How will you tell if crystals actually form in crystallography?

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Why is small molecule crystallography often simpler than protein or other macromolecule crystallography? a. The sample preparation is usually more facile b. Large molecules tend form mosaic crystals c. Macromolecular crystallography requires a synchrotron source to obtain high resolution data, while small molecules can be imaged in smaller setups d. All of the above

In a recrystallization, the crystals do not always form spontaneously after cooling, even though the solution is supersaturated. Which of the following will help crystals form? More than one answer may be correct.

1. Scrape the inside of the Erlenmeyer flask with a glass rod below the surface of the solvent.

2. Add a scrap of paper to nucleate the crystals.

3. Add some crystals of the compound you are trying to crystallize.

4. Add some crystals of any kind.

5. Scrape the outside of the Erlenmeyer flask with a glass rod.

Question 1

What is the main process that dominates what shape your crystals form?

Question 2