Question

1. how can you grow crystals from a liquid?

• heat the liquid
• cool the liquid
• boil the liquid
• bubble gas into the liquid.

1. which type of crystal structure is most workable?

• many slip planes, little empty space
• many slip planes, lots of empty space
• few slip planes, little empty space
• few slip planes, lots of empty space

1. which crystal structure has the most slip planes?

• simple cubic
• bcc
• fcc
• hcp

Explanation:

Question 49

To grow crystals from a liquid, cooling the liquid (e.g., a solution) reduces the solubility of the solute, causing it to precipitate and form crystals. Heating, boiling, or bubbling gas don't promote crystallization in this way.

A workable (ductile) crystal structure has many slip planes (for easy deformation) and little empty space (to prevent brittle fracture from voids). Lots of empty space or few slip planes reduce workability.

Face - centered cubic (FCC) crystal structure has the most slip planes among simple cubic, BCC, FCC, and HCP. FCC has more close - packed planes available for slip compared to the others.

Answer:

B. cool the liquid

Question 50