Crystallization Conditions and Packing Patterns

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What is the term used to describe different packing patterns of molecules in crystals?

Enantiomers

Stereoisomers

Polymorphic forms (correct)

Isomers

How are the two packing arrangements in Fig. 8.1 described in the text?

Enantiomers

Crystals with the same density

Polymorphic forms (correct)

Isomers

Why would the structure in Fig. 8.1a have a lower melting point than the structure in Fig. 8.1b?

It has more spaced out molecules (correct)

It has a more interwoven structure

It has natural break lines

It is more difficult to physically pull molecules off the structure

What would be the consequence of an attempt to mill the crystal structures in Fig. 8.1a and Fig. 8.1b?

Fig. 8.1a will break easily, Fig. 8.1b might not Signup and view all the answers

What term is used to describe crystals with the same mass of material occupying different volumes?

Polymorphic forms Signup and view all the answers

What term describes crystals with different packing patterns due to a change in crystallization conditions?

Polymorphic forms Signup and view all the answers

Why would the crystal structure in Fig. 8.1a have a lower melting point than the structure in Fig. 8.1b?

The molecules in Fig. 8.1a are more spaced out than those in Fig. 8.1b Signup and view all the answers

What might be the consequence of an attempt to mill the crystal structures in Fig. 8.1a and Fig. 8.1b?

Only the structure in Fig. 8.1a would break easily due to natural break lines Signup and view all the answers

What change in crystallization conditions could lead to molecules forming crystals with a different packing pattern?

A shift to a different solvent during crystallization Signup and view all the answers

What term is used to describe crystals with the same mass of material occupying different volumes?

Polymorphic forms Signup and view all the answers

Match the following with their descriptions:

Packing arrangements in Fig. 8.1a and Fig. 8.1b = Two crystal forms called polymorphic forms Molecules in Fig. 8.1a and Fig. 8.1b = More spaced out in Fig. 8.1a and more interwoven in Fig. 8.1b Melting point of the structure in Fig. 8.1a = Lower than the structure in Fig. 8.1b Consequence of an attempt to mill the crystal structures in Fig. 8.1a and Fig. 8.1b = Structure in Fig. 8.1a would break easily, whereas the structure in Fig. 8.1b may not break easily Signup and view all the answers

Crystallization Conditions and Packing Patterns

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Questions and Answers

What is the term used to describe different packing patterns of molecules in crystals?

How are the two packing arrangements in Fig. 8.1 described in the text?

Why would the structure in Fig. 8.1a have a lower melting point than the structure in Fig. 8.1b?

What would be the consequence of an attempt to mill the crystal structures in Fig. 8.1a and Fig. 8.1b?

What term is used to describe crystals with the same mass of material occupying different volumes?

What term describes crystals with different packing patterns due to a change in crystallization conditions?

Why would the crystal structure in Fig. 8.1a have a lower melting point than the structure in Fig. 8.1b?

What might be the consequence of an attempt to mill the crystal structures in Fig. 8.1a and Fig. 8.1b?

What change in crystallization conditions could lead to molecules forming crystals with a different packing pattern?

What term is used to describe crystals with the same mass of material occupying different volumes?

Match the following with their descriptions:

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