Chemistry Fall Semester Exam Review

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What is a Lewis Dot Diagram?

Back

A Lewis Dot Diagram is a representation of the valence electrons of an atom, showing how they are arranged around the nucleus and how they bond with other atoms.

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What distinguishes metals from nonmetals in terms of Lewis Dot Diagrams?

Back

Metals typically have fewer valence electrons (1-3) and tend to lose them, while nonmetals have more (4-8) and tend to gain or share them.

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What safety procedures should be followed when using flames in a lab?

Back

Long hair should be tied back, and clothing made of natural fibers like cotton should be worn to reduce fire risk.

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What is the Electron Sea Model?

Back

The Electron Sea Model describes metallic bonding where electrons are delocalized and free to move, creating a 'sea' of electrons around positively charged metal ions.

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What should NOT be used if a student's clothing catches fire?

Back

Eyewash fountain should NOT be used; instead, a safety shower or fire blanket is appropriate.

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What is the purpose of a fire blanket in a lab?

Back

A fire blanket is used to smother flames on a person or object, cutting off the oxygen supply and extinguishing the fire.

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What is the significance of tying back long hair in a laboratory setting?

Back

Tying back long hair prevents it from catching fire or getting caught in equipment, ensuring safety during experiments.

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What are the characteristics of ionic bonds?

Back

Ionic bonds form between metals and nonmetals through the transfer of electrons, resulting in the formation of charged ions that attract each other.

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What is the Ball and Stick model?

Back

The Ball and Stick model is a molecular model that represents atoms as balls and chemical bonds as sticks, illustrating the geometry of molecules.

Front

What is the role of a safety shower in a laboratory?

Back

A safety shower is used to quickly rinse off chemicals from a person's body in case of spills or exposure.