For Each of the Following, Indicate Whether a Physical or Chemical

question 36

Short Answer

For each of the following, indicate whether a physical or chemical change occurs.
A)Mercury(II) oxide is heated and forms mercury metal (Hg) and oxygen gas (O₂).
B)Liquid mercury is cooled to -40 $\degree$ C, at which point it solidifies.
C)A glowing match is thrust into hot oxygen gas and bursts into flame.
D)Water vapor condenses on a cool surface.

• A)Mercury(II) oxide is heated and forms mercury metal (Hg) and oxygen gas (O₂).
• B)Liquid mercury is cooled to -40 \(\degree\)C, at which point it solidifies.
• C)A glowing match is thrust into hot oxygen gas and bursts into flame.
• D)Water vapor condenses on a cool surface.

---

Definitions:

Rapid Eye Movement (REM) Stage

A sleep phase marked by quick movements of the eyes, vivid dreams, and increased brain activity.

Sleep Disorders

A range of conditions that affect the ability to sleep well on a regular basis, impacting overall health and quality of life.

Infant Sleep Pattern

The typical periods of sleep and wakefulness observed in babies, which can vary greatly in duration and predictability.