One Form of Silicon Carbide, SiC, Is an Extremely Hard $\degree$

question 157

Multiple Choice

One form of silicon carbide, SiC, is an extremely hard solid that melts at 2730 $\degree$ C and diffracts X-rays.What type of solid is this form of SiC?

• A)covalent network solid
• B)ionic solid
• C)molecular solid
• D)metallic solid
• E)None of these are correct.

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Definitions:

Sleep

A naturally recurring state of rest for the mind and body, characterized by altered consciousness, relatively inhibited sensory activity, and inhibition of nearly all voluntary muscles.

REM Sleep

A phase of sleep characterized by Rapid Eye Movement, during which the brain is highly active and dreams occur.

Nightmares

Distressing dreams that cause the sleeper to feel a range of uncomfortable emotions, such as fear or horror, upon waking.

Sleep Apnea

A sleep disorder characterized by pauses in breathing or periods of shallow breathing during sleep.