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

question 28

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.

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Definitions:

System Reliability

The probability that a system or component will perform its required functions without failure under stated conditions for a specified period of time.

Components in Series

A configuration where components are connected end-to-end in such a way that the failure of one component results in the failure of the entire system.

System Reliability

The probability that a system, including all individual components and processes, will perform its required functions without failure under stated conditions for a specified period of time.

Four-Component Product

A product that is made up of four distinct parts or elements, requiring a detailed product and process design.