AP Chemistry 4.4 Physical and Chemical Changes Question Bank

Practise AP Chemistry 4.4 questions by distinguishing phase changes from chemical reactions using mass, particles and bond changes.

Exam points

distinguish physical phase changes from chemical reactions using particles, mass and bond changes

[Maximum number: 1]

Questions 14-17 refer to the following information.

Equimolar samples of $\mathrm{CH}_{3} \mathrm{OH}(l)$ and $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}(l)$ 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 $\mathrm{CH}_{3} \mathrm{OH}(l)$ is shown below.

Figure for Question 4.4.A—Explain the relationship between macroscopic characteristics and bond interactions for: i. Chemical processes.… question 1 — AP Chemistry

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

A chemical change takes place because covalent bonds are broken.

A chemical change takes place because intermolecular attractions are overcome.

A physical change takes place because covalent bonds are broken.

A physical change takes place because intermolecular attractions are overcome.

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4.4.A—Explain the relationship between macroscopic characteristics and bond interactions for: i. Chemical processes.… question 1