4.A—Explain the relationship between macroscopic characteristics and bond interactions for: i. Chemical processes.…

4.4 Physical and Chemical Changes question 1

[Maximum number: 1]

Questions 14-17 refer to the following information.

Questions 14-17 refer to the following information.

Questions 14-17 refer to the following information.

Equimolar samples of CH3OH(l)\mathrm{CH}_{3} \mathrm{OH}(l) and C2H5OH(l)\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}(l) are placed in separate, previously evacuated, rigid 2.0 L vessels. Each vessel is attached to a pressure gauge, and the temperatures are kept at 300 K. In both vessels, liquid is observed to remain present at the bottom of the container at all times. The change in pressure inside the vessel containing CH3OH(l)\mathrm{CH}_{3} \mathrm{OH}(l) is shown below.

Figure for Question 4.4 Physical and Chemical Changes question 1 — AP Chemistry

14. Which of the following best describes the change that takes place immediately after the CH3OH(l)\mathrm{CH}_{3} \mathrm{OH}(l) is introduced into the previously evacuated vessel?

A

A chemical change takes place because covalent bonds are broken.

B

A chemical change takes place because intermolecular attractions are overcome.

C

A physical change takes place because covalent bonds are broken.

D

A physical change takes place because intermolecular attractions are overcome.

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