The Black, Granular Material That Fills a Dry Cell in a Common

question 105

Multiple Choice

The black, granular material that fills a dry cell in a common flashlight (between the carbon rod and the zinc shell) is manganese(II) oxide, MnO₂. The oxidation number of manganese in MnO₂ is

• A) +2.
• B) -2.
• C) +4.
• D) -4.

---

Definitions:

Morality

Guidelines distinguishing between what is considered ethical and unethical or correct and incorrect actions.

Frontal Lobe

The part of the brain located in the front of the skull, responsible for complex cognitive functions, such as thinking, planning, problem-solving, and emotions.

Limbic System

A complex system of nerves and networks in the brain, involved in basic emotions (such as fear and pleasure), drives (such as those for food and sex), and the formation of memories.

Cognitive Development

The process by which individuals learn and progress in their ability to think, understand, and process information as they grow.