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Questions and Answers
What is the main difference between amorphous substances and crystals other than cubic?
What is the main difference between amorphous substances and crystals other than cubic?
- Amorphous substances have higher refractive index than non-cubic crystals.
- Amorphous substances are isotropic while non-cubic crystals are anisotropic. (correct)
- Amorphous substances have lower melting points than non-cubic crystals.
- Amorphous substances exhibit different properties in various directions while non-cubic crystals do not.
What happens to beeswax and paraffin when heated then cooled slowly?
What happens to beeswax and paraffin when heated then cooled slowly?
- They remain amorphous.
- They become liquid.
- They assume crystalline arrangements. (correct)
- Their refractive index changes.
How does the polymorphic form of Novobiocin affect its therapeutic activity?
How does the polymorphic form of Novobiocin affect its therapeutic activity?
- The amorphous form is poorly absorbed but therapeutically active. (correct)
- The amorphous form is poorly absorbed and has no activity.
- Both forms have similar therapeutic effects.
- The crystalline form is more readily absorbed and therapeutically active.
What constitutes the liquid crystalline state or mesophase?
What constitutes the liquid crystalline state or mesophase?
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Which state allows molecules to be mobile in three axes perpendicular to each other?
Which state allows molecules to be mobile in three axes perpendicular to each other?
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