Iron Exhibits Polymorphism,the Ability of a Solid Material to Exist $\circ$

question 80

Multiple Choice

Iron exhibits polymorphism,the ability of a solid material to exist in more than one crystal form.At low to moderate temperatures,it adopts a bcc structure; at temperatures above 913 ^$\circ$ C,an fcc structure.Silicon carbide also has polymorphs,including the wurtzite form with abab packing and the sphalerite form with abcabc packing.Which of the following statements is NOT correct?

• A)The bcc and fcc forms of iron probably have the same densities.
• B)The packing efficiency of iron atoms in the bcc form is lower than that of the fcc form.
• C)The two silicon carbide polymorphs probably have the same densities.
• D)The packing efficiencies of the two silicon polymorphs are probably the same.
• E)Both SiC polymorphs are based on hexagonal packing of atoms.

Gain knowledge on various approaches to decision making within task groups, including the advantages and disadvantages of each.

Recognize the concept and consequences of groupthink in decision-making processes.

Understand the concept and processes of empowerment and its significance in improving personal and societal conditions.

Recognize and differentiate between various forms of discrimination, oppression, and stereotypes.

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Definitions:

Acquaintances

Individuals one knows but with whom one is not particularly close, usually part of one's wider social circle.

Stress Resistance

The ability of an individual to withstand or manage stress without succumbing to its negative effects on mental and physical health.

Behavior Pattern

A recurrent way of acting by an individual or group towards a given object or in a given situation.

Hardiness

A personality trait characterized by resilience and the ability to endure difficult conditions.